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一、钙镁磷肥忌作追肥 钙镁磷肥作追肥利用率低,效果差,只有作基肥与有机肥料混施,或作种肥,其肥效才好。 二、施用浓度忌过高 尿素含氮量较高,施入土壤后大部分需经微生物分解,转化为铵态氮才能被作物吸收利用。碳铵的性质不稳定,地表浅施利用率低,同时氮肥浅施若追肥量大,浓度过高,会熏伤作物根茎,造成肥害。
First, magnesium and magnesium phosphate avoid bogey Top-down for calcium and magnesium phosphate fertilizer for low fertilizer utilization, the effect is poor, only for basal and organic fertilizer mixed facilities, or as seed fertilizer, its fertilizer effect is good. Second, the application of high concentrations of urea avoid high nitrogen content is high, most of the soil after microbial decomposition, into ammonium nitrogen can be absorbed by crops. The nature of ammonium bicarbonate instability, the shallow surface utilization rate is low, while the amount of nitrogen if shallow fertilizer, the concentration is too high, it will smudge the crop rhizome, resulting in fertilizer damage.