Dynamics of Phosphorus Accumulation and Utilization Efficiency of Winter Wheat on Dry Highlands of Loess Plateau

Studies regarding plant phosphorus accumulation and utilization efficiency can provide scientific basis for reasonable application of phosphate.Dynamics of phosphorus content of winter wheat and utilization efficiency of winter wheat was conducted based on the long-term positional fertilization experiment on dry highland of the Loess Plateau.The results show that the phosphorus contents of winter wheat plants with application of phosphate fertilizer presented a V shape curve.Phosphorus contents of winter wheat were high during the early growth period,and decreased with the crop growth,and reached the minimum in the filling stage,and then rebounded in the last stage.Phosphorus of winter wheat accumulated mainly in two stages,i.e.,stage of jointing—flowering and stage of filling—mature.Sufficient supply of phosphorus in these two stages could ensure better growth of winter wheat.In terms of phosphorus utilization efficiency,yield and other indicators,phosphate application should be controlled in a reasonable range between 45～90 kg/hm2 in the scenario of nitrogen application 90 kg/hm2.