Search

The objective of this work was to evaluate the quality of peach fruits of the cultivar BRS Kampai, refrigerated with intermittent temperatures during storage. The fruits were stored at a temperature of 1 ° C, with a relative humidity of 80-90% in a cold chamber. The treatments used were T1: fruits stored at 1 ± 0.5 ° C, T2: fruits stored at 1 ± 0.5 ° C, with heating every five days at 25 ° C, and T3: fruits stored at 1 ± 0.5 ° C, with heating every seven days at 25 ° C. Heating was carried out by removing the fruits from the cold chamber and keeping them in an air-conditioned room. The evaluations were carried out at the time of harvest, at 10 of cold storage plus 2 days of commercial simulation at 25ºC (10 + 2) and at 20 days of cold storage plus 2 days of commercial simulation at 25 ºC (20 + 2). Peaches were evaluated for weight loss, pulp firmness, soluble solids, titratable acidity, pH and skin color. It was observed a greater loss of mass and soluble solids content at T1, as well as greater pulp firmness at 20 days. T2 provided less mass loss compared to other treatments at 20 days. However, there was a greater loss of firmness of the pulp in this treatment in the same period. The use of intermittent temperatures in the storage of BRS Kampai peaches can be an alternative to prolong its post-harvest period. This study aimed at evaluating the quality of peaches borne by the cultivar BRS Kampai when cooled at intermittent temperatures throughout storage. They were stored at 1°C and relative humidity between 80% and 90% in a cold storage chamber. The following treatments were applied: T1 - fruit stored at 1±0.5°C; T2 - fruit stored at 1±0.5°C and increase in temperature every five days to 25°C; and T3 - fruit stored at 1±0.5°C and increase in temperature every seven days to 25°C. Fruit were submitted to increase in temperature when they were withdrawn from the cold storage chamber and kept in a heated room. Evaluations were conducted when fruit were harvested, after 10 cold storage days and 2 days of commercialization simulation at 25ºC (10+2) and after 20 cold storage days and 2 days of commercialization simulation at 25ºC (20+2). Peaches were evaluated in terms of mass loss, pulp firmness, soluble solids, titratable acidity, pH and epidermis color. T1 exhibited higher mass loss, higher soluble solid content and higher pulp firmness after 20 cold storage days, by comparison with the other treatments. T2 led to lower mass loss after 20 cold storage days than the ones of the other treatments. However, T2 also showed higher loss of pulp firmness in the same period. The use of intermittent temperatures throughout storage of ‘BRS Kampai’ peaches may be an alternative to extend their post-harvest period.

This study aimed at evaluating the use of phytoregulators in vegetative characteristics of ‘Packham’s Triumph’ pear trees in both 2014/2015 and 2015/2016 cycles. The orchard, was implemented in 2011. The following phytoregulators and doses were used: Ethephon and 6-Benzyladenine at 100, 200, 300 and 400 ml L-1. The experiment had a randomized block design with five replicates. Each experimental unit was composed of a plant. Variables under evaluation were leaf area, annual branch length, annual branch diameter, number of buds on the annual branch, internode length, fertility index and trunk cross section areas of the crown cultivar and of the rootstock. Only the following variables exhibited significance: leaf area, annual branch length and number of buds in plants treated with Ethephon in the 2015/2016 cycle. Leaf area was smaller when high concentrations of Ethephon were applied while the least efficient doses for annual branch length and number of buds were 162.66 ml L-1 and 107.30 ml L-1, respectively

'Esmeralda' is an orange fleshed peach cultivar primarily used for juice extraction and secondarily used for the fresh fruit market. Fruit yield and quality depend on several local environmental and managerial factors, mainly on nitrogen, which must be balanced with other nutrients. Similar to other perennial crops, peach trees show carryover effects of carbohydrates and nutrients and of nutrients stored in their tissues. The aims of the present study are (i) to identify the major sources of seasonal variability in fruit yield and qu Fruit Tree Department of Federal University of Pelotas (UFPEL), Pelotas 96010610ality; and (ii) to establish the N dose and the internal nutrient balance to reach high fruit yield and quality. The experiment was conducted from 2014 to 2017 in Southern Brazil and it followed five N treatments (0, 40, 80, 120 and 160 kg N ha

Fast ripening of fruits is one of the main hindrances to peach preservation. Even though the use of cold storage has extended commercialization periods, fruit quality is affected during storage. This study aimed at evaluating the influence of application of salicylic acid (SA) during cold storage, followed by commercialization simulation, regarding physical and chemical characteristics of ?BRS Kampai? peaches, which were harvested in the 2017 crop. The experiment was conducted in a completely randomized factorial design (4×3: SA concentrations × storage days), with four replications of ten fruits each. SA was applied at the following concentrations: 0, 2, 4 and 6 mM. Afterwards, fruits were submitted to cold storage at 1±0.5ºC and 80-85% relative humidity. Analyses were carried out on harvest day, on the 10th cold storage day, followed by a day at room temperature (20ºC) and on the 20th cold storage day, followed by a day at room temperature. Fruits were evaluated in terms of their mass loss, epidermis color, chromatic hue, pulp firmness, soluble solids (SS), pH and titratable acidity (TA). Both application of SA and cold storage contributed to decrease mass loss and TA, besides increasing the SS/TA relation. Fruits which were stored for 20 days and kept at room temperature for a day exhibited the highest values of SS and the lowest values of both brightness and pulp firmness. SA was efficient to maintain the quality of ?BRS Kampai? peaches submitted to cold storage for 10 and 20 days and an extra day of commercialization simulation. Made available in DSpace on 2022-03-16T07:06:02Z (GMT). No. of bitstreams: 1 Artigo-Effect-of-salicylic-acid-in.pdf: 799617 bytes, checksum: c5fe044f905e9a7f7c816f0e6fe743f2 (MD5) Previous issue date: 2021

