Abstract
In tropical soils, soil acidity can increase the efficiency of phosphated fertilization. The objective of this study was to evaluate the effect of two soil correctives and phosphorus rates on nutritional efficiency of Stylosanthes guianensis cv. Mineirao. The experiment was carried out in a greenhouse at the Department of Soil Science, Universidade Federal de Lavras (UFLa), Minas Gerais State, Brazil. A randomized blocks design was used in a 5x2 factorial arrangement, with five P rates (50 mg dm -3 , 100 mg dm -3 , 200 mg dm -3 , 400 mg dm -3 , and 800 mg dm -3 of soil) and two soil correctives (lime and Ca and Mg silicate), with three replicates. The use of silicate for soil correction provided higher accumulation of Mineirao dry matter rates, from 50 mg dm -3 to 420 mg dm -3 of P. When phosphorus was associated with Ca and Mg silicate, the nutrients P, N, Ca, Mg, and Zn increased their use efficiency, resulting in a higher conversion rate of nutrients into biomass produced, except for the application of 800 mg dm 3 , due to nutritional imbalance in supplies of P and Zn. The Ca and Mg silicate provided greater recovery of applied P and should be used for pasture formation and management where Mineirao is used. KEY-WORDS: Stylosanthes guianensis cv. Mineirao; Ca and Mg silicate; lime; phosphorus utilization.
Highlights
In tropical soils, soil acidity can increase the efficiency of phosphated fertilization
O acúmulo de matéria seca total foi influenciado pela interação doses de P x corretivos (P < 0,05)
Relaciona-se este comportamento a desbalanços no fornecimento de P e Zn, confirmados pela diagnose visual, para deficiência de Zn observada em plantas de estilosantes Mineirão, no solo corrigido com silicato e submetido às maiores doses de P
Summary
Soil acidity can increase the efficiency of phosphated fertilization. Objetivou-se, por meio deste trabalho, avaliar o efeito de dois corretivos de acidez do solo e de doses crescentes de fósforo, sobre o crescimento e as eficiências nutricionais em Stylosanthes guianensis cv. Os nutrientes P, N, Ca, Mg e Zn tiveram suas eficiências de utilização aumentadas, quando a adubação fosfatada foi associada à silicatagem, ocorrendo maior conversão do nutriente em biomassa produzida, exceto para a dose 800 mg dm, em função do desbalanço nutricional nos fornecimentos de P e Zn. A silicatagem proporcionou maior recuperação do P aplicado e deve ser usada na formação e manejo de pastagens onde o estilosantes Mineirão for utilizado. Objetivou-se avaliar os efeitos de dois corretivos de acidez do solo (silicato de Ca e Mg ou calcário dolomítico) e de doses crescentes de fósforo, sobre o crescimento e as eficiências nutricionais em Stylosanthes guianensis cv.
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