黑土区组合施肥技术对土壤氮磷的影响

定位试验研究有机肥、生物肥和化肥组合施肥技术对土壤N、P养分元素的影响结果表明,组合施肥较单施化肥土壤全N增加0.05g/kg,速效氮(除Ⅱ处理)增加6.6～44.6mg/kg,土壤全P增加0.15～0.29g/kg,速效磷增加15.68～51.07mg/kg。组合施肥较单施化肥土壤N素增量全N增加0.2～0.25g/kg,速效氮增加11.6～39.4 mg/kg,全P增加0.09～0.24g/kg,速效磷增加23.59～57.82mg/kg。组合施肥较单施化肥净收入高19.4％～37.3％。

Effect of combined fertilization techniques on nitrogen and phosphorns in soil in the black soil region

In this experiment,the effects of fertilization techniques combined with organic manure,biological fertilizer and chemical fertilizer on nitrogen and phosphorus in the soil are investigated.The results show that compared with single chemical fertilizer,soil full nitrogen content in every treatment of combined fertilizers increases by 0.05g/kg,rapidly available N increases by 6.6~44.6mg/kg except for the treatment D,soil full phosphorus content increases by 0.15-0.29 g/kg,rapidly available phosphorus increases by 15.68~51.07mg/kg;the recruitments of full nitrogen and rapidly available nitrogen increase by 0.2~0.25g/kg and 11.6~39.4mg/kg,respectively,and full phosphorus and rapidly available phosphorus increase by 0.09-0.24g/kg and 23.59~57.82mg/kg,respectively.The economic benefits (net income) in every treatment increase by 19.4%-37.3% compared with the control group.