Potassium (K) fertilization may affect peach quality and preservation. This study aimed at evaluating the effect of doses of K on physico-chemical and functional characteristics of "Sensação" peaches in the postharvest period. Mass loss, pulp color, total solublesolids, titratable acidity, pH, pulp and skin firmness, total concentrations of phenolic compounds and carotenoids and antioxidant activity were evaluated in fruits. The experiment was a randomized block design in a 5x3 factorial scheme, five doses of fertilizers (0, 40, 80, 120 and 160 Kg ha-1K2O) and three storage periods (harvest day, 10 days and 20 days in cold storage at 1±1ºC, followed by a day of simulated commercialization at 20±1ºC). Mass loss, pulp firmness, phenolic compounds, antioxidant activity and carotenoids decreased when fruit underwent cold storage, independent of the dosage of K fertilization. Doses of40 and160 kg ha-1K2O applied to the soil lead to a larger number of phenolic compoundsand higher antioxidant activity in fruits at harvest time. After cold storage, fertilization with160 kg ha-1K2O exhibited the highest antioxidant activity and the lowest mass loss in fruits. Increase in doses of K strengthened the color of peach pulp. Made available in DSpace on 2021-04-16T17:35:55Z (GMT). No. of bitstreams: 1 barreto-15-3-2021-319-324.pdf: 946731 bytes, checksum: 21c760837ace5c819da8c39831554d99 (MD5) Previous issue date: 2021

Fruits that go through processes of sanitation, peeling, cuttingand packaging,to be consumed soon afterwards, are called minimally processed fruits.Since fruit consumption is important in the human diet, consumers have looked for practicality in both preparation and consumption, a situation that includes minimally processed food. However, minimal processing can damage plant tissues, mainly by pulp browning and by accelerating changes in natural characteristics of the product. This study aimed at minimizing changes in minimally processed sliced peaches by immersing them in solutionswhich contained preservatives.The experiment was a completely randomized design in a 5x3 factorial scheme (5 anti-browning agents x 3 storage periods), with 4 trays per replicateand six slices of peaches in every replicate.Sliced fruits were treated with T1 = control (distilled water); T2 = ascorbic acid at 1% (m/v); T3 = sodium isoascorbate at 1% (m/v); T4 = ascorbic acid at 0.5% (m/v) + sodium isoascorbate at 0.5% (m/v); and T5 = citric acid at 0.5% (m/v)+ sodium isoascorbateat 0.5% (m/v). Afterwards, they were placed on trays, covered with 9? PVC film and stored at 4±1ºC for 0(S1), 6(S2)and 12 (S3) days. The following variables were evaluated: mass loss, pulp color, pulp firmness, soluble solids, titratable acidity, pH, rot spots, total phenols and antioxidant activity. The treatment that consisted of citric acid at 0.5% (m/v) + sodium isoascorbateat 0.5% (m/v) was the most efficient one to controloxidation; its values of browning indexes were the lowest ones, i. e.,15.62 (S1), 17.74 (S2) and 17.58 (S3).Besides, it kept the creamy-white color of the pulp throughout storage time. Made available in DSpace on 2020-11-21T09:13:30Z (GMT). No. of bitstreams: 1 barreto-14-9-2020-1394-1398.pdf: 799804 bytes, checksum: 5f132b12b84031a97436f1ddae51b70d (MD5) Previous issue date: 2020 Preprint.

Cultivation of blackberry has gradually expanded in Brazil, due to their rusticity and low production cost; thus, it stands out as an excellent option for product diversification. There is a need to improve technical information on the management of this crop, especially mineral nutrition. Knowledge of the visual symptoms of nutritional deficiency and foliar contents of the nutrients allows helps farmers to choose the most adequate fertilization for plants. This study aimed at evaluating nutritional aspects and effects of nutrient omission on the growth of BRS Xingu blackberry. Treatments consisted of complete solutions and individual omission of the following nutrients: nitrogen (N), phosphorus (P), potassium (K), calcium (C), magnesium (Mg), boron (B), manganese (Mn), zinc (Zn) and iron (Fe). The following variables were evaluated: leaf dry matter, root dry matter, total dry mass, macro- and micronutrients contents in leaves and visual symptoms of nutrient deficiency. Macronutrient and B deficiencies limit growth of blackberry. B omission led to the highest decrease in plant growth, besides leaf wrinkling, a fact that shows that BRS Xingu is susceptible to its deficiency. Correlation was found between N and Ca, N and P and B and Ca leaf contents. Low leaf contents of N, K, Ca and B were observed when these nutrients were omitted from the solution.

