Potassium Accumulation Characteristics and Suitable Potassium Application Rate of Maize under Full Straw Returning
To investigate the characteristics of potassium accumulation and yield changes in maize after long-term maize straw full deep-turning and returning to the field,in order to provide a theoretical basis for exploring the appropriate amount of potassium fertilizer for high-yielding spring maize populations under full straw returning con-ditions.This experiment was conducted in Gongzhuling City and Chaoyangpo Town,Jilin Province from 2017 to 2019 as a two-factor field trial.The main factor was potassium application level,and the secondary factors were maize hybrids,respectively.The results showed that the K45 treatment had the highest yield,number of harvested ears,number of grains and 100-grain weight,which increased by 10.4％,8.3％,9.0％and 14.4％,respectively,com-pared with the treatment without potassium fertilization.By fitting the data with a quadratic equation(y=-0.1375x2+23.594x+11 817,R2=0.873 2),it was found that the optimal economic potassium fertilizer application rate in the cen-tral maize-producing area of Jilin Province under the condition of long-term full-straw returning is 55.3 kg/ha,cor-responding to a yield of 12 700.9 kg/ha.
Spring maizeFull maize straw returningGrain yieldPotassium fertilizer amountPotassium ab-sorption
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万方数据
