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根外追肥是把液体肥料喷在叶面上,通过叶面气孔吸收肥料的一种追肥方法。根据我们公社多年试验体会,根外追肥肥效快,用肥经济,能增多水稻植株体内氮、磷、钾的含量,提高光合作用,增加千粒重,降低不实率,增产显著。特别是喷施磷酸二氢钾、过磷酸钙加小灰、过磷酸钙加小灰加尿素等肥料溶液,能促进早抽穗,提早成熟3—5天。为了战低温夺高产,七六年全社在贪青晚熟的水稻田大面积搞了根外追肥,面积达三万亩(其中过磷酸钙加小灰喷二万七千亩,磷酸二氢钾二千亩,过磷酸钙加小
Root top dressing is the liquid fertilizer sprayed on the foliage, through the foliar pores to absorb fertilizer a top dressing method. According to our commune years of experiment experience, root top dressing fertilizer fast, fertilizer economy, can increase nitrogen, phosphorus and potassium content in rice plants, improve photosynthesis, increase 1000-grain weight, reduce false rate, increase yield significantly. Especially spraying potassium dihydrogen phosphate, calcium superphosphate plus small ash, calcium superphosphate plus small ash plus urea and other fertilizer solutions, can promote early heading, early maturity 3-5 days. In order to win low-temperature war on high-yielding, the whole community in late July and nowadays has made a large area of top-dressing crops with a topsoil area of 30,000 mu (of which, 20,000 tons of superphosphate and small ash are sprayed, and potassium dihydrogen phosphate 2 Mu, superphosphate plus small