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
26 Dec 2009
2009 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, and S; 2) evaluating recommendation methods for N, P, and S fertilization; and 3) identifying the level of deficiency and potential responses to nutrients other than N, P, and S, such as K, Mg, B, Cl-, Cu, and Zn.
Four sites were planted to barley at Olavarria, Pieres, Tandil, and Tres Arroyos during the 2008/09 growing season. Check yields varied from 2,970 to 3,730 kg/ha, and fertilized yields varied from 2,830 to 6,190 kg/ha. Responses to P were significant at three of the four sites (Olavarria, Pieres and Tres Arroyos), with average yield increases between 560 to 2,620 kg/ha. The Pieres site showed a significant response to NPS (+1,320 kg/ha). Phosphorus responses were related to low soil Bray-1 P levels, as all sites were below 16 mg/kg, and the dry conditions that prevailed during most of the 2008/09 growing season. Responses to N, S, and other nutrients were variable and not significant at any site. These sites will be planted to soybean during the 2009/10 season. Argentina-27