ratio of base and topdressing 第1页

Effects of nitrogen application rate and ratio of base and topdressing on nitrogen absorption,utilization,grain yield,and grain protein content in winter wheat The effects of top-dressing to basal nitrogen ratios on grain yield and quality of winter wheat under heat stresses during grain Filling Effects of nitrogen fertilizer rate and ration of base and topdressing on yield of wheat, content of soil nitrate and nitrogen balance