Resumo Kiwis minimamente processados necessitam de técnicas para manter a qualidade dos frutos durante a conservação e o período de prateleira. Aditivos combinados à radiação ultravioleta podem ser uma alternativa para assegurar a qualidade das frutas por mais tempo de conservação. Neste contexto, foi proposto avaliar a eficiência do uso da radiação UV-C e diferentes aditivos na prevenção do escurecimento e conservação de kiwis ‘Bruno’ minimamente processados. As fatias de kiwi foram submetidas a soluções contendo os seguintes tratamentos: controle, ácido ascórbico a 1%; isoascorbato de sódio a 1%; ácido cítrico a 1%, depois, utilizou-se por dois minutos a radiação UV-C na intensidade de 2,71 kJ m-2. As bandejas foram armazenadas em câmara fria a 4 ± 1 ºC de temperatura, com umidade relativa de 85% a 90%, e armazenadas por períodos de 3, 6 e 9 dias. Avaliaram-se perda de massa, coloração da polpa, sólidos solúveis, acidez titulável, incidência de podridão, compostos fenólicos totais e atividade antioxidante. O uso de aditivos melhora a conservação do kiwi minimamente processado, com destaque para o isoascorbato de sódio e o ácido cítrico. Os frutos de kiwi da cultivar ‘Bruno’ podem ser armazenados por até 6 dias sob refrigeração com o uso de aditivos. Após esse período, a perda de massa é elevada. O uso de UV-C não alterou a qualidade dos kiwis durante o armazenamento, podendo ter seu uso dispensado. Abstract Minimally processed kiwis need techniques to maintain the quality of the fruits during conservation and shelf life. The additives combined with ultraviolet radiation can be an alternative to ensure the quality of the fruits for a longer conservation period. In this context, it was proposed to evaluate the efficiency of the use of UV-C radiation and different additives in preventing the browning and conservation of minimally processed 'Bruno' kiwis. The kiwi slices were subjected to solutions containing the following treatments: control, ascorbic acid 1%; 1% sodium isoascorbate; citric acid 1%, after two minutes UV-C radiation was used at an intensity of 2.71 kJ m-2. The trays were stored in a cold chamber at 4 ± 1º C of temperature, with a relative humidity of 85% to 90%, and stored for periods of 3, 6 and 9 days. It was evaluated: mass loss, pulp color, soluble solids, titratable acidity, the incidence of rot, total phenolic compounds, and antioxidant activity. The use of additives improves the conservation of minimally processed kiwi, with emphasis on sodium isoascorbate and citric acid. The kiwi fruits of the cultivar 'Bruno' can be stored for up to 6 days under refrigeration with the use of additives, after which the loss of mass is high. The use of UV-C did not change the quality of kiwis during storage, and their use may be dispensed with.

This study set out to assess the nutritional status of peach trees in the commercial peach-growing region of Pelotas, Rio Grande do Sul. The sample includes 65 peach orchards of the Maciel, Granada, Esmeralda, and Sensação cultivars in the municipalities of Pelotas, Canguçu, and Morro Redondo during the 2018 agricultural cycle. After drying and grinding the leaf samples for an analysis of their nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), boron (B), copper (Cu), iron (Fe), manganese (Mn), and zinc (Zn) content, the results were presented in frequency distributions divided into classes based on the nutrient requirements indicated for the crop in the region, in addition to the correlations between the nutrients. Greater deficiencies were observed in nitrogen, copper, iron, and zinc content. However, potassium content was found in the “above normal” class for most of the samples, and there were correlations between P/Ca, P/Cu, Ca/P, Ca/Mg, and Ca/B. An insufficient use of the tools to assess the nutritional status of the orchards was observed, especially the leaf diagnosis, which led to the inappropriate use of fertilizers and the consequent nutrient imbalance in the plants.

O tempo que os pêssegos permanecem em temperatura ambiente após a colheita, pode comprometer a qualidade dos mesmos. A partir disso, o presente estudo, propôs-se avaliar diferentes períodos que compreende a colheita dos frutos e a sua submissão ao armazenamento refrigerado em relação à qualidade dos pêssegos ‘BRS Kampai’. Os tratamentos foram: T1: após 4 horas da colheita, os frutos foram armazenados em ambiente refrigerado; T2: após a colheita os frutos permaneceram por 24 horas em temperatura ambiente e após armazenados em ambiente refrigerado; T3: após a colheita os frutos permaneceram por 36 horas em temperatura ambiente e após armazenados em ambiente refrigerado. Os frutos permaneceram durante 10 e 20 dias em armazenamento refrigerado, seguidamente de dois dias a temperatura ambiente. As variáveis analisadas foram à perda de massa, firmeza, coloração da epiderme, teor de sólidos solúveis, pH e acidez titulável. Constatou-se que o período em que estes permanecem em temperatura ambiente antes de serem submetidos ao armazenamento refrigerado, influencia nas características de conservação e qualidade dos frutos. Com isso, a menor perda de massa e a maior firmeza, após o armazenamento, são observadas nos frutos que após quatro horas da colheita foram alocados no armazenamento refrigerado.

