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Abstract
The effects of rate and placement of superphosphate, Calciphos, and a blend of 82% superphosphate: 18%Calciphos on phosphorus responses by white clover were examined in a pot trial using a high phosphate-fixing Te Anau soil and a low phosphate-fixing Lismore soil. Marked P responses occurred. Superphosphate was the most effective treatment, with yields from the blend being significantly lower. This was related to blending causing a decrease in the amount of soluble P. Calciphos was the lowest yielding treatment and was more effective on the Lismore soil than the Te Anau soil. Surface applications of superphosphate and the blend were superior to mixing, particularly for the Te Anau soil. However, mixing of Calciphos was higher yielding than surface application for the Lismore soil, but there was no difference for the Te Anau soil. Initial yields obtained from mixing Calciphos with the soil relative to surface applied superphosphate were 31 and 73% for the Te Anau and Lismore soils respectively, but relative differences decreased with time. The application of lime caused a 20% reduction in the white clover yield obtained after Calciphos application in the Te Anau soil.