翻压等量紫云英条件下不同化肥用量对土壤养分有效性及水稻产量的影响

在翻压等量紫云英条件下,研究了不同化肥用量对土壤养分有效性及水稻产量的影响.结果表明,早稻田翻压紫云英22500 kg/hm2后配施化肥,与施用100％化肥(MF100)相比,施用60％～80％化肥,土壤中碱解N、速效钾含量均有增加,增幅为10％～59％；施用40％化肥,土壤中有效磷含量显著增加25％ ～ 80％.翻压...

Effects of applying mineral fertilizer reasonably on the availability of soil nutrient and yields of rice under applying equivalent green manure

A field experiment was carried out to study the effects of fertilizing mineral fertilizer reasonably on the availability of soil nutrient and yields of rice under applying equivalent green manure.The results showed that compared with applying 100% mineral fertilizer under applying 22 500 kg/hm2 green manure,20%～40% of mineral fertilizer may be reduced which increased the content of available N,K by 10%～59% in soil,while reducing 60% mineral fertilizer increased available P by 25%～80% significantly.Moreover,higher effective ear number,ear grain number,filled-grain number and yields of early rice were observed when reducing 20% or so mineral fertilizer after turning under 22 500 kg/hm2 green manure,but decreased by 10%～24% of yields of rice significantly when reducing mineral fertilizer 40%～60%.