平衡施肥有机肥及几种化学药剂对小白菜产量和品质的影响

采用田间试验的方法研究了有机肥、DCD和复合剂(草酸、甘氨酸、KCl)对小白菜产量及品质的影响。结果表明,施用适量的有机肥显著提高了蔬菜产量与可溶性糖含量。与对照相比,有机肥使蔬菜中硝酸盐积累降低18.36%,而对蔬菜营养品质无显著影响;施用双氰胺和采收前喷施草酸、甘氨酸、KCl复合剂均显著减少蔬菜对硝酸盐的积累,分别使小白菜硝酸盐含量降低了7.64%,11.77%,且对产量和品质无明显不良影响;小白菜的硝酸还原酶活性在喷施草酸、甘氨酸、KCl复合剂后显著提高。可见,在大田生产条件下,在适量施用有机肥的基础上,配合施用DCD或采收前喷施草酸、甘氨酸、KCl复合剂是提高蔬菜产量,降低硝酸盐含量的一项有效措施。

Effects of Organic Fertilizer and Some Chemical Agents on the Yield and Quality of Pakchoi

A field experiment was conducted to study the effects of organic fertilizer, DCD and the compound agents of oxalate, glycine (Gly) and KCl on the yield and quality of pakchoi. The results showed that the yield and soluble sugar content of pakchoi were increased drastically through applying right amount organic fertilizer. Applying organic fertilizer could reduce nitrate accumulation by 18.36% compared to the contrast, but the nutrient quality was not affected significantly by the application of manure. Moreover, nitrate content was reduced by 7.64% and 11.77% respectively through applying DCD in soil or foliar spraying compound agents of oxalate, Gly and KCl before harvest, while the yield and quality were not affected significantly. On the other hand, foliar spraying compound agent increased Nitrate reductase activity (NRA) in pakchoi. These results suggested that the corporation of DCD or foliar spraying compound agents of oxalate, Gly and KCl before harvest is available to raise yield and drop nitrate content in pakchoi on the basis of right amount organic fertilizer application in field.