In general, every 500 kg of rice produced will need to absorb 8 to 16 kg of pure nitrogen from the soil, 4 to 7.5 kg of phosphorus (phosphorus pentoxide), and 9 to 19 kg of potassium (potassium oxide). Absorption of elements is distributed in every growing period of rice.
The absorption of nitrogen by rice is from transplanting to booting, which accounts for about 10% of the total; from tilling to booting, it accounts for about 80% of the total; from booting to maturity, it accounts for about 20% of the total.
Phosphorus uptake by rice is from tillering to booting, which accounts for about 50% of the total; from booting to maturity, it accounts for about 50% of the total.
The absorption pattern of potassium in rice is: returning green to the tillering stage, accounting for about 5% of the total; from tillering to young panicle differentiation, accounting for about 35% of the total; young panicle differentiation to flowering, accounting for about 60 of the total %.
After heading date, the absorption of nitrogen, phosphorus, and potassium in rice gradually weakened, and the storage of nutrients and nutrients required during the grain filling stage was mostly completed in the early stage of heading. Therefore, we must master the normal fertilization time and control the amount of fertilizer.
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