ABSTRACT
The fast decline in the physiological quality of seeds during storage is a serious problem. It is known that the reduction of seed quality may be related to its biochemical constitution. However, the relationship between the composition and the mechanisms linked to the loss of vigor of soybean seeds during aging has not been elucidated yet. Thus, the aim of this work was to analyze the role of the biochemical composition of soybean seeds in the physiological quality and in the tolerance to deterioration due to natural and artificial aging. Seeds of six soybean genotypes were analyzed initially and after being submitted to natural aging, storage for eight months, and artificial aging, using the temperature of 41 °C and 100 % relative humidity for 96 h. Moisture content, germination and vigor tests were carried out. Also, there were measured the content of oil, total protein, soluble protein, malonaldehyde, and fatty acids palmitic, stearic, oleic, linoleic, and linolenic. It was verified that the physiological quality of soybean seeds decreased with both kinds of aging. However, the deterioration process occurs by distinct mechanisms. The biochemical composition of the seeds is associated with the physiological quality and their storage potential is changed by natural and artificial aging. The tolerance of the seed to deterioration is related to soluble protein and fatty acids content. Oleic fatty acid and soluble protein can be used as indicators of physiological quality in soybean seeds.
ABSTRACT
Métodos associados à jardinagem tornaram-se uma boa alternativa de lazer para lidar com o isolamento social e as dificuldades geradas pela pandemia da COVID19. Com este estudo objetivou-se avaliar motivação da população para a prática da jardinagem antes e durante o isolamento social e suas principais contribuições. A coleta de dados foi realizada através de um questionário contendo 23 questões, e divulgado via internet. Os dados obtidos foram tabulados em planilha de Excel e posteriormente alguns dados foram analisados com o auxílio do software estatístico R versão 4.1.0 para Windows. Diante do presente estudo foi possível observar que a população acredita que o cultivo de plantas em casa melhora a qualidade de vida durante o confinamento da COVID-19, sendo uma opção de lazer onde muitos se beneficiaram, seja de forma física ou emocional, pelo contato com a natureza.
Methods associated with gardening have become a good leisure alternative to cope with social isolation and the difficulties generated by the pandemic of COVID-19. With this study we aimed to evaluate the population motivation to practice gardening before and during social isolation and its main contributions. The collecting of data was done through a questionnaire containing 23 questions, and disseminated via Internet. The data collected was tabulated in Excel spreadsheet and later some data were analyzed with the assistance of the statistical software R version 4.1.0 for Windows. In this study it was possible to observe that the population believes that growing plants at home improves the quality of life during the COVID-19 confinement, being a leisure option where many benefited, physically or emotionally, from the contact with nature.
ABSTRACT
The use of cultivars adapted to the climate and soil conditions associated with adequate irrigation supply maximizes lettuce agronomic performance. The aim of this work was to evaluate the agronomic performance of four lettuce cultivars submitted to five different drip irrigation depths under a protected environment in Viçosa-MG, Brazil. A randomized block design was applied in a split plot scheme with four replications, and several agronomic characteristics were evaluated by analysis of variance, Tukey range tests, regression and principal component analysis. A higher chlorophyll concentration in the Raider Plus cultivar promoted the production of more leaves, leading to a higher phytomass. The Luara cultivar presented a higher number of commercial leaves per plant than the other cultivars, regardless of the irrigation depth, reflected in a larger diameter and volume of the aerial part of the plants. The Raider Plus and Luara cultivars presented better root development than that of the other cultivars, reducing the effect of plant water stress even under lower irrigation depth conditions. Although higher water productivity (WP) was observed for the lowest irrigation depth (50% of ETc), important variables reached the maximum values at depths higher than 100% water replenishment. Therefore, Raider Plus and Luara cultivars with an irrigation depth of 110% of crop evapotranspiration provided better commercial lettuce quality and are recommended for lettuce cultivation in the research region and under conditions similar to those of the present study.
