Crescimento e nutrição da braquiária em função de fontes de fósforo

• Autor(a) principal: Costa, Sérgio Ely Valadão Gigante de Andrade
• Data de Publicação: 2008
• Outros Autores: Furtini Neto, Antônio Eduardo, Resende, Álvaro Vilela de, Silva, Tácio Oliveira da, Silva, Talles Renan da
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UFLA
• Texto Completo: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542008000500010; http://repositorio.ufla.br/jspui/handle/1/6780
• topic: Índice de eficiência agronômica; Matéria seca; Acúmulo de fósforo; Agronomic efficiency index; Dry matter; Phosphorus accumulation

The contribution of different phosphorus (P) sources applied, under greenhouse conditions, in a clayey dystrophic Red Latosol - Oxisol (LVdf)(350 mg dm-3 of P2O5) and a sandy Neosol - Entisol (NQ)(200 mg dm-3 of P2O5), collected from Lavras (MG) and Itutinga (MG) counties, respectively, on Braquiaria's (Brachiaria brizantha cv. Marandu) dry matter production, P content and accumulation were evaluated. Also agronomic efficiency index (AEI) of the P sources applied was measured. The experiment was carried out under a completely randomized 4x2 factorial, comparing four P sources (Triple superphosphate - TS, Arad reactive phosphate - RP, Araxá rock phosphate - AP, and a 1:1 ratio mixture TS+RP), with four replicates. The amount of P applied was based on the P2O5 content of each source. The forage was cultivated for four cuts. For total dry matter production and P accumulation, P sources of higher solubility, as TS, RP and TS+RP were more efficient, especially for the first, third and forth cuts in the LVdf soil and for all cuts for the NQ soil. By the last cut, Braquiaria's total P content was higher when RP and TS+RP sources were applied for the LVdf soil and TS and TS+RP for the NQ soil. The different P sources had influence on AEI on both soils, for the LVdf soil as for the NQ soil P sources of higher solubility (RP and TS+RP) presented higher AEI.