In cultivation of peaches, thinning is conventionally performed on fruits by hand, and needs to be done in a short time and with specialized labor, which increases the operational costs of this practice. Mechanical thinning can be an alternative to manual fruit thinning. Thus, the objective of this study was to evaluate the effect of mechanical flower thinning with different equipment in advanced peach orchard. The experiment was conducted in 2016 and 2017, combining advanced selections of peach trees and thinning methods. The evaluated variables were percentage of flowers thinning, thinning time, fruit number per plant, plant production, estimated yield, average fruit mass and fruit diameter class. Flower mechanic thinning alters the yield index of peach trees. Mechanical thinning on peach trees was efficient in flower thinning and reduced the practice execution time. Therefore, mechanical thinning is an alternative to the manual fruit thinning of peach trees. Resumo Na produção de pêssegos, o raleio é realizado convencionalmente nos frutos, de forma manual, necessitando ser realizada num curto período de tempo e com mão de obra especializada, o que eleva os custos operacionais desta prática. O raleio mecânico pode ser uma alternativa ao raleio manual de frutos. Deste modo, o objetivo deste trabalho foi avaliar o efeito do raleio mecânico em flores, com distintos equipamentos, em seleções avançadas de pessegueiros. O experimento foi conduzido nos anos de 2016 e 2017, combinando-se seleções avançadas de pessegueiros e métodos de raleio. As variáveis avaliadas foram: percentagem de raleio de flores, tempo de raleio, número de frutos por planta, produção por planta, produção estimada, massa média dos frutos e classe de diâmetro dos frutos. O raleio mecânico de flores altera os índices produtivos dos pessegueiros. O raleio mecânico em pessegueiros foi eficiente no raleio de flores e reduziu o tempo de execução da prática. Portanto, o raleio mecânico de flores é uma alternativa ao raleio manual de frutos de pessegueiros.

Among the factors that affect peach productivity is the proper nutrition of plants, being nitrogen (N) one of the main nutrients for the crop. Thus, the objective of the current study was to evaluate the effect of nitrogen fertilization on macronutrient leaf contents, plant development and production of different genotypes of peach trees cultivated at high planting density, seeking to recommend the most appropriate concentration. The experiment was conducted between 2016 and 2018 using peach selections ‘Cascata 1513’ and ‘Cascata 1067’ and with nitrogen fertilization concentrations (0, 60, 120 and 180 kg ha-1 of N). Pruning mass, trunk diameter, number of fruits per plant, average fruit mass, yield per plant, yield per hectare and leaf macronutrients were evaluated. The increase of N concentration increases the N content in leaves. For the conditions of this experiment the maximum production per plant was obtained for the highest dose of 180 Kg ha of N.

High effective peach fruit set results in an excessive amount of fruits, requiring thinning accomplishment, which is a manual practice and demands specialized labor, raising production costs. In this sense, chemical thinning may be an alternative to improve the peach production chain. The objective of this work was to evaluate the efficiency of 6-benzyladenine (BA) on chemical thinning and the effect of different BA dosages on peach production and color characteristics of 'Maciel' fruits. Treatments consisted of plants without thinning (Control), sprayed BA at doses of 100 mg L-1, 200 mg L-1 and 400 mg L-1, applied 45 days after full bloom (DAPF) and hand thinning at 45 DAPF. The applications of different dosages were carried out by spraying, using backpack spraying equipment. Percentage of thinning abscission, number of fruits per plant, yield per plant, fruit mass, color and average fruit diameter were evaluated. The doses of 200 and 400 mg L-1 BA for thinning increased the percentage of fruit abscission and fruit mass. The doses of 400 mg L-1 BA presented lower yield per plant, but fruits with higher average mass. Increasing BA dose reduced the number of fruits per plant. Hand thinning and 400 mg L-1 BA resulted peach fruits with larger diameter. BA application to thin peaches did not alter the fruit skin color. Therefore, BA may be a chemical thinning alternative for 'Maciel' peach cultivar, because it reduces the time of thinning in plants when compared to manual thinning. For an efficient chemical thinning with BA the product dose must be taken into account, along with climatic conditions and the cultivar.

O fósforo participa de processos vitais nas plantas, como a fotossíntese, a respiração, o armazenamento e transferência de energia, a divisão celular e o crescimento das células. O potássio atua na ativação de algumas enzimas e desempenha um papel importante no equilíbrio de água nas plantas. O presente trabalho teve como objetivo correlacionar os níveis de fósforo e potássio com a produtividade em arroz irrigado, bem como avaliar a viabilidade do uso de agricultura de precisão em área de arroz irrigado. O trabalho foi conduzido durante três safras em sucessão de culturas: arroz, soja, arroz, no município de Santa Vitória do Palmar/RS. Utilizou-se uma área de 22,18 ha, dividida em 15 parcelas, as quais foram georreferenciadas no ponto central. Foi coletada uma amostra de solo em cada parcela, composta por 9 subamostras, que foram encaminhadas para análises químicas. Foram gerados mapas de rendimento e de fertilidade através dos dados das análises de solo e produtividade e criadas zonas de manejo com adubação diferenciada para corrigir e uniformizar os teores de fósforo e de potássio. Os resultados deste trabalho mostram que: a agricultura de precisão proporcionou aumento de fertilidade do solo através do uso de zonas de manejo; o emprego de zonas de manejo diminuiu a variabilidade nos teores de fósforo e de potássio nas parcelas do quarteirão estudado; não houve correlação entre os níveis de fósforo e potássio no rendimento da cultura de arroz irrigado.

