Long-term Nutrient Management Network for Southern Buenos Aires Province

This project involves a series of on-farm field experiments with a common protocl looking for grain yield response to N, P, S, and other nutrients.

IPNI-2007-ARG-27

06 Jan 2009

2008 Annual Interpretive Summary


In 2007/08, IPNI and Agroservicios Pampeanos (ASP) established a network of field experiments with the objectives of: 1) determining direct and residual responses to N, P, S; 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, such as K, Mg, B, Cl-, Cu, and Zn.

Five sites were planted to full season soybean at Balcarce, Olavarria, Pieres, Tandil, and Tres Arroyos. Check yields varied from 1,190 to 3,811 kg/ha, and fertilized yields from 1,514 to 4,292 kg/ha. Two sites (Pieres and Tandil) showed significant yield responses to P+S (396 kg/ha), one site (Tres Arroyos) responded to P (550 kg/ha), one site (Balcarce) responded to S (436 kg/ha), and the fifth site (Olavarria) did not show a grain yield response to fertilizer treatment. Responses were related to low soil P and S availability. These sites will be planted to wheat/soybean in the 2008/09 season. Argentina-27