Soybean fertilization management in Argentina
Fertilizer use in soybean has been historically low in Argentina, and adequate nutrient management could contribute to future increases in grain yield in most regions. This paper and presentation summarize the results of investigations and experimentations on soybean fertilization management carried out in the last years. Most of the soils under soybean production have N, P and/or S deficiencies. Seed inoculation with Bradyrhizobium bacteria is a generalized practice. Soybean yield response to P fertilization is related to soil Bray 1 P content and current critical levels are between 10 and 14 mg/kg Bray P. Sulfur recommendations are based on previous field history and management since responses are not strongly related to soil sulfate-S concentrations at planting. Recent experiments have not shown generalized responses to nutrients other than N, P or S. Research has shown high residual effects of P and S applications in wheat for the next double cropped soybean crop. Significant interactions among deficient nutrients applied through fertilization (P and S) or supplied by biological fixation (N) are observed in double cropped and full season soybeans.
Paper (940 KB) 
Presentation (5.3 MB) 
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