1.果树施肥的关键时机应根据果树各个生育阶段所需肥料的特点和需肥规律,全年可分5次追肥。(1)开花前追施保花肥。果树萌芽、开花期消耗的自身养分较多,如果上年树体贮存的养料不足,养分供应不及时,就会使花期延长并降低坐果率。因此,在开花前应适量追施速效肥,即追施全年氮肥? 1. The key timing of fruit tree fertilization should be based on the characteristics of the fertilizers required by the various stages of fruit tree growth and fertilization rules throughout the year can be divided into 5 top-dressing. (1) Top dressing fertilizer before flowering. Fruit tree buds, flowering consume more nutrients themselves, if the last year the tree storage of nutrients, nutrient supply is not timely, it will extend the flowering and reduce the rate of fruit set. Therefore, before flowering should be topdressing effective fertilizer, topdressing nitrogen fertilizer throughout the year?