Effect of Potassium Application Rate on Absorption,Transport and Yield of Maize Potassium
To study the response of maize population dry matter,yield,nutrient absorption and transport to potassium,a field experiment was conducted in Pingjibao,Yinchuan City,Ningxia from 2018 to 2019,with 6 potassium fertilizer dosages of 0,60,120,180,240 and 300 kg/hm2.The results showed that potassium application significantly improved the dry matter accumulation,potassium absorption,transportation and utilization efficiency of corn.The best potassium application rate was 180 kg/hm2,and the dry matter accumulation in the mature stage increased by 3.04％to 13.80％compared to the control,while the potassium accumulation in the ear increased by 32.17％to 42.57％compared to the control.Under potassium application,the potassium transport amount increased by 20.28％-68.73％,the potassium transport rate increased by 10.16％-30.37％,and the contribution rate of transported nutrients to grains increased by 20.40％-67.71％.Compared with other potassium application treatments,the potassium absorption and utilization efficiency of 180 kg/hm2 increased by 20.09％-247.97％,the potassium agronomic utilization efficiency increased by 37.47％-221.27％,and the yield increased by 6.99％-18.14％.Taking into account factors such as corn yield,nutrient accumulation and transportation,and fertilizer utilization,the potassium application rate of 180 kg/hm2 was more suitable under the experimental conditions
potassium application amountdry matternutrient absorption and utilizationyield
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