Field Crop Response to Potassium on Soils with High Extractable Potassium and Varying Soil Supply Rates of Potassium
Crop responses to K on many western Canadian soils, even on soils testing high in K, have many people questioning the soil testing procedures used and/or the method by which K varies within fields. Using the Plant Root Simulator (PRS) probe, an ion exchange membrane system for measuring soil nutrient supply rate, a project was initiated in the semi-arid region of Saskatchewan to evaluate crop responses to fertilizer K on soils which are regarded as non-responsive using traditional K extraction methods.
IPNI-1999-CAN-SK23
15 Mar 2001
Objectives
- To investigate the potential for a K response in a Southern Saskatchewan field and to compare the abilities of conventional K extraction and K supply rate to predict yield responses to added K.