Since phosphate fertilizers are all aftereffects, and the post-effects of phosphorus applied to paddy fields or dry lands are different, the distribution of phosphate fertilizers in paddy-upland rotations must be well established.
In the paddy-upland rotation, the soil is undergoing a process of dry wetting and drying from wet. In paddy soils, due to the change of pH during the process of getting wet, the pH changes under the conditions of waterlogging and the increase of water content can increase the content of available phosphorus. However, when the soil is wet and dry and the temperature in winter is low, the available phosphorus content is often reduced. This makes the phosphate fertilizer applied to dry farming have greater after-effects on post-crop rice, and the phosphate fertilizer applied to rice After the drought, the contribution of drought is relatively small. Therefore, under the conditions of flooded areas in southern China, especially phosphorus in the soil, ammonium phosphate is the dominant form of phosphorus. Phosphorus is mainly applied to dry farming, and a small amount of phosphate fertilizer is used to meet the rice seedling stage. This will increase the effect of phosphorus and give full play to the increase in production.
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