The aim of this research was to study the linear correlations and spatial distribution between soil attributes and productivity and physiological quality of wheat seeds. Soil samples were collected at georeferenced points in an area of 41 ha with a rectangular grid of 100 × 100 m to determine soil fertility. Grain productivity, number of ears m-2, protein content, and physiological seed quality were assessed. The results were submitted to Pearson's correlation analysis, descriptive statistics, and geostatistics. Phosphorus content presented a high spatial variability, with a coefficient of variation of 97.79%. Protein content, number of ears, and SMP index presented low values of coefficient of variation, indicating their low spatial variability. Physiological seed quality was not correlated with soil attributes. Wheat productivity showed a strong correlation between calcium and soil organic matter contents, as verified by analyzing the spatial distribution maps. The analysis of the spatial distribution maps of soil nutrients is a tool that can contribute to farmers’ decision making in the management of crop fertilization aiming at increasing productivity.

Phosphorus is part of several organic compounds in plant metabolism such as nucleotides and phosphoproteins, in addition to participating in metabolism and energy storage. This study aimed to evaluate the response of peach trees cv. Sensação to phosphate fertilization and establish the critical level of this nutrient in soil and leaves. The experiment was conducted in the 2016 and 2017 cycles in a commercial orchard located in Morro Redondo, RS, Brazil. The experimental design was a randomized block design with four replications. Peach trees were fertilized with increasing doses of phosphorus (P) of 0, 20, 40, 60, and 80 kg ha?1 of P2O5 as triple superphosphate. In the two evaluated cycles, samples of soil at a depth of 0–20 cm and leaves were collected to determine mineral contents. The data were submitted to analysis of variance by the F test (P < 0.05), and when the effects were significant, regression equations were adjusted. P application increased the contents of this nutrient in the soil. Leaf P contents were not affected by fertilization, as well as productivity and yield components. Thus, the critical level of P in soil and peach leaves could not be established. In soils where P contents are classified as medium and high, there is no need to apply this nutrient.

The objective of this study was to evaluate the reproductive, productive and physicochemical characteristics of fruits (fruit volume and soluble solids) of ‘Packham’s Triumph’ pear trees treated with different doses of phytoregulators. The experiment was carried out in the 2014/2015 and 2015/2016 cycles, using 1-naphthaleneacetic acid (NAA), 2-chloroethyl phosphonic acid (Etefon) and 6-Benzyladenine (BA) phytoregulators, each at doses of 200 and 300 ml L-1. The experimental design consisted of a randomized block with five replicates, where each experimental unit consisted of one plant. Significance was only found for soluble solids in the 2014/2015 harvest, observing that the highest mean was identified in plants treated with 300 ml L-1 Etefon, (15 °Brix), while the lowest soluble solids content was observed with the dose of 200 mg L-1 of NAA, (11 °Brix); in the 2015/2016 crop, the highest number of inflorescences of the year was identified in plants treated with 200 ml L-1 of Etefon, (1.66) and the lowest value for the treatment with 300 ml L-1 of BA, (0.17). Effective fruiting in the value of 58.33% was also observed and verified for the plants treated with 300 mg L-1 of NAA, differing from all except from 200 ml L-1 BA. Only the plant growth regulator, NAA, at the dose of 200 mg L-1 provides low content of soluble solids in the fruits and Etefon 300 mg L-1 provides high content of solids solubles. The lowest number of branch inflorescences of the year was in plants treated with 6-Benzyladenine at a dose of 300 ml L-1 and the highest at a dose of Etefon 200 mg L-1. The NAA dose of 300 mg L-1 and 6-Benzyladenine dose of 200 ml L-1 had greater effective fruiting, but not did not reflect on the production per plant and productive efficiency. There was no benefit observed in the return bloom with the application of phytoregulators. Besides, no benefits were observed in the return bloom with the application of phytoregulators.

O presente trabalho teve como objetivo avaliar a emergência e o potencial de produção de mudas de goiabeira-serrana (Acca sellowiana (O.Berg) Burret) e araçazeiro-pera (Psidium acutangulum DC.), submetidas a diferentes substratos. O delineamento experimental foi inteiramente casualizado com 10 repetições por tratamento, sendo T1 (testemunha): apenas solo; T2: casca de arroz carbonizada + solo + areia; T3: casca de arroz carbonizada + areia + casca de arroz crua e T4: vermiculita expandida. A semeadura foi realizada em bandejas de isopor de 72 células. Avaliou-se, emergência, índice de velocidade de emergência, comprimento de parte aérea e de raízes, massa seca da parte aérea e raízes e teor de cloro la. Os substratos testados tem potencial para serem usados na propagação de goiaba-serrana e araçazeiro-pera. A mistura casca de arroz carbonizada + areia + casca de arroz crua apresentou resultados superiores quanto à emergência e índice de velocidade de emergência de goiaba-serrana. A vermiculita expandida destacou-se positivamente na emergência, índice de velocidade de emergência e atributos de desenvolvimento das mudas de araçazeiro-pera.

