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在雨季和旱季期间,随着淹水变性土中磷无效,土壤水溶液磷发生变化,稻田淹水和增施磷肥对土壤溶液磷素的波动影响不大。土壤水溶性磷的浓度在雨季比旱季大约高2.5倍,并且与施肥和淹水的时间无关。这种水溶性磷的增加是由于雨季头2个月的温度比旱季相应时期高10℃。这些结果肯定,在旱季较寒冷的二个月,由于磷的释放受到限制,因而,须施较多数量的磷肥。
During the rainy season and the dry season, with the change of phosphorus in the soil water solution, the phosphorus in the soil changed with the change of phosphorus in the flooded soil. The effect of flooding rice and increasing phosphorus fertilizer on the fluctuation of phosphorus in the soil solution was insignificant. Soil water-soluble phosphorus concentrations were about 2.5 times higher in the rainy season than in the dry season and were not related to fertilization and flooding time. This increase in water-soluble phosphorus is due to the fact that the temperature in the first two months of the rainy season is 10 ° C higher than the corresponding period in the dry season. These results confirm that in the two months when the dry season is cold, the release of phosphorus is limited, so a greater amount of phosphate fertilizer is required.