最大肥效期,就是在施肥量相同的情况下,所获得的增产效果最大的时期。据长期研究的结果证明,苹果的最大肥效期,在花芽分化以前(一般是6月份).抓紧在这个时期,适量追施速效性氮肥,往往会收到促进花芽分化和增加产量的显著效果。但是,不同的苹果品种,不同生长结果状况的树,特别花多,花少不一样的结果树,对肥料的需求情况也就有所差别。在苹果生产中,常常根据树上花量的多少,确定 Maximum fertilizer period, that is, the same amount of fertilizer in the case of the yield-maximizing period obtained. According to long-term study results show that the maximum effective period of apple, flower bud differentiation (usually in June.) Seize up in this period, the amount of topdressing quick-acting nitrogenous fertilizer, often will receive the promotion of flower bud differentiation and increase yield significant effect. However, the different apple varieties, the trees with different growth status, the special flowers and the different results trees, the demand for fertilizer is also different. In the production of apples, it is often determined according to the amount of flowers on the tree