| 【Objective】Higher chemical fertilizers were applied in rice-rice-vegetable triple cropping area, which caused serious soil acidification and high risks in the decrease of land quality. The effects of two alkaline materials（lime and acid soil conditioner）on soil fertility and crop yield in rice-rice-vegetable rotation system were studied so as to provide theoretical and technical support for the improvement of soil fertility and crop yield in such cropping area.【Method】A field experiment was carried out in Taishan City of Guangdong Province from 2015 to 2017 with three treatments: hydrated lime（lime）, acid soil conditioner（ASC）and conventional fertilization（CK）. The effects of different treatments on crop nutrient content, yield and soil fertility were compared.【Result】The annual yield of ASC treatment was the highest, followed by lime treatment and CK treatment. The yield of winter kidney bean treated by lime and ASC was higher than that of CK, while the yield of early and late rice was basically the same. The effective tiller number of early and late rice under lime treatment and ASC treatment was higher than that of CK, but the difference was not significant. In winter vegetable season, the P contents of the crops under lime and ASC treatments increased slightly. Soil pH value was increased greatly under lime treatment and ASC treatment. In winter vegetable season, early rice season and late rice season, soil pH values under lime treatment were significantly higher than those of CK treatment. For ASC treatment, the soil pH value only increased significantly in early rice season. Compared with CK, the soil available P and SOC under lime and ASC treatments were increased slightly, especially in winter vegetable season. However, there was no difference in soil bulk density, alkali nitrogen and available K among different treatments. Compared with CK treatment, the activity of soil acid phosphatase was increased significantly under lime treatment and ASC treatment, and the increase during winter vegetable season was significant.【Conclusion】In the rice-rice-vegetable triple cropping system, the application of lime and acid soil conditioner can alleviate the soil acidification effectively, increase the soil available P and acid phosphatase activity, and increase the yields of kidney bean, early rice and late rice. The responses of alkaline materials were greater in winter vegetable season. Under the experimental conditions, the application of lime and acid soil conditioner can be used as effective measures to improve acidified soil in the rice-rice-vegetable triple cropping areas of Guangdong Province, and the lime has a greater impact on soil pH. |
