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- W2351204177 abstract "Split plot experiment design was used to study nitrogen fertilizer requirement and utilization ratio of main cultivars of rice in the cold area.The results showed that the yield of treatment three was the highest,yield per mu was 640.5 kg,next came treatment five,yield per mu was 573.9kg.The yield contribution rates of fertilizer decreased with the increase of N fertilizer application rate.The yield contribution rates was the best with nitrogen rate of 7 kg/667m2.Utilization ratio of kongyu 131 and longjing 20 was the highest with N application of 9.1 kg per mu,and attained 31.0% and 36.1% respectively,its basic amounts of soil nitrogen supply were 4.76 kg/667m2 and 4.29 kg/667m2 respectively.The relation between quantity of nitrogen fertilizer and yield of kongyu 131 was y=-0.8236x2+22.556x+425.18,R2=0.5397,F=5.275,F0.05(2,11)=3.98,and FF0.05(2,11),coefficient of one degree term was positive,the quadratic coefficient was negative,so equation was established.The fertilizer rate of longjing 20 with the highest yield was 10.97 kg/m2,the highest yield was 859.9 kg/m2,and when the optimum yield apply fertilizer was 9.86kg/m2,it's output was 801.1kg/m2." @default.
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- W2351204177 date "2009-01-01" @default.
- W2351204177 modified "2023-09-24" @default.
- W2351204177 title "Nitrogen Fertilizer Requirement and Utilization Ratio of Rice Production in the Cold Area" @default.
- W2351204177 hasPublicationYear "2009" @default.
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