Nutrient Management Strategies for Sichuan
IPNI-1999-CHN-SC18
12 Jan 2005
2004 Annual Interpretive Summary
Nutrient Management Strategies for Sichuan, 2004
This third year of field trials continued the process of verifying soil nutrient limitations for two monitored villages. All years have provided crop-specific examples of nutrient limitations. In the wheat-corn rotation system at Jianyang, nitrogen (N) continues to be most limiting for wheat, followed by phosphorus (P) and manganese (Mn). In corn, N, P, and potassium (K) were the three most yield-limiting nutrients. In the wheat-rice rotation system at Chongzhou, N, K, and P were severely limiting for both wheat and rice. A seasonal effect is apparent since P deficiency was most severe for wheat in winter, while K deficiency was most severe for corn and rice in the summer. The - P treatment reduced wheat yield by 13% at Chongzhou and by 9% at Jianyang, while the - K treatment reduced corn yield by 38% at Chongzhou and by 11% at Jianyang.
The study provides a better understanding of both the soil nutrient status and crop response to applied P and K fertilizers, and thus gives local technicians and planners insight into the crop- and season-specific nutrient management strategies for two important landscape types in Sichuan. Sichuan-NMS01