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在碳酸盐褐色土上的6年试验表明,总施肥量相同情况下,6年一次大剂量和每年小剂量两种施磷方式的作物增产效果相似而以后者略高,但后者在提高土壤有效磷方面明显优于前者。在碳酸盐褐色土上一次施磷的残效至少可持续5年以上,虽然大剂量施磷第1年的利用率仅为7％,但6年累加利用率可达34％。土壤中残留肥料磷进入速效库的比例以每年小剂量处理较高,施肥第6年该比例为17％;一次大剂量施肥后6年只有2％的残留肥料磷进入速效库。
The 6-year experiment on carbonate brown soil showed that the yield increase was similar for both the 6-year high and 6-year low-dose phosphorous treatments, but the latter was slightly higher for the same total amount of fertilizer, Soil available phosphorus was significantly better than the former. The residual phosphorus once applied on carbonate brown soil can last for at least 5 years. Although the utilization rate of high-dose phosphorous in the first year is only 7%, the cumulative utilization rate in 6 years can reach 34%. The proportion of residual phosphorus in the soil into the quick-acting depot was higher in the low-dose treatment per year and 17% in the sixth year of fertilization. Only 2% of the residual fertilizer phosphorus entered the quick-acting depot in the six years after the high-dose fertilization.