Nitrogen, which is the primary nutrient peach trees need, may affect their fruit quality. Thus, this study aimed at evaluating the effect of nitrogen fertilization on two genotypes of peach trees, regarding their fruit quality, in three consecutive crops. The experiment was carried out in the experimental area that belongs to the Embrapa Clima Temperado, located in Pelotas, Rio Grande do Sul (RS), Brazil, from 2016, 2016, 2017 and 2018. Four doses of nitrogen (0, 60, 120 and 180 Kg ha-1) and two peach tree genotypes (‘Cascata 1513’ and ‘Cascata 1067’) were used. For the fruit, we evaluated epidermis color, pulp firmness, epidermis firmness, soluble solids concentration, titratable acidity, concentration of total phenolic compounds, anthocyanins and antioxidant activity. Fruit underwent physical, chemical and bioactive compound analyses. Results showed that the highest dose of nitrogen (180 Kg ha-1) applied to the soil retards fruit ripening, while no application of nitrogen fertilization brings fruit maturation forward. Nitrogen fertilization via soil does not favor anthocyanins in fruit. Doses of 60 and 120 Kg ha-1 of nitrogen are recommended because they lead to improvement in peach color, epidermis firmness and acidity. Peach tree genotypes influence soluble solids, juice pH, phenolic compounds and antioxidant activity of their fruit. O nitrogênio (N) é o nutriente exigido em maior quantidade para o pessegueiro, podendo interferir na qualidade dos frutos. Assim, o objetivo deste estudo foi avaliar o efeito da adubação nitrogenada em dois genótipos de pessegueiros em relação à qualidade dos frutos, durante três safras consecutivas. O experimento foi conduzido nos anos de 2016, 2017 e 2018, na área experimental da Embrapa Clima Temperado, Pelotas, Rio Grande do Sul. Utilizaram-se quatro doses de nitrogênio (0, 60, 120 e 180 Kg ha-1) e dois genótipos de pessegueiros (‘Cascata 1513’ e ‘Cascata 1067’). Foi avaliada a cor da epiderme, firmeza da polpa, firmeza da epiderme, concentração de sólidos solúveis, acidez titulável, concentração de compostos fenólicos totais, antocianinas e atividade antioxidante. Verificou-se que a dose de 180 Kg ha-1 de nitrogênio aplicado no solo atrasa a maturação dos frutos, enquanto que as plantas que não receberam adubação nitrogenada antecipam a maturação. A adubação nitrogenada via solo não favorece as antocianinas nos frutos. As doses de 60 e 120 Kg ha-1 de nitrogênio são indicadas por proporcionar melhorias a coloração, firmeza da epiderme e acidez dos pêssegos. O genótipo de pessegueiro é responsável por influenciar os sólidos solúveis, pH do suco, compostos fenólicos e atividade antioxidante dos frutos

Cultivation of blackberry has gradually expanded in Brazil, due to their rusticity and low production cost; thus, it stands out as an excellent option for product diversification. There is a need to improve technical information on the management of this crop, especially mineral nutrition. Knowledge of the visual symptoms of nutritional deficiency and foliar contents of the nutrients allows helps farmers to choose the most adequate fertilization for plants. This study aimed at evaluating nutritional aspects and effects of nutrient omission on the growth of BRS Xingu blackberry. Treatments consisted of complete solutions and individual omission of the following nutrients: nitrogen (N), phosphorus (P), potassium (K), calcium (C), magnesium (Mg), boron (B), manganese (Mn), zinc (Zn) and iron (Fe). The following variables were evaluated: leaf dry matter, root dry matter, total dry mass, macro- and micronutrients contents in leaves and visual symptoms of nutrient deficiency. Macronutrient and B deficiencies limit growth of blackberry omission led to the highest decrease in plant growth, besides leaf wrinkling, a fact that shows that BRS Xingu is susceptible to its deficiency. Correlation was found between N and Ca, N and P and B and Ca leaf contents. Low leaf contents of N, K, Ca and B were observed when these nutrients were omitted from the solution. Made available in DSpace on 2022-06-22T13:19:38Z (GMT). No. of bitstreams: 1 Artigo-2022-Nutrient-omission-on-growth.pdf: 1264217 bytes, checksum: 3bbc1095e3ff5ba682ca81ab82cb0292 (MD5) Previous issue date: 2022

