To support rural extension activities for family farming in the western Amazon, we evaluated the production of Mombasa grass (Panicum maximum Jacq) as a function of phosphorus sources (single superphosphate and calcined bone meal) and rates (100, 200, and 400 kg ha -1 P2O5). The experimental design was a randomized complete block, in a 2x3+1 factorial scheme. The use of calcined bone meal yielded a dry matter (1.73 t ha -1 cutting -1 ) and a plant height (55 cm) higher than the control (1.03 t ha -1 cutting -1 and 35 cm, respectively). However, the values were lower than those obtained with single superphosphate (3.19 t ha -1 DM and 91 cm in height). Regarding the dry matter production in the experimental period (202 days, five cuttings), the calcined bone meal promoted 54% of the production obtained with the use of single superphosphate.Additional keywords: Nutrient cycling; Panicum maximum; phosphate solubility. ResumoA fim de apoiar ações de extensão rural para agricultura familiar na Amazônia Ocidental, avaliou-se a produção de Mombaça (Panicum maximum Jacq) em função de fontes de fósforo (superfosfato simples e farinha de ossos calcinada) e doses (100; 200 e 400 kg ha -1 de P2O5), em blocos casualizados, em esquema fatorial 2x3+1. O uso de farinha de ossos calcinada proporcionou produção de matéria seca (1,73 t ha -1 corte -1 ) e altura das plantas (55 cm) superiores aos da testemunha (1,03 t ha -1 corte -1 e 35 cm, respectivamente). Contudo, os valores foram inferiores aos obtidos com superfosfato simples (3,19 t ha -1 MS e 91 cm de altura). Em relação à produção de massa seca no período experimental (202 dias, cinco cortes), a farinha de ossos calcinada promoveu 54% da produção obtida com o uso de superfosfato simples.Palavras-chave adicionais: Ciclagem de nutrientes; Panicum maximum; solubilidade de fosfato.
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