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一、尿素和碳铵是常用的氮肥,它们作追肥应开沟条施或穴施,深度5~10厘米,施后盖土。二、钙镁磷肥在水中不易溶解,肥效缓慢,作基肥与有机肥混施效果好;作追肥时利用率较低,效果差。三、过磷酸钙腐蚀性很强,作追肥应开沟深施;作种肥应施在种子的下方或旁侧5～6厘米处,并用土将肥料与种子隔开。过磷酸钙不宜直接拌种。
First, urea and ammonium bicarbonate is a commonly used nitrogen fertilizer, they should be used for top dressing ditch facilities or facilities, the depth of 5 to 10 cm, after applying cover the soil. Second, calcium magnesium phosphate is not easy to dissolve in water, fertilizer is slow, for the basic fertilizer and organic fertilizer mixed effect is good; for the lower utilization rate when dressing, the effect is poor. Third, the superphosphate is very corrosive, for dressing should be dug deep facilities; for seed fertilizer should be applied to the bottom of the seed or 5 to 6 cm at the side, and the soil with fertilizer and seed separated. SSP should not be directly dressing.