The absorption of phosphorus by rice is far lower than that of nitrogen fertilizer, and the average is about half of nitrogen, but it still needs more absorption in the later period of fertility. Phosphorus is required for all growth stages of rice, and its absorption pattern is similar to that of nitrogen nutrition. The absorption maximum was at the seedling stage and tillering stage, and the absorption peak was at about 3 weeks after transplanting. At this time, the deficiency of phosphorus nutrition affected the number of tillers in rice and the accumulation of dry matter in the ground and underground parts. Phosphorus inhaled during the seedling stage of rice can be repeatedly transferred from the senescent organ to the newly emerged organ in the fertility process, and most of the phosphorus absorbed after the ear emergence remains in the root.
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