Study on Nitrogen Application for High Yield and Excellent Quality in Chinese Cabbage

The effect of nitrogen on the yield and quality was studied in Chinese cabbage (Brassica campestris ssp. Pekinensis). The results showed that the yield of Chinese cabbage was the highest in the level of 270 kg/hm2, and there was second correlation between the yield and nitrogen applied (R2=0.982 3). The SPAD value and the nitrate, total nitrogen and water content was increased with the nitrogen applied, however the soluble sugar, soluble protein, titratable acid contents and sugar-acid ratio was decreased. As a result the optimal nitrogen applicant was 180-270 kg/hm2. The contents of VC, soluble sugar, water and SPAD value were increased at first and thereafter reduced. And the high nitrogen treatments changes greatly than low nitrogen treatments.