Effects of Different Nitrogen Forms and Ratios on Yield,Quality,and Nutrient Uptake of Mini Chinese Cabbage

A field experiment was conducted to study the effects of different nitrogen forms and their ratios( nofertilize,NO-3-N∶ NH+4-N ratio 10 ∶ 0,7 ∶ 3,5 ∶ 5,3 ∶ 7,0 ∶ 10,CO( NH2)2-N,local traditional fertilizing amount) on the yield,quality and nutrient( N,P,and K) absorption of Mini Chinese Cabbage. The results were as follows: In different ratio of NO-3-N∶ NH+4-N,when NO-3-N∶ NH+4-N for 5 ∶ 5,the yield and economic benefit could improve significantly. The nitrate content was increased with increasing nitrate-N,decreasing ammonimn-N. The soluble protein content,the soluble sugars content and the soluble solids were promoted with increasing ammonimn-N. When the NO-3-N∶ NH+4-N ratio was ranged from 3 ∶ 7 to 0 ∶ 10,respectively,the accumulation of nitrate in Mini Chinese Cabbage was reduced,while the soluble sugars content was promoted. When the NO-3-N∶ NH+4-N ratio was ranged from5 ∶ 5 to 3 ∶ 7,as well,the soluble protein content could be promoted. CK2( local traditional fertilizing amount) and T4( NO-3-N∶ NH4 +-N ratio 3 ∶ 7) were good for increasing the soluble solids content. N fertilization increased the absorption of N,P and K in plants. Throughout the entire growth period,NH+4-N fertilization improved the plant N content,whereas NO-3-N fertilization improved the plant K content. At different growth stages,the effects of different N sources on plant P content varied. It was suggested that the NO-3-N∶ NH+4-N ratio ranged from 5 ∶ 5 to 3 ∶ 7 could improve the quality and economic return of Mini Chinese Cabbage.