Kiwis minimamente processados necessitam de técnicas para manter a qualidade dos frutos durante a conservação e o período de prateleira. Aditivos combinados à radiação ultravioleta podem ser uma alternativa para assegurar a qualidade das frutas por mais tempo de conservação. Neste contexto, foi proposto avaliar a eficiência do uso da radiação UV-C e diferentes aditivos na prevenção do escurecimento e conservação de kiwis ?Bruno? minimamente processados. As fatias de kiwi foram submetidas a soluções contendo os seguintes tratamentos: controle, ácido ascórbico a 1%; isoascorbato de sódio a 1%; ácido cítrico a 1%, depois, utilizou-se por dois minutos a radiação UV-C na intensidade de 2,71 kJ m-2. As bandejas foram armazenadas em câmara fria a 4 ± 1 ºC de temperatura, com umidade relativa de 85% a 90%, e armazenadas por períodos de 3, 6 e 9 dias. Avaliaram-se perda de massa, coloração da polpa, sólidos solúveis, acidez titulável, incidência de podridão, compostos fenólicos totais e atividade antioxidante. O uso de aditivos melhora a conservação do kiwi minimamente processado, com destaque para o isoascorbato de sódio e o ácido cítrico. Os frutos de kiwi da cultivar ?Bruno? podem ser armazenados por até 6 dias sob refrigeração com o uso de aditivos. Após esse período, a perda de massa é elevada. O uso de UV-C não alterou a qualidade dos kiwis durante o armazenamento, podendo ter seu uso dispensado. Made available in DSpace on 2021-05-27T15:02:30Z (GMT). No. of bitstreams: 1 Artigo-Influencia-da-radiacao-ultravioleta-e-aditivos.pdf: 609814 bytes, checksum: f5a5de273b88f655a953a1c16eed5929 (MD5) Previous issue date: 2021

This study aimed at evaluating the quality of peaches borne by the cultivar BRS Kampai when cooled at intermittent temperatures throughout storage. They were stored at 1°C and relative humidity between 80% and 90% in a cold storage chamber. The following treatments were applied: T1 - fruit stored at 1±0.5°C; T2 - fruit stored at 1±0.5°C and increase in temperature every five days to 25°C; and T3 - fruit stored at 1±0.5°C and increase in temperature every seven days to 25°C. Fruit were submitted to increase in temperature when they were withdrawn from the cold storage chamber and kept in a heated room. Evaluations were conducted when fruit were harvested, after 10 cold storage days and 2 days of commercialization simulation at 25ºC (10+2) and after 20 cold storage days and 2 days of commercialization simulation at 25ºC (20+2). Peaches were evaluated in terms of mass loss, pulp firmness, soluble solids, titratable acidity, pH and epidermis color. T1 exhibited higher mass loss, higher soluble solid content and higher pulp firmness after 20 cold storage days, by comparison with the other treatments. T2 led to lower mass loss after 20 cold storage days than the ones of the other treatments. However, T2 also showed higher loss of pulp firmness in the same period. The use of intermittent temperatures throughout storage of ?BRS Kampai? peaches may be an alternative to extend their post-harvest period. Made available in DSpace on 2021-09-23T02:15:02Z (GMT). No. of bitstreams: 1 Artigo-Intermittent-temperatures-in-the-conservation.pdf: 391144 bytes, checksum: bcb33666229292d3011f5ad425f848f3 (MD5) Previous issue date: 2021

Para frutíferas de caroço o potássio (K) está relacionado com a qualidade dos frutos. O objetivo deste trabalho foi avaliar diferentes doses de adubação potássica nas características físico-químicas e compostos bioativos de frutos de pessegueiros ‘Esmeralda’. O experimento foi desenvolvido em pomar comercial no município de Morro Redondo, Rio Grande do Sul, Brasil, entre as safras de 2014 e 2017. As doses de potássio aplicadas foram 0, 40, 80, 120 e 160 Kg K2O ha-1. Avaliou-se: coloração da polpa, firmeza da casca e da polpa, sólidos solúveis, pH, acidez titulável, relação SS/AT, compostos fenólicos totais, carotenoides totais e atividade antioxidante. O aumento das doses de K reduziu o teor de compostos fenólicos e a atividade antioxidante nos pêssegos nessa mesma safra. Os parâmetros de qualidade dos frutos, como a acidez titulável e firmeza da polpa não apresentaram alterações com a adubação potássica dos pessegueiros nas quatro safras avaliadas. Entretanto, os sólidos solúveis, relação SS/AT, croma, °Hue, firmeza de casca e compostos bioativos são influenciados pelas doses de K, mas dependem também das condições climáticas e da safra em análise., Revista de Ciências Agrárias, Vol. 43 No. 1 (2020)

