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Bacterial endophytes are plant-associated microorganisms colonizing internal tissues without causing any symptoms to their hosts. Their intimate relation with the plant can trigger several beneficial traits for their host, such as growth improvement and tolerance to some biotic and abiotic factors. Therefore, endophytic bacteria can be used as agro-inoculants in various crops suitable for organic production, such as sweet potato. The aim of this study is to reveal the potential use of bacterial endophytes as biocontrol agents against sweet potato pathogens. Selected endophytic bacterial strains revealed antifungal activity against important tuber, root and stem pathogens, belonging to Fusarium, Botrytis, Curvularia and Trichothecium genera. [ABSTRACT FROM AUTHOR]

In the area of sandy soils in the south of Oltenia, the air temperature can vary during the vegetation period. The elements of productivity and the production of peanuts differ according to the variety and the conditions of growth and development. Tile elements of productivity are influenced by air temperature, and high air and soil temperature influence pod production negatively, too. Peanut varieties react differently depending on their tolerance to high temperatures. The cultivation of genotypes of peanuts that tolerate heat stress is becoming more and more important for high yields. Of the studied genotypes, the HYY 1, HYY2, Provenance China 2, Henan Province genotypes proved to be tolerant to thermal stress and obtained the highest values for some elements of productivity and yields that exceeded 5000 kg / ha. [ABSTRACT FROM AUTHOR]

Copyright of Oltenia, Studii si Comunicari Seria Stiintele Naturii is the property of Museum of Oltenia Craiova and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

During 2018-2019, research was conducted on the sandy soils of southern Oltenia regarding the influence of irrigation water on sweet potato production and on the nutritional quality of tubers. The experiment took place on a sandy soil with a low to high supply of nitrogen, a high supply of phosphorus, a low supply of potassium, a low to medium supply of organic carbon, and a moderately acidic to neutral reaction. The best production results were obtained under the conditions of 2019, in the irrigated variants with watering norms of 145 m³/ha and 290 m³/ha, over a period of 100 days from plantation (30.18-31,75t / Ha). The increase of the watering norm. as well as of the irrigation period led to the decrease of the production of tubers, The biochemical composition of the tubers was influenced by the amount of water administered through irrigation. The best results were obtained in the variant irrigated with a watering norm of 290 m³/ha up to 100 days after plantation. The irrigation of the crop up to 110 days after plantation led to a decrease in the amount of total dry matter in the tubers. A correlation given by a polynomial equation of the second degree was established between the production of tubers and the amount of total dry matter in the tuber, with a significant distinct correlation factor r = 0.73 **. The quantity of total dry matter in the tubers decreases directly with the increase in the production of tubers. The accumulation of march in the tubers was influenced differently by the application of water through irrigation, during the two years of study. The starch tends to accumulate, with the increase of the applied water quantity, significantly under the conditions of 2018 and insignificantly in 2019. [ABSTRACT FROM AUTHOR]

Copyright of Oltenia, Studii si Comunicari Seria Stiintele Naturii is the property of Museum of Oltenia Craiova and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Peanut culture can be considered as one of the most advantageous and cost-effective crops, taking into account the production results that can be obtained and the many fields of use of the obtained harvest. In our country, given the importance of peanuts in human nutrition and in some compartments of the industry, cultivated areas with peanuts should be on the increase. The growing demands on the variety of products that can be obtained from this plant and their quality will in the near future contribute to the expansion of the areas to be cultivated with this plant within the limits of a profitable economic efficiency. From the assortment of Chinese varieties, the highest yields of pods were recorded in the Origin China 2 (3690 kg / ha) with a yield of 657 kg / ha compared to the control variety, in the Ning variety with 3571 kg / ha, in the variety Origin China 1, with 3238 kg / ha. [ABSTRACT FROM AUTHOR]

Climate change in recent years is strongly related to agricultural production, water resources, and species diversity. Sweet potato culture has great potential in light of the imminent challenges associated with drought as a negative effect of climate change. The results obtained with regard to the production and quality of sweet potato tubers on sandy soils in south-west Oltenia are similar to those obtained in different countries of the world. The studied varieties showed a high production and large quantities of total dry matter, starch and C vitamin. The analysed varieties were influenced differently by the sum of the temperature degrees and precipitations, in terms of the quality of the tubers. The total dry matter content and starch of sweet potato tubers content was not significantly influenced by STD and precipitations. The amount of total dry matter exceeded most varieties 30% at a STD of 3700-3800 °C. The largest amount of starch in sweet potato tubers was determined in 2016 at a precipitations rate of 350mm (17.06%) and, depending on the STD at 3700 °C during vegetation, starch is assimilated into tubers in a high percentage. Depending on precipitations, tuber production has an insignificant growth trend. The production of sweet potato tubers was significantly influenced almost all varieties of STD during the vegetation period, and the highest yields were obtained in STD, between 3650-3700 °C. The data obtained in sandy soils are similar to those obtained by (EARL & DAVIS, 2003; BAGAMBA et al., 2012; PLACIDE et al. 2013; FALOLA & ACHEM, 2017 etc.), who consider sweet potato as a culture tolerant to drought and potential food security. [ABSTRACT FROM AUTHOR]

Copyright of Oltenia, Studii si Comunicari Seria Stiintele Naturii is the property of Museum of Oltenia Craiova and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Oltenia, Studii si Comunicari Seria Stiintele Naturii is the property of Museum of Oltenia Craiova and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)