Generally speaking, for every 500 kilograms of rice produced, 8 to 16 kilograms of pure nitrogen need to be absorbed from the soil, 4 to 7.5 kilograms of phosphorus (phosphorus pentoxide), and 9 to 19 kilograms of potassium (potassium oxide). These The absorption of elements is distributed in every growth period of rice.
The law of nitrogen absorption by rice is: transplanting to booting stage, accounting for about 10% of the total; tillering to booting stage, accounting for about 80% of the total; booting to maturing stage, accounting for about 20% of the total.
The law of phosphorus absorption by rice is: tillering to booting stage, which accounts for about 50% of the total; booting to maturity, accounting for about 50% of the total.
The absorption rules of potassium by rice are: turn green to tillering stage, accounting for about 5% of the total; tillering to young ear differentiation stage, accounting for about 35% of the total; young ear differentiation to the flowering stage, accounting for about 60% of the total %.
After the heading stage, the absorption of nitrogen, phosphorus, and potassium by rice gradually weakens, and most of the nutrients and nutrient elements required for the grain filling stage are stored in the early stage of heading. Therefore, we must master the normal fertilization time and control the amount of fertilizer.
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