Avaliação do efeito da aplicação de estrume de curral e combinação com NPK no rendimento do feijão verde (phaseolus vulgaris L.), no regadio de Mafuiane

Abstract

In order to evaluate the effect of cattle manure application on green bean (phaseolus vulgaris L. var. cotendar) yield and on some soil chemical characteristics, pH-H2O, exchangeable bases (BT), organic capacity (OM), Nitrogen total (Ntot) and assimilable phosphorus on March 28, 1997, on farms owned by peasants in Mafuiane village. Farms S9, S1 and F16, with red basaltic and lithic soils, were used for the study. Two repetitions and six different levels of fertilization were administered to the three farms; The levels of fertilization administered were as follows: control (C), 10 tons of bovine manure, (E1), 20 tons of bovine manure (E2), 10 tons of bovine manure+15 kg of N+30 Kg of p+ 15kg of K(EN2) and mineral fertilizer currently in use at the site 30kg of N+60kg of P+30kg of K(N)={from NPK 12:24:12}. Before fertilization, soil samples were collected 55 days after sowing (dds). Based on the simple orthogonal contrast method, the yield of fresh green bean vageri from the fertilizers significantly improved compared to the control (C). Mineral fertilization, N, resulted in significantly higher yield than fertilization with pure manure, EN1 and EN2. However, there were no significant differences between the mineral fertilizer, N, and the combined fertilizer EN1 and EN2. The combined manure and NPK fertilization, EN1 and EN2 treatments, not only significantly improved the level of organic matter M.O. on the ground; with Duncan's test at 5% significance level, but it also proved to be a good source of exchangeable cations, nitrogen, total (Ntot.) and assimilable phosphorus (Pass.). Low-income farmers can improve green bean, CTC and M.O yields by applying E1 treatment, and can obtain the highest gross margin by applying EN2 treatment.