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在作物生长期间施肥,统称为追肥。广义而言,追肥包括根部追肥和根外追肥。前者是主要的,后者是辅助性的。通常所说追肥实际上是指根部追肥。追肥一般在作物即将或开始进入旺盛生长的时期进行,其目的主要是满足作物在氮素最大效率期对氮素养分的大量需要,以施用氮肥或配合施以腐熟粪尿肥、沼气池肥等为主。根外追肥则多在苗期或作物生长后期,可施用的养分种类多,但数量都不大,且不一定非施不可。特别是微量元素,不缺最好不施,更不可多施。
Fertilize crops during growth, collectively referred to as top dressing. Broadly speaking, top dressing includes top dressing and top dressing. The former is the main, the latter is supporting. The so-called top-dressing is actually referring to the top dressing. Top-dressing is generally carried out at a time when the crop is about to begin its vigorous growth. Its purpose is mainly to meet the large amount of nitrogen needs of crops in the period of maximum nitrogen efficiency, to apply nitrogen fertilizers or to mix them with decomposed manure, biogas digesters, etc. Mainly. Root top dressing is more in the late seedling or crop growth, can apply more types of nutrients, but the quantity is not large, and not necessarily unscrupulous. In particular, trace elements, no shortage of best not to apply, but not to be applied.