Phosphorus fertilizer placement and rate affect soybean root growth and nutrient uptake in soil with high fertility

  • Fernando Hansel Kansas State University
  • Dorivar Diaz Kansas State University
  • Alexandre Rosa University of Nebraska
  • Colby Moorberg Kansas State University
Keywords: High soil test P, mineral fertilization, morphological imbalances, P fertilization strategy, root system growth, soybeans.

Abstract

O manejo do fertilizante fósforo (P) pode alterar o crescimento da raiz e da parte aérea da soja, promovendo desequilíbrios morfológicos na planta. Com o objetivo de avaliar os ajustes morfológicos da soja (Glycine max (L.)) em diferentes colocações e taxas de adubação fosfatada em solo P, foi realizado um estudo em casa de vegetação com dois objetivos principais: 1) avaliar o efeito da adubação fosfatada sobre a raiz e acúmulo de biomassa na parte aérea e as alterações associadas no comprimento das raízes; e, 2) estimar o efeito das alterações do crescimento radicular na absorção de macro e micronutrientes na planta. Os tratamentos com fertilizantes foram: (1) transmissão P na superfície do solo (BR), (2) P5x5 cm (B) aplicada na faixa (B) e (3) banda profunda P a 20 cm de profundidade (DB); usando duas taxas: (1) 60 e (2) 120 kg P2O5 ha-1 em solo com alta fertilidade. Imagens de minirhizotron e medidas de SPAD foram realizadas uma vez por semana até o florescimento. O peso seco da raiz e da parte aérea, bem como a absorção total de macro e micronutrientes foram avaliados no mesmo estágio. O aumento dos níveis de P no solo promovidos pela adubação mostra um efeito negativo no peso seco da raiz na taxa de 60 kg P2O5 ha-1 e muito pouco estímulo à alocação de biomassa nas raízes quando a taxa de P foi aumentada para 120 kg P2O5 ha -1 em tratamentos B e DB. O tratamento de controlo (sem fertilizante) mostrou um comprimento de raiz 108% maior do que o tratamento com B-60. Essas alterações também alteraram a absorção de macro e micronutrientes e afetaram o teor de clorofila nas plantas de soja. O aumento dos níveis de P no solo promovidos pela adubação mostra um efeito negativo no peso seco da raiz na taxa de 60 kg P2O5 ha-1 e muito pouco estímulo à alocação de biomassa nas raízes quando a taxa de P foi aumentada para 120 kg P2O5 ha -1 em tratamentos B e DB. O tratamento de controlo (sem fertilizante) mostrou um comprimento de raiz 108% maior do que o tratamento com B-60. Essas alterações também alteraram a absorção de macro e micronutrientes e afetaram o teor de clorofila nas plantas de soja. O aumento dos níveis de P no solo promovidos pela adubação mostra um efeito negativo no peso seco da raiz na taxa de 60 kg P2O5 ha-1 e muito pouco estímulo à alocação de biomassa nas raízes quando a taxa de P foi aumentada para 120 kg P2O5 ha -1 em tratamentos B e DB. O tratamento de controlo (sem fertilizante) mostrou um comprimento de raiz 108% maior do que o tratamento com B-60. Essas alterações também alteraram a absorção de macro e micronutrientes e afetaram o teor de clorofila nas plantas de soja.

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Author Biographies

Fernando Hansel, Kansas State University
Departamento de Agronomia
Dorivar Diaz, Kansas State University
Departamento de Agronomia
Alexandre Rosa, University of Nebraska
Departamento de Agronomia
Colby Moorberg, Kansas State University
Departamento de Agronomia

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Published
2019-07-05
How to Cite
Hansel, F., Diaz, D., Rosa, A., & Moorberg, C. (2019). Phosphorus fertilizer placement and rate affect soybean root growth and nutrient uptake in soil with high fertility. Agronomy Science and Biotechnology, 5(1), 62. https://doi.org/10.33158/ASB.2019v5i1p62
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Article