Study on Effect of K Fertilizer Application on Yield Increase in Cabbage in Spring

[Objective] The study was to investigate the technique of K fertilizer for high yield in cabbage.[Method] With the cabbage variety Chungan 8398 as tested material,5 treatments of N fertilizer with 2 levels(225,300 kg/hm2) and K fertilizer with 3 levels(0,225 and 338 kg/hm2) were designed.The plant height,number of leaf,degree of outspread,weight per ball,leaf weight,root weight,biomass yield per plant and net vegetable rate were measured in harvest stage.[Result] Applying K fertilizer on the base of N and P fertilizers could significantly increase the growth of cabbage in spring.When K fertilizer was applied below 338 kg/hm2,the plant height,weight per ball,root weight,biomass yield per plant and net vegetable rate were increased with the increment of K fertilizer dosage.The average yield in treatment applied K fertilizer was increased by 33.8% in 1999 and by 27.7% in 2001.The treatment of applying K fertilizer could increase 2 190-3 090 yuan/hm2 in average and make the output-input ratio of 3.85-5.19∶1.[Conclusion] Applying K fertilizer could greatly increase the cabbage yield and economic benefit.