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In the water-and-dry rotation, the soil undergoes a process of drying from wet to wet and from wet to wet. In the process of becoming wet, the ph of the paddy soil changes under waterlogging conditions, and the water increases, which can increase the content of available phosphorus. When the soil is wetted by the wet and the temperature in winter is low, the available phosphorus content is often reduced, which makes the phosphate fertilizer applied to the dry crop have a greater aftereffect on the later rice, and the phosphate fertilizer applied to the rice. The contribution of post-dry farming is small. Therefore, in the southern water-and-dry rotation area, especially in the case of phosphorus in the soil in the form of iron phosphate, the focus of phosphorus application is on dry farming, while the small amount of phosphate fertilizer is rooted to meet the rice seedling stage. The need to increase the effect of phosphorus can fully exert the effect of increasing production.
Since phosphate fertilizer has a aftereffect, and the effect of phosphorus applied to paddy fields or dry land is different, it is necessary to do a good job of allocation of phosphate fertilizer in water and drought rotation.
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