Abstract: Field experiments were conducted to investigate the impacts of different controlled release fertilizer types with single basal application on yield,NUE,quality of Chinese cabbage(Brassica penkinensis.).Controlled release fertilizers included urea formaldehyde,linear and sigmoid coated urea.Comparing to conventional N application rate of 300kg/ha as urea,urea formaldehyde,linear and sigmoid coated urea were applied at rates of 300,240(20% reduction) and 225kg/ha(25% reduction) respectively,and in the treatment with sigmoid coated urea,applied chemical N fertilizer is a mixture including 33% of urea and 67% of sigmoid coated urea.The results showed that N application(organic manure or chemical N fertilizer) increased the yield of Chinese cabbage,organic manure addition resulted in 8.22% yield increase,however,on the basis of organic manure,the yield was not increased remarkably with chemical N fertilization,the yield with urea,urea formaldehyde,linear and sigmoid coated urea increased 1.2%,4.27%,4.62% and 4.97% respectively.NUE of organic manure was 33.0%,whereas,on the basis of organic manure,NUE decreased with chemical N fertilization,NUE with urea was lower than 1%,for urea formaldehyde,linear and sigmoid coated urea,NUE was 8.9%,8.4% and 13.1% respectively.N fertilization had negligible impact on quality of Chinese cabbage,no significant difference of nitrate and vitamin C content was observed among all the treatments.

Key words: Chinese cabbage, Urea formaldehyde, Coated urea, Yield, Quality, NUE

CLC Number: 

• S634.1