Study on Application Technique of High Efficient K Fertilizer on Chinese Onion

[Objective] The study aimed to research the effect of K fertilizer on yield and quality of Chinese onion.[Method] With Huangling Chinese onion as material,on the basis of equivalent P fertilizer amount,2 levels of N fertilizer(225 and 375 kg/hm2),3 levels of K fertilizer(0,225 and 337.5 kg/hm2) were matched into 6 treatments of NK fertilizer so as to study the effect of K fertilizer on yield and quality of Chinese onion.[Result] It had obvious promoting effect on the growth of Chinese onion when K fertilizer was applied on the basis of NP fertilizer application,and the plant height,tiller number,length of onion white,diameter of onion white and fresh weight per plant were all increased with the increment of K fertilizer rate.Among 6 treatments,Chinese onion yield was increased by 12.1%-17.6%.The Vc content and soluble sugar content was increased significantly and the nitrate content was decreased significantly when K fertilizer was applied.Under 2 levels of N fertilizer,the increased income were 7 088-9 800 yuan/hm2 and 8 050-10 850 yuan/hm2 resp.when K fertilizer was applied.[Conclusion] The yield,quality and economic benefit of Chinese onion could be increased when K fertilizer was reasonably applied on the basis of NP fertilizer application.