The aim of this work was to verify the influence of hydrogel application during plant development on the biochemical composition of soybean grains. The experiment was carried out in a randomized complete block design with four replicates, in a 5x2 factorial scheme, with five concentrations (0, 5, 10, 15 and 20 kg ha -1 ) and two hydrogels sources (Hydroplan and Polim-Agri). The soybean cultivar used was MonSoy 8644.The biochemical contents evaluated were: oil, soluble carbohydrates, amino acids, starch, and proteins. The use of hydrogel was an alternative for grain production, since there no major changes in the contents of the biochemical compounds analyzed here. Highlighted Conclusions1) The use of hydrogel for the maintenance of soybean yield when cultivated in water deficit do not impaired the grain biochemical quality. 2) There is an interaction between carbohydrates and proteins levels, but not between oil and proteins in the treatment with hydrogel's doses.
Os bioativadores podem proporcionar maior disponibilidade de P às plantas. O objetivo deste estudo foi avaliar a resposta da utilização de bioativador de solo e planta e adubação fosfatada nas características de rendimento da soja. O delineamento foi em blocos casualizados, com quatro repetições, em esquema fatorial (5x6), sendo o primeiro fator constituído pela combinação de doses de superfosfato triplo mais as doses do bioativador do solo (100% de SFT com 0% de BS; 75% de SFT com 25% de BS; 50% de SFT com 50% de BS; 25% de SFT com 75% de BS e 0% de SFT com 100% de BS) e o segundo fator constituído de 6 doses do bioativador de planta (0, 75, 150, 225, 300 e 375 g ha-1). A fonte de adubação fosfatada foi o superfosfato triplo. O bioativador de solo foi aplicado 10 dias antes da semeadura. Nos estádios V4 e R1 foi aplicado o biotivador de planta. As características avaliadas foram: número de grãos por vagem, número de vagens por planta, altura de planta, altura de inserção de primeira vagem, massa de mil grãos e produtividade de grãos. Não foram constatadas respostas satisfatórias da utilização de bioativador foliar em plantas de soja. A utilização de 100% do super fosfato triplo compôs sempre o grupo estatístico de melhores médias para as características altura de inserção de primeira vagem, número de vagem por planta, número de grãos por vagem, massa de mil grãos e produtividade de grãos. A utilização de bioativador de solo pode contribuir para a redução das doses de P mineral visando otimizar os custos de produção da cultura.
O estudo foi conduzido em solo Hidromórfico de várzea irrigada em Formoso do Araguaia-TO, na safra 2011/2012. O delineamento experimental foi em faixas sob esquema fatorial 2x5, com quatro repetições. As doses avaliadas foram 25, 50, 75, 100 e 125 kg ha-1 de N. As características avaliadas foram altura de plantas, número de panículas, produtividade de grãos, massa de cem grãos, teor de nitrogênio e Índice de clorofila total. Os dados foram submetidos à análise de variância e de regressão ao nível de 5% de probabilidade pelo teste F. Produtividades máximas foram de 8.269 e 7.563 Kg ha-1 para Irga 424 e Epagri 116, respectivamente. A dose máxima recomendada é de 103 kg ha-1 de N para Irga 424. As doses testadas não foram suficientes para encontrar a máxima produtividade do cultivar Epagri 116, ambos os cultivares apresentaram teores de adequados de N a partir da dose de 50 Kg ha-1 .
This study aimed to evaluate the response curve of phosphorus fertilization to the development and productivity of Salvia hispânica L. in Cerrado soils in the South of Tocantins. The Chia seeds used in the experiments came from producers in the region of Katueté -Paraguay. The experiments were carried out in the experimental area at the Federal University of Tocantins, University Campus of Gurupi-TO, in the agricultural years 2014/2016, through a randomized block design with four repetitions. The treatments consisted of five levels of phosphorus fertilizer (0, 30, 60, 90 e 120 kg ha −1 ). At 120 days after emergence, the following characteristics were evaluated plant height, upper stem height, stem diameter, bunches number, length of bunches, and grain Productivity. The data were submitted to analysis of variance and regression at the 5% probability level by the F test. The analysis of the results showed that the doses of 30 and 60 kg ha −1 of phosphorus influenced positively in the most development and productivity in the culture of Chia in the harvest 2014/2015. The results also showed that increasing doses of phosphorus had not positive effects in the agronomic characteristics at the cultu re of Chia n the harvest 2015/2016. The maximum grains Productivity found in the isolated doses of P was superior to 157 kg ha −1 .
Investigations related to the effects of the hydrogel use in a water-deficit conditions on the biochemical composition of the harvested products are scarce. The aim of this study was to verify the influence of hydrogel on the biochemical response of cowpea beans produced under water-deficit in southern Tocantins. The experiment was a randomized complete block design with four replications. The treatments were obtained in a 2x5 factorial scheme, being: two sources of hydrogel (Hydroplan-EB HyC and Polim-Agri PP) and five concentrations (0, 5, 10, 15, and 20kg ha-1). After harvesting, the grains of cowpea, BRS Vinagre cultivar, were ground and chemically analyzed. The oil content of the seeds agreed with the reference values. The use of Polim-Agri PP promoted the best levels of amino acids (0.38mg g-1) and proteins (243.22mg g-1) of the grains. The carbohydrate content of them (Ȳ= 81.44mg g-1) was better using Hydroplan-EB HyC, regardless of the concentration applied. The application of 6.28kg ha-1 of Polim-Agri PP provided the highest starch content (842g mg-1). The use of hydrogel improves the biochemical quality of cowpea beans produced under water deficit in southern Tocantins.
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