Effects of Organic Fertilizer Application and Potassium Fertilizer Operation on Potato Yield in Northern Shaanxi
In order to explore the effects of combined application of organic fertilizer and potassium topdressing ratio on the potato yield in northern Shaanxi,the local main cultivar named'Kexin No.1'was used as the test material in this experiment,and field plot experiments were carried to study the potato yields from six groups with different treatments under the same conditions in the to-tal amount of fertilizer,according to the base fertilizer and topdressing amount of potassium fertilizer and the combined application of organic fertilizer,the six treatments were as follows,i.e.,T1(conventional fertilization),T2(3/4 base fertilizer+1/4 trodressing+25％organic fertilizer),T3(3/4 base fertilizer+1/4 trodressing+50％organic fertilizer),T4(1/2 base fertilizer+1/2 trodressing+25％organic fertilizer),T5(1/2 base fertilizer+1/2 trodressing+50％organic fertilizer),and T6(CK no fertilization).The results showed that,combined application of organic fertilizer could significantly improve the plant height,stem diameter and dry matter weight of potato,increased the number and weight of potato per plant,and improved the commercial potato rate of potato.The com-mercial potato rate of T2～T5 treatment ranged from 86.80％to 90.37％,which was significantly higher than that of T1 and T6 treat-ments.The weight of potatoes per plant was the largest in T5 treatments,which was increased by 24.37％and 17.66％compared with that of CK and conventional fertilization,respectively.From the yield results,the highest yield of T5 treatment was 1 219.92 kg,which increased by 29.90％and 52.32％compared with T1 and T6 treatments,the higher yield of T4 treatment was 1 123.79 kg,which increased by 19.67％and 40.32％compared with T1 and T6 treatments.Therefore,in northern Shaanxi,the potato organic fertilizer application of 25％～50％,potash fertilizer 1/2 as base fertilizer,1/2 as topdressing yield effect was the best.
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