Response of high yield wheat to phosphorus and potassium and proper ratio of N, P and K

The influence is estimated, on wheat growth with different dosage and proportion of phosphorus potassium, and under proper nitrogen application for alluvial calcareous soil at Huangfan area. The results show that (1)best effect consists in a medium phosphorus application (120 kg P2O5/hm2) for yields increasing by 30.82% or 20.27%, compared with no or low phosphorus application (48 kg P2O5/hm2). A high phosphorus application (192 kg P2O5/hm2)makes yield only increase by 2.85%,compared with a medium phosphorus application; (2)the effect of potassium for wheat is inferior to that of phosphorus, its activity is prompted on the basis of phosphorus together with potassium application; (3)best proportion of nitrogen, phosphorus potassium 1∶0.5∶0.5 for wheat in its growth period, and application of 240 kg N/hm2, 120 kg P2O5/hm2 and 120 kg K2O/hm2 bring the highest benefit.