The influence of superphosphate fertilizer on the yield and uptake of phosphorus by wheat

The yield of dry matter at ear-emergence was greatly influenced by the amount of superphosphate applied. The grain yield at harvest was not affected so greatly. Superphosphate had an effect on the proportions of the plant parts. The uptake of phosphorus proceeded at a greater rate during later stages of growth and still continued during the pre-flowering and early post-flowering stages. The effect of differential uptake of phosphorus by the various plant parts on the residual value of the fertilizer is discussed.