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根外营养即根外追肥、叶面喷洒。是一种由叶部直接供给作物以有效养分,防止养分施入土壤时被固定而降低其有效性的一种好方法。尤其对铜、锰、锌、铁等易被土壤固定的元素,采用叶面喷洒,效果会显著提高。但叶面营养只是一种辐助性的吸收方式,不能完全代替土壤营养。只是在植物生长过程中出现缺素症、生长后期根系吸收养分能力减弱或因某种特殊情况需要补给养分时,才应用叶面施肥。在进行叶面追肥时应注意以下几点:
Root nutrition outside the top dressing, foliar spray. It is a good way to supply crops directly from foliage for effective nutrients and to prevent nutrients from being immobilized when they are applied to the soil, reducing their effectiveness. Especially for copper, manganese, zinc, iron and other easily fixed elements of the soil, the use of foliar spray, the effect will be significantly improved. However, foliar nutrition is only a radiating absorption method, can not completely replace soil nutrition. Only plant growth appears in the process of the lack of disease, the late growth of the ability of the root to absorb nutrients weakened or because of special circumstances need to supply nutrients, the application of foliar fertilizer. In the leaf top dressing should pay attention to the following points: