大白菜氮磷钾化肥效应研究

Effects of application of N,P,K chemical fertilizer on Chinese cabbage

结合大白菜营养吸收特性,探讨大白菜氮、磷、钾化肥配施效应。结果表明,在土壤有效N、K缺乏,有效P中等,有效B丰富的条件下,OPT-N、不施肥、OPT-K处理分别比OPT处理减产79.3%、78.3%及11.0%;种植效益降低327.2%、260.5%及32.9%。OPT-N处理与不施肥处理Vc与总糖含量均高于OPT最佳处理,相反硝酸盐含量低于OPT最佳处理,硝酸盐最高含量均未超过国标规定的最高限量值。在本试验条件下,每公斤氮、磷(P2O5)、钾(K2O)、硼肥养分大白菜产出率分别为327.4、-16.7、69.7、-36.0 kg。表明在中低产田种植大白菜时,更应重视氮、磷、钾、硼肥的合理平衡施用。

The effcets of application of N,P,K chemical fertilizer on Chinese Cabbage combined with the nutrient characteristic was studied.The result showed that while soil contained deficient N and K,medium P and rich B,the yield and plantation income were reduced 79.3% and 372.2% of the OPT-N treatment,78.3% and 260.5% of the CK treatment,11.0% and 32.9% of the OPT-K treatment.The vitamin C and total suggar content of the OPT-N treatment and the CK treatment was higher than the OPT treatment,and the nitrate content which did not exceed the highest limit value was lower by contraties.The output rate of N,P,K and B were 327.4 kg Chinese Cabbage/kg N,-16.7 kg Chinese Cabbage/kg P2O5,66.7 kg Chinese Cabbage/kg K2O and-36.0 kg Chinese Cabbage/kg B.So we should attach importance to the balance of N,P,K and B fertilizer in the medium and low yield.