Studyon the Relationship between Nitrogen,Phosphorus and Potassium Proportional Fertilization and Yields in the main pear production Areas in China
In order to analyze the improvement of pear tree yield by matching nitrogen,phosphorus and potassium fertilization in major pear fruit producing areas in China,the correlation analysis of nitrogen,phosphorus and potassium fertilization and yield in major pear producing areas in China was carried out based on the relevant literatures of matching fertilization in pear trees in China.The results showed that the average ratio of nitrogen,phosphorus and potassium fertilizer was 1∶0.66∶0.66 in the main producingareas of pear fruit in China,whereasthe average yield was 31.66 t/ha.The average ratios of nitrogen,phosphorus and potassium fertilizer in the four pear producing areas,i.e.,North China,the Yangtze River Basin,Northwest China,and the old Yellow River Channel,were 1∶0.62∶0.79,1∶0.57∶0.85,1∶0.81∶0.32 and 1:0.56:0.79,respectively,and the average yields were 42.85 t/ha,31.58 t/ha,15.78 t/ha and 38.76 t/ha,respectively.By the yield model,it showed that the contribution degree of each factor to yield was K>P>N,whereas the interaction effects of nitrogen,phosphorus and potassium on yield were P×K>N×K>N×P.The contribution degree of nitrogen,phosphorus and potassium to the yield of pear fruit in four main producing areas of China was K>N>P,P>N>K,K>N>P and N>P>K,respectively,the interaction effects of nitrogen,phosphorus and potassium on yield of pear fruit in four main producing areas of China were N×P>N×K>P×K,N×P>N×K>P×K,N×P>N×K>P×K and N×K>P×K>N×P,respectively.The factors that affect the yield of pear trees in various production areas in China are not the same,and the input of fertilizers is also different.The pear production areas in North China,the Yangtze River Basin,and the Yellow River Old Channel focus on nitrogen and potassium input,while the pear production areas in Northwest China focus on nitrogen and phosphorus input,which is related to the conventional fertilization and soil nutrients in each region.Therefore,in the cultivation process of pear trees,the local soil fertility factors should be fully considered,and the matching fertilization can effectively improve the yield of pear trees.
Main pear production areaNitrogenPhosphorus and PotassiumProportional fertilizationYield
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