不同N,P,K配比的沼液肥对叶菜产量及品质的影响

摘要

Biogas slurry were combined with 4 different proportions of N,P,K in this experiment with raw biogas slurry as a control.The mixed fertilizer were sprayed on three kinds of leafy vegetables,i.e.Chinese cabbage,cabbage,and oil cabbage.The vegetable yield,VC,nitrate and pesticide residue contents were determined and compared,so that to find the best combined fertilizer.The results showed that all the 4 proportions of N,P,K combined biogas slurry had higher yield comparing with the control,but the nitrate content in vegetables also had a corresponding increase.The comprehensive comparison on yield and VC content showed that N∶ P∶ K ratio of 2∶1 ∶ 4 was relatively better,and then followed by 5∶1∶7.%试验以原沼液作对照,设置了4个不同N、P、K配比的沼液叶面肥共计5个处理,分别喷施在白菜、甘蓝及油白菜3种叶菜上.通过比较各处理对叶菜产量,VC,硝酸盐及农残含量的影响,探究出最佳的沼液叶面肥配方.结果表明:向沼液中加入不同比例的氮、磷、钾化肥后,其增产效果均高于原沼液,但叶菜中硝酸盐含量也相应提高.综合比较各处理的产量及VC含量,以N∶P∶K比例为2∶1∶4相对较好,为最佳配方,其次为5∶1∶7.