1 硫酸铵含氮20—21％,为酸性肥料,多用作追肥。每亩每次用量7.5公斤左右。 2 硝酸铵含氮33—35％,为中性肥料,多用作追肥。每亩每次用量5公斤左右。 3 尿素含氮45—48％,为中性肥料。可以混拌在厩肥、堆肥中作基肥,每亩用2.5—5公斤。也可作追肥,每亩每次用量2.5公斤左右。 4 过磷酸钙含磷16—20％。可作基肥、种肥,也可作追肥。这种肥料最好施用颗粒肥,或混入厩肥、堆肥施用,或根外追 1 ammonium sulfate 20-21% of nitrogen, acidic fertilizer, used for top dressing. Per acre amount of about 7.5 kg. 2 ammonium nitrate 33-35% nitrogen, neutral fertilizer, used for top dressing. Per acre amount of about 5 kg. 3 urea nitrogen 45-48%, as a neutral fertilizer. Mixing can be mixed in the manure, composting as a base fertilizer, with 2.5-5 kg ​​per mu. Can also be used for topdressing, consumption of about 2.5 kg per acre. 4 superphosphate phosphorus 16-20%. For base fertilizer, kind of fertilizer, but also for top dressing. This fertilizer is best to apply granular fertilizer, or mixed with manure, compost, or root chase