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叶类蔬菜具有生长快,需氮量大,叶片直接供食用的特点。因此,给叶类菜地施肥时,一要增加氮肥施用量,提高氮肥施用效果,二要施肥入土,减少肥料对叶面的污染。 一、施尿素后不能马上浇水,尿素入土后,要在土壤微生物的作用下才能转化为可供根系吸收的碳铵状态,这一过程一般需5—7天,因此施尿素后5—7天再浇水才利于吸收。另外,尿素为中性分子,施后马上浇水易流
Leafy vegetables have the characteristics of fast growth, large amount of nitrogen needed and direct feeding of leaves. Therefore, to fertilize the leaves of vegetable fields, it is necessary to increase the amount of nitrogen fertilizer to improve the effect of nitrogen fertilization, and second, to fertilize the soil to reduce fertilizer pollution on the foliage. First, urea can not be applied immediately after watering, urea into the soil, under the action of soil microorganisms can be converted to the root system for the absorption of ammonium bicarbonate state, the process generally takes 5-7 days, so urea 5-7 Re-watering is conducive to absorption. In addition, urea is a neutral molecule, immediately after application of water easily flow