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After using urea as top dressing, it is not suitable to apply water immediately after top dressing.
Urea is a white granular crystal that dissolves completely in water and is a neutral fertilizer. No residues remain in the soil after urea application and are referred to as non-auxiliary fertilizers. Urea is also known as carbamide, which has an outstanding feature that the amide nitrogen contained in it cannot be absorbed directly by the crop and must be converted into ammonium nitrogen before it can be used through the action of microorganisms in the soil. If urea is used immediately after irrigation, it will be dissolved by water. Due to the weak adsorption force between soil colloid and urea, urea has great mobility in the soil, especially flood irrigation, which will cause urea to leach deeper. Reduce fertilizer efficiency. Therefore, it is not advisable to apply water immediately after topdressing urea. It is also unscientific to apply topdressing fertilizer before rain. Urea at the temperature of 10 °C, the conversion time takes 7-10 days, 20 °C to 4-5 days, 30 °C 2 days can be fully converted into the crop of ammonia. Based on this, the irrigation time after top dressing can be determined according to the temperature conditions. Urea is best to take deep and cover the soil, so as to avoid exposure to direct volatilization, but also increase the chance of contact with microorganisms in the soil, is conducive to soil colloid adsorption to promote its transformation.