Para pessegueiros produzidos na região sul do Brasil ainda são escassas as informações sobre a influência da adubação potássica sobre a qualidade dos frutos. Deste modo, o presente trabalho teve como objetivo avaliar os atributos físico-químicos e compostos bioativos dos frutos de pessegueiros submetidos a diferentes doses de potássio aplicadas no solo por três safras consecutivas. O experimento foi realizado estudando a cultivar Sensação em um pomar comercial no município de Morro Redondo, RS ? Brasil, durante as safras de 2016, 2017 e 2018. Os pessegueiros da cultivar Sensação foram adubados com potássio (K) nas doses de 0, 40, 80, 120 e 160 kg ha-1 de K2O na forma de cloreto de potássio, aplicadas na superfície do solo. Após a colheita foram determinados os teores de sólidos solúveis (SS), acidez titulável (AT), relação SS/AT, pH, coloração da polpa, firmeza da epiderme e da polpa, teor de carotenoides totais, compostos fenólicos totais e atividade antioxidante. A firmeza da epiderme, a relação SS/AT e a concentração de carotenoides dos pêssegos responderam à adubação potássica, mas apenas em alguns ciclos de produção. Os parâmetros de coloração, firmeza da polpa, sólidos solúveis, pH do suco, fenóis totais e atividade antioxidante dos pêssegos não alteraram em decorrência da aplicação de potássio ao solo. Made available in DSpace on 2021-01-19T09:02:24Z (GMT). No. of bitstreams: 1 Artigo-Adubacao-potassica-na-qualidade-de-frutos-de-pessegueiro.pdf: 92009 bytes, checksum: d028a705b6486a58e3ccbff546a879aa (MD5) Previous issue date: 2020

Entre os fatores que afetam a produtividade dos pessegueiros, está a nutrição adequada das plantas, sendo o nitrogênio (N) um dos nutrientes primordiais para a cultura. Deste modo, o objetivo do presente trabalho foi avaliar o efeito da adubação nitrogenada de manutenção nos teores foliares de macronutrientes, no crescimento das plantas e na produção de diferentes genótipos de pessegueiros cultivados em alta densidade de plantio, buscando-se recomendar a concentração mais adequada. O experimento foi conduzido entre 2016 e 2018, com seleções avançadas de pessegueiros "Cascata 1513" e "Cascata 1067", e com concentrações de adubação nitrogenada (0; 60; 120 e 180 kg ha-1 de N). Avaliaram-se: massa de poda, diâmetro de tronco, número de frutos por planta, massa dos frutos, produção por planta e teor de macronutrientes nas folhas. O incremento das concentrações de N aumenta o teor do N nas folhas. Para as condições deste experimento, a máxima produção por planta foi obtida para a maior dose de 180 kg ha de N. Made available in DSpace on 2020-11-21T09:15:45Z (GMT). No. of bitstreams: 1 0100-2945-rbf-42-6-e-629.pdf: 578387 bytes, checksum: 25a81bb2e5674abecf7154188600bb31 (MD5) Previous issue date: 2020

O presente trabalho teve como objetivo caracterizar nutricionalmente plantas de pessegueiro na região produtora de Pelotas, RS. Foram amostrados 65 pomares de pessegueiros das cultivares Maciel, Granada, Esmeralda e Sensação nos municípios de Pelotas, Canguçu e Morro Redondo no ciclo produtivo de 2018. As amostras foliares, após secas e moídas, foram analisadas quanto aos seus teores de nitrogênio (N), fósforo (P), potássio (K), cálcio (Ca), magnésio (Mg), boro (B), cobre (Cu), ferro (Fe), manganês (Mn) e zinco (Zn) e os resultados foram apresentados em distribuições de frequência nas classes de suficiência indicadas para a cultura na região além da correlação entre os nutrientes. Observou-se maiores deficiências nos teores de nitrogênio, cobre, ferro e zinco. Entretanto, para a maioria das amostras, os teores de potássio encontraram-se na classe ?acima do normal?, encontrou-se correlações entre P/Ca, P/Cu, Ca/P, Ca/Mg e Ca/B. É possível constatar a carência do uso de ferramentas para avaliar o estado nutricional dos pomares, principalmente a diagnose foliar, o que levou ao uso inadequado de fertilizantes e consequentemente um desbalanço nutricional das plantas. PALAVRAS-CHAVE: adubação, análise foliar, diagnose nutricional, Prunus persica Made available in DSpace on 2020-12-19T09:02:09Z (GMT). No. of bitstreams: 1 Gilberto-Nava-4-17896-Navroski-et-al-.pdf: 125431 bytes, checksum: 8286b1034f0e94931eb40b6286df1a3f (MD5) Previous issue date: 2020

Made available in DSpace on 2020-03-03T00:40:11Z (GMT). No. of bitstreams: 1 JosePereiraRALEIOMECANICOCOMOALTERNATIVANOCULTIVODOPESSEGUEIRO.pdf: 667530 bytes, checksum: eb2bc23cbf38f1922cabc7103eaaac31 (MD5) Previous issue date: 2019

Made available in DSpace on 2019-11-10T00:34:19Z (GMT). No. of bitstreams: 1 GilbertoNavaArtigoFosforoRenan.pdf: 1002326 bytes, checksum: 06995e18bcb747c09d3c6b5dda16d1f5 (MD5) Previous issue date: 2019

Made available in DSpace on 2018-01-08T23:24:59Z (GMT). No. of bitstreams: 1 LuizEduardoCorreaPortadaAITEPFrenteVOL18No2.pdf: 413561 bytes, checksum: 23bfb0c15bc4831d2dea42708616281d (MD5) Previous issue date: 2018-01-08

Made available in DSpace on 2018-03-29T00:37:24Z (GMT). No. of bitstreams: 1 GilbertoNavadocument.pdf: 493457 bytes, checksum: 1bd5884eeb82d94d768b4e1d01e6ef1d (MD5) Previous issue date: 2018-03-28