N Mineralization of Cauliflower Residues and It's Effects on Yield and Nitrogen Uptake of Vegetables
ZHANG Hong-yan,CHEN Qing,TANG Li-ling,LI Xiao-lin,ZHANG Fu-suo (Department of Plant Nutrition, China Agricultural University, Key Laboratory of Plant Nutrition, MOA, Key Laboratory of Plant-soil Interactions,MOE, Beijing 100094,China)
N mineralization of cauliflower residues and it's effects on soil mineral N content, N nutrition and yield of vegetable (Amaranthus spp. )was studied in field. Three nitrogen treatments were included, such on Nt, Nr and Nr'.The N mineralization of cauliflower residues were 161.2%, 78.8% and 73.8% respectively for the three nitrogen treatments. The application of cauliflower residues increased soil Nmin concentration. However, it' s effects on yield and nitrogen uptake by amaranth vary among differnet nitrogen treatments. In Nt treatment with high N level, the application of residues has no significant effects on amaranth yield and nitrogen uptake, but in Nr and Nr' treatment with low N level, the application of residues significantly increased the yield and nitrogen uptake by amaranth.