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%.