Modelo de fertilización nitrogenada y fosforada para trigo en el Sudoeste Bonaerense, Argentina

摘要: In the southwest of Buenos Aires Province (Argentina) nitrogen and phosphorus deficiencies are important wheat yield limiting factors. The objective this paper was to develop a model which predicted response (0 60 kg N ha-1), applied at two different times (sowing or tillering) in split application, include interaction with (16 P seed. For each 19 experiments, placed on farmers’ fields, function form y = b0 + b1Ns b2 Nm b3 Ns 2 b4 b5 NsxNm b6 b7 NsxP b8 NmxP b9 NsxNmxP, fitted. equation denotes yield; P, fertilizer rates; subscripts s m, time application b9, coefficients. Dependent variables interactions were derived from equation. Independent pH, organic matter (MO) soil extractable (BK). Dummy texture, cycle climatic year also included. Yield depended mainly BK, respectively, as shown previous papers. Interactions accounted for ± 500 ha-1. N-P greater soils low cultivars intermediate short vegetative cycle. Interaction between fractions related pH higher potential cultivar. results indicate that it is more convenient rate, particularly long cultivars.