The Regional Consortium of Agricultural Experimentation (CREA), a farmer organization based in Southern Santa Fe, has collaborated with IPNI to establish a network of field experiments with the objectives of: 1) determining direct and residual responses to N, P, S, and where indicated, to K, Mg, B, Cu, and Zn; 2) evaluating recommendation methods for N, P, and S fertilization; and 3) identifying the level of deficiency and potential response to nutrients other than N, P, and S.
In 2007/08, three sites within a corn-wheat/soybean (C-W/S) rotation were planted to wheat/soybean, and four sites within a corn-soybean-wheat/soybean (C-S-W/S) rotation were planted to full season soybean.