Surface Broadcast and Incorporated Lime: Impact on Soil pH, Soil pH Distribution and Soybean Yield Response to Fertilizers
IPNI-1998-CAN-ON19
30 Mar 1999
1998 Annual Interpretive Summary
Surface Broadcast and Incorporated Lime: Impact on Soil pH, Soil pH Distribution and Soybean Yield Response to Fertilizers, 1998
In recent years, the Ontario soybean crop has expanded to exceed the acreage of corn. Yet, compared to corn, far less research has been done on its phosphorus (P) and potassium (K) needs. Soybeans are more frequently planted with reduced or no tillage, and this raises further questions regarding optimum placement of P and K and its interaction with lime. The objective of this project is to determine the rate of reaction and depth of influence of lime in soil under reduced tillage systems, and to assess its effect on soybean yield response to applied nutrients. This study is being carried out with funding from the Fertilizer Institute of Ontario, the Canadian Fertilizer Institute, and three soil testing laboratories: Agri-Food Laboratories, Guelph; A&L Canada Laboratories East, London; and Stratford Agri-Analysis, Stratford.
At one of the three sites in 1998, a 0-30-70 lb/A N-P2O5-K2O rate of starter fertilizer increased soybean yield by 29 percent. Analysis of interaction between applied fertilizer and soil pH is continuing, and monitoring of soil pH changes will continue in 1999. ON-19