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Forage sorghum is a crop that can be planted in semiarid regions, due to its greater adaptability to dry climate environments, and can replace maize in these regions, which are often unsuitable for its production. Thus, the objective of the study was to evaluate the structural, morphological and nutritional characteristics of 23 sorghum hybrids forage cultivated in rainfed conditions, planted in different climate conditions, comparing the hybrids, in order to determine what produces the best in the climatic conditions of the explored region, and also to indicate whether this crop can be planted as a replacement for maize in environments not suitable for planting it. The research was conducted in climate BSh in the Municipality of Alvorada do Gurgueia, and climate Aw in the Municipality of Bom Jesus, both in the state of Piauí from 2014 to 2015. Each trial consisted of 20 experimental forage sorghum hybrids [Sorghum bicolor (L.) Moench], and three commercial hybrids. A randomized block design was used, with three replications in a factorial scheme (2 × 23). The growth characteristics determined were hybrid × climate interaction for the variables plant height, lodging and leaf/stem ratio. For the variable number of tillers, there was a significant difference only between hybrids. There was no difference between hybrids only for the lodging variable of climate Aw. The other variables showed a difference in all hybrids evaluated. There was an interaction for production of dead matter and total dry forage mass between the different environments and hybrids evaluated. For leaf production, there was an effect only for the different environments. For the chemical characteristics, there was an interaction for all variables analyzed between the different environments and hybrids evaluated. The semi-arid region of the State of Piauí, climate BSh which presents a high climatic risk for maize cultivation, proved to be favorable for forage sorghum production. The forage sorghum also presented agronomic characteristics similar to those found in semi humid climate Aw, a favorable region for maize cultivation. In addition, the tested hybrids showed good chemical characteristics, so the BSh climate has great exploratory potential for the cultivation of forage sorghum. O sorgo forrageiro é uma cultura que pode ser plantada em regiões semiáridas, devido a sua maior adaptabilidade a ambientes de climas secos, podendo substituir a cultura do milho nessas regiões que são impróprias para sua produção. Com isso, o objetivo do trabalho foi avaliar as características estruturais, morfológicas e nutricionais de 23 híbridos de sorgo forrageiro cultivados em regime de sequeiro, plantados em diferentes climas, comparando os híbridos com finalidade de determinar o que melhor produz nas condições climáticas da região explorada, e também para indicar se essa cultura pode ser plantada em substituição ao milho em ambientes não adequados para o plantio do mesmo. A pesquisa foi realizada em clima BSh no município Alvorada do Gurguéia, e clima Aw no município de Bom Jesus, ambos no estado do Piauí nos anos de 2014 a 2015. Cada ensaio consistiu de 20 híbridos experimentais de sorgo forrageiro [Sorghum bicolor (L.) Moench] e três híbridos comerciais. O delineamento foi em blocos casualizados com três repetições, em esquema fatorial (2 × 23). Para as características de crescimento, houve interação híbrido × clima para as variáveis altura de planta, acamamento e relação folha/colmo. Para a variável número de perfilhos, houve diferença significativa apenas entre os híbridos. Não houve diferença entre os híbridos apenas para a variável acamamento clima Aw. As demais variáveis apresentaram diferença em todos os híbridos avaliados. Houve interação para produção de matéria morta e massa seca total de forragem entre os diferentes ambientes e híbridos avaliados. Para a produção de folhas, houve efeito apenas para os diferentes ambientes. Para as características químicas, houve interação para todas as variáveis analisadas entre os diferentes ambientes e híbridos avaliados. A região semiárida do Estado do Piauí, clima BSh que apresenta alto risco climático para o cultivo do milho, mostrou-se favorável à produção de sorgo forrageiro. O sorgo forrageiro também apresentou características agronômicas semelhantes às encontradas no clima semiúmido Aw, região favorável ao cultivo do milho. Além disso, os híbridos testados apresentaram boas características químicas, portanto o clima BSh possui grande potencial exploratório para o cultivo de sorgo forrageiro.

Made available in DSpace on 2022-04-28T19:44:53Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01 The aim of this study was to evaluate the quality of Paredão grass silage (Panicum maximum Jacq.) with fermented juice produced from corn silage in different fermentation periods, as bioinoculant, through the characteristics: gas and effluent losses, dry matter recovery, chemical composition, microbiological profile and aerobic stability. The treatments consisted of fermented corn silage juices obtained in different fermentation periods, which were: 0, 5, 10, 15 and 30 days of fermentation, and were used as a bioinoculant additive in Paredão grass silage. The lowest effluent losses were observed in silages containing corn silage juice fermented for 10 days, while the highest dry matter recovery values were observed in silages containing corn silage juice fermented for 30 days. The highest values of crude protein were observed in silages containing corn silage juice fermented for 10 days. The highest content of lactic acid (53 ± 2.2 g/kg DM) was observed in the Paredão grass silage containing corn silage juice fermented for 10 days. The inclusion of corn silage juice fermented for 10 days as bioinoculant improves the quality of Paredão grass silage, as it presented greater recovery of the silage dry matter, higher crude protein content and greater amount of beneficial acids São Paulo State University (Unesp) Federal University of Piauí Federal University of Campina Grande São Paulo State University (Unesp)

Made available in DSpace on 2022-04-28T17:20:53Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01 Federal University of Piaui This study aimed to evaluate the agronomic parameters and the chemical composition of the cactus pear variety Doce (Nopalea cochenillifera) in different Brazilian savannah localities, subjected to different nitrogen fertilization strategies. A randomized block design was used in this experiment, with a 2x 4 x 2 factorial arrangement with five replications. The factors corresponded to two application frequencies of nitrogen fertilization (30 days and 30/60 days), four nitrogen doses (0, 100, 200, 400 kg ha(-1) year(-1)), and two cactus pear cultivation localities, with Locality 1 corresponding to the municipality of Curimata and Locality 2 corresponding to the municipality of Riacho Frio. After one year of cultivation, there was no interaction (P>0.05) for frequency x doses x locality, doses x locality, and frequency x doses. The means observed for fresh and dry matter production varied from 57.0 to 68.0 +/- 2.9 t ha(-1) and from 2.4 to 3.7 +/- 0.2 t ha(-1), respectively. There was an interaction (P