Nodulation, Growth and Soybean Yield in Response to Seed Coating and Split Application of Phosphorus

Abstract

-Phosphorus is one of the most important nutrients for soybeans, but it presents a complex dynamic in the soil and can become unavailable. The split and localized application of this nutrient can be an effective approach to increase its availability. The aim of this study was to evaluate the effect of a split phosphorus dose applied to the soil and the seed coating with monobasic sodium phosphate on nodulation, growth and yield components of soybean cultivar BRS Valiosa RR. The experiment was conducted in a greenhouse in a completely randomized design in a 2x5x3 factorial arrangement, i.e., coating or not the seeds; five doses of phosphorus applied to the soil; and three times of splitting phosphate fertilizer. Phosphorus content in the index leaf (IL), dry matter of shoots, roots and nodules, yield components, and plant height were evaluated. There was an increase in nodulation and growth of plants with increased levels of phosphorus applied to the soil. In smaller doses, the seed coating and the splitting of phosphorus fertilizer increased nodulation, growth and yield components of plants. Thus, the splitting of the phosphorus dose, combined with seed coating, is indicated for increasing the yield components of soybean plants.Index terms: Glycine max, phosphorus availability, seed treatment. Nodulação, Crescimento e Rendimento de Plantas de Soja em Resposta aoRecobrimento das Sementes e Parcelamento da Adubação Fosfatada RESUMO -O fósforo é um dos nutrientes mais importantes para a soja, porém apresenta uma dinâmica complexa no solo e pode tornar-se indisponível. A aplicação parcelada e localizada desse nutriente pode ser tática eficiente para aumentar sua disponibilidade. Assim, objetivou-se avaliar o efeito do parcelamento da dose de P aplicada ao solo e do recobrimento das sementes com fosfato de sódio monobásico na nodulação, no crescimento e nos componentes de rendimento de plantas de soja cultivar BRS Valiosa RR. O experimento foi conduzido em casa de vegetação em delineamento inteiramente casualizado, em esquema fatorial 2x5x3, ou seja, recobrimento ou não das sementes; cinco doses de P aplicados ao solo; e três épocas de parcelamento da adubação fosfatada. As seguintes variáveis resposta foram avaliadas: teor de P na folha índice, matéria seca da parte aérea, da raiz e dos nódulos, componentes de rendimento e altura de plantas. Houve incremento na nodulação e no crescimento das plantas com o aumento das doses de fósforo aplicado no solo. Nas menores doses, o recobrimento das sementes e o parcelamento da adubação fosfatada aumentaram a nodulação, o crescimento e os componentes do rendimento das plantas. Assim, o parcelamento da dose de P, aliado ao recobrimento das sementes, é indicado para aumentar os componentes de produtividade das plantas de soja.Termos para indexação: Glycine max, disponibilidade de fósforo, tratamento de sementes.

Mineralogy and Maximum Phosphorus Adsorption Capacity in Soybean Development

“…On the other hand, in TH this response was linear, corroborating the results of Soares, Sediyama, Neves, Júnior and Silva (2016). Such observed characteristic in TH can be attributed to a more kaolinite mineralogy, due to the lower adsorption potential of this mineral.…”

Changes in early soybean mycorrhization with the application of seaweed extracts to seeds

“…In terms of nodulation, a similar response to P rates was found by different authors (Bressan et al, 2001;Soares et al, 2016), indicating that phosphorus has an important role in this type of symbiosis, mainly as a key component of energy sources, such as ATP, highly required during nodulation processes and normal nodule functioning. Moreover, an inadequate supply of P limits the translocation of sugars, crucial for this symbiosis (Hawkesford et al, 2011).…”

Co-fertilization of Sulfur and Struvite-Phosphorus in a Slow-Release Fertilizer Improves Soybean Cultivation

“…Soybean ( G. max L.) was cultivated in rhizotrons with different sources of S and P over 40 days. This crop was selected for the study due to its high demands on both P and S nutrition ( Zhao et al, 2008 ; Soares et al, 2016 ; Ibañez et al, 2020 ). A substrate with low to moderate concentrations of P and S was used to favor the absorption of nutrients supplied via the fertilizers.…”