作物叶面追肥是一项经济有效的施肥措施。它不仅可快速补充作物生育期间所需养分,对作物某些缺素症或因遭受自然灾害需要及时补救有重要作用。特别是在作物生育后期,根系老化,吸收能力弱,及时叶面施肥,可避免作物脱肥早衰所导致的减产。而且肥料利用率高(其效率为土壤施肥的6~20倍)。但要施好叶面肥,还要掌握一定的技术要点。一、最佳喷施时间不同的作物有不同的最佳喷肥时间,喷早了,叶面窄吸肥少,浪费多,效果不理想,喷迟了叶片退黄老化,吸肥功能低有些作物喷迟了还会造成贪青晚熟,影响产量和降低商品价值。根据 Crop foliar fertilizer is a cost-effective fertilization measures. It can not only quickly replenish the nutrients needed during crop growth, but also play an important role in some crop deficiency diseases or the need for timely recovery due to natural disasters. Especially in the late crop growth, root aging, weak absorption capacity, timely foliar fertilization, crop premature failure can be avoided to reduce production. And high fertilizer utilization (the efficiency of soil fertilization 6 to 20 times). But to apply good foliar fertilizer, but also master certain technical points. First, the best time to spray different crops have different best time to spray, spray early, the foliar absorption of less fat, more waste, the effect is not satisfactory, late spraying yellow leaves aging, low fat absorption some A late crop can also cause late blooming and late blooming, affecting yields and lowering the value of commodities. according to