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5年的试验表明,磷肥在石灰性土壤上有明显后效,其后效的大小及持续时间主要取决于磷肥的用量。在试验地区,以每亩施相当于2.7—5.4公斤P_2O_5的磷肥最为经济有效。
Five years of experiments show that the phosphate fertilizer in calcareous soil has significant afterglow, after the effect size and duration depends mainly on the amount of phosphate fertilizer. In the experimental area, it is the most economical and effective to use phosphate fertilizer equivalent to 2.7-5.4 kg of P 2 O 5 per mu.