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近些年,根外追肥在国外发展很快,联邦德国、澳大利亚等国家制作了专门应用于根外追肥的叶面液态肥,含氮、磷、钾和微量元素镁、硼、铁、铜、钼和锌,对缺乏微量元素的作物,制作了复合微量元素肥。他们的实验表明:在蔬菜,果树生产上,应用根外追肥,可以显著提高产量,还可以提早成熟、延迟衰老,延长供应期。
In recent years, top-dressing has developed rapidly in foreign countries. Foliar liquid fertilizers such as foliar fertilizer, nitrogen, phosphorus, potassium and trace elements such as magnesium, boron, iron, copper, Molybdenum and zinc, the lack of trace elements of crops, produced a composite trace fertilizer. Their experiments show that in the production of vegetables and fruit trees, applying root top dressing can significantly increase the yield, and can also prematurely mature, delay the aging and prolong the supply period.