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误区一:钙、镁、磷肥做追肥。钙、镁、磷肥在水中不易溶解,肥效缓慢,不宜做追肥。特别是在农作物生长中期以后做追肥,其利用率较低,效果差。正确施用方法:钙、镁、磷肥只能做基肥与有机肥混施,或做拌种肥。误区二:尿素、碳酸氢铵等氮素肥浅施、撒施或施用浓度过高。尿素是酰胺态氮肥,含氮较高,施入土壤后除少量被植物直接吸收利用外,大部分须经微生物分解转化成铵态氮才能被作物吸收利用。碳酸氢铵的性质不稳
Misunderstanding one: calcium, magnesium, phosphate fertilizer to make fertilizer. Calcium, magnesium, phosphate fertilizer is not easy to dissolve in water, fertilizer is slow, should not be top-dressing. Especially in the middle crop after the top-dressing, its utilization is low, the effect is poor. The correct method of application: calcium, magnesium, phosphate fertilizer can only do basal fertilizer and organic fertilizer mixed facilities, or make dressing fertilizer. Misunderstanding two: urea, ammonium bicarbonate and other nitrogen fertilizer shallow Shi, spreading or application of high concentrations. Urea is an amide nitrogen fertilizer with a high nitrogen content. After being applied to the soil, most of it is converted into ammonium nitrogen by microorganisms to be absorbed and utilized by crops except for a small amount of it being directly absorbed and utilized by plants. The nature of ammonium bicarbonate is not stable