Fertilizer Formula on Yield of Onion in Qaidam Region

In Qaidam region,3414 fertilization formula test on onion was studied.The results showed that,in Qaidam region with the increase of fertilizer,onion production gradually increased,but when fertilizer increased to a certain extent,the yield of onion was decreased as the nitrogen continued to increase,the role of nitrogen on onion production ranks first,followed by phosphorus and potassium;nitrogen,phosphorus and potassium could increase onion production.Phosphorus and potassium had the best effects on onion yield,followed by were nitrogen and potassium, nitrogen and phosphorus.The best economic benefits of nitrogen,phosphorus and potassium application rate and the proportion of best fit and onion yields were nitrogen 28.3 kg/667m~2,pure phosphorus 22.7 kg/667m~2,the pure potassium 10.0 kg/667m~2,the best economic onion yield was 5 783.1 kg/667m~2.