What is the law of fertilizer requirement in each growth stage of rice?

Nitrogen absorption law: sleep to nitrogen nutrition is very sensitive, is the most important factor to determine the quality of rice, rice life in the body has a higher nitrogen concentration, which is required for high-yield rice nutritional physiological characteristics. There are two obvious peaks of nitrogen uptake by rice: one is at tillering stage, that is, 2 weeks after transplanting, and the other is 7~8 weeks after transplanting. If nitrogen supply is insufficient at this time, it often causes spikelet degeneration, which is not conducive to high yield. Phosphorus uptake law: rice phosphorus uptake is much lower than nitrogen, about half of the average nitrogen, but still need to absorb more phosphorus in the late growth stage. Rice needs phosphorus at all growth stages, and its absorption law is similar to that of nitrogen nutrition. The absorption peak was around 3 weeks after transplanting. At this time, the accumulation amount of total phosphorus in rice accounted for about 54% of the total phosphorus in the whole growth period, and the phosphorus pentoxide content per gram of dry matter was the highest at the peak tillering stage, about 2.4 mg. At this time, phosphorus nutrition was insufficient, which affected the accumulation of dry matter above and underground parts of rice tillering number. The phosphorus absorbed by rice at seedling stage can be transferred from senescent organs to new organs repeatedly during re-growth and over-growth. About 60%~80% of phosphorus is transferred to grains at yellow ripening, while most of phosphorus absorbed after heading remains in roots. K absorption law: K absorption is higher than N, indicating that rice needs more K, but its K absorption has been basically completed before rice heading and flowering. The potassium uptake of seedlings was not high, and the potassium content in plants between 0.5% and 1.5% did not affect normal tillering. The peak of potassium uptake was from tillering stage to jointing stage, and the potassium content in stem and leaf was above 2%. When the potassium content in stem and leaf was less than 1.2%, the number of spikelets decreased significantly. From heading stage to harvest stage, potassium in stems and leaves did not concentrate to grains like nitrogen and phosphorus, and its content was maintained between 1.2% and 2%.