Effects of Green Fertilizer Winter Rape Multi-cropped in Leisure Period on Nitrogen and Phosphorus Utilization Efficiencies and Yields of Spring Wheat in Dryland Areas of Central Gansu
Nitrogen and phosphorus play an important role in the formation of spring wheat yield.In order to improve the uptake and utilization of nitrogen and phosphorus in spring wheat,field experiments were conducted to study the effects of planting and pressing winter rape in leisure period on wheat yield and nitrogen and phosphorus uptake and utilization efficiency of wheat grain and straw.The results showed that the biomass and grain yield of spring wheat increased by 23.03% and 17.68%,respectively.Nitrogen content in grain and straw decreased by 5.44% and 27.39%,respectively.Nitrogen uptake in straw decreased by 8.69%,and nitrogen uptake in grain increased by 11.29% .Phosphorus content in grain increased by 11.35%,phosphorus content in straw decreased by 10.00%,and phosphorus uptake in grain and straw increased by 30.84% and 12.50%,respectively.Nitrogen partial productivity and nitrogen use efficiency increased by 17.65% and 12.18%,respectively,phosphorus partial productivity increased by 17.65%,and phosphorus use efficiency decreased by 5.34% .In conclusion,multiple planting of winter rape as green fertilizer during fallow period can improve the phosphorus content,nitrogen and phosphorus uptake,nitrogen and phosphorus fertilizer partial productivity and nitrogen use efficiency of wheat grains,and then effectively increase wheat yield.
Green fertilizer winter rapeSpring wheatNitrogen use efficiencyPhosphorus use efficiencyYield
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