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追肥的目的在于调解土壤供肥状况和作物需肥间的矛盾。为了充分发挥肥效,应做到“五看和五定”。1.看土壤性质,定追肥的种类。一般来讲,酸性土壤不宜追施氯化铵、硫酸铵等酸性肥料,以免加剧土壤酸化;碱性土壤不宜追施氨水、碳酸氢铵,尿素等,如若追施,应采取“深施严覆土”措施,以防氮素挥发;砂土地吸肥保肥力差,不宜追硝酸铵、碳酸氢铵和氨水;水田不宜追硝酸铵,忌氯作物不论在什么土壤上,都不应施氯化铵和氯化钾。
The purpose of top dressing is to mediate the contradiction between the status of fertilizer for the soil and the demand of the crop. In order to give full play to fertilizer efficiency, should be “five see and five fixed.” 1. Look at the nature of the soil, the type of top dressing. In general, acid soil should not be topdressing ammonium chloride, ammonium sulfate and other acidic fertilizers, so as not to aggravate the soil acidification; alkaline soil should not be pursued ammonia, ammonium bicarbonate, urea, etc., topdressing, should take “ ”Measures to prevent the volatilization of nitrogen; sand fertilizer to absorb fertility is poor, should not be chasing ammonium nitrate, ammonium bicarbonate and ammonia; paddy should not be chasing ammonium nitrate, bogey chlorine crops no matter what the soil, should not be applied to ammonium chloride And potassium chloride.