Establishing a Plant Nutrition Network for the CREA Region in Southern Santa Fé

On-farm field experiments establish as a long-term network in 2000, to evaluate responses to N, P, and S in wheat, soybean, and maize in the southern Santa Fe and Southeastern Cordoba regions. Evolution of soil properties are evaluated periodically in teh different treatments.


15 Jul 2002

2001 Annual Interpretive Summary

In collaboration with AACREA, a farmer organization operating in southern Santa Fe, a number of field experiments were established to:1) determine direct and residual responses to nitrogen (N), phosphorus (P), sulfur (S), and other nutrients [potassium (K), magnesium (Mg), boron (B), copper (Cu), and zinc (Zn)], 2) evaluate recommendation methods for N, P, and S fertilization, and 3) evaluate deficiencies and potential responses to nutrients other than N, P and S.

In 2000/01, the first crop in the rotation was corn. Average yields for the six treatments evaluated in eight experimental sites were as follows: Check 7,700 kg/ha; PS 8,200 kg/ha; NS 9,500 kg/ha; NP 9,700 kg/ha; NPS 10,000 kg/ha; and NPSKMg+micros 10,000 kg/ha. Significant responses were found in seven of eight sites for N, five of eight sites for P, and four of eight sites for S. There were no significant responses to the KMgS+micros combination. Nitrogen responses were related to pre-plant and sixth plant node stage (V6) soil, nitrate (NO3) availability, and stalk NO3 concentration at V6. Phosphorus responses were related to Bray P levels, and S response to pre-plant sulfate levels at 0 to 20 cm. This network of experiments will continue through 2004/05. ARGENTINA-12