Late rice application of urea four bogey
2022-09-07 12:03:36
Urea contains 46% nitrogen, which is the ideal fertilizer for late rice, but it should be noted that the correct application of urea in late rice has "four bogey":
First, avoid single application. The ideal application method is to apply the organic fertilizer first, and then apply the urea, the superphosphate and the potassium chloride in a reasonable formula.
Second, avoid mixing with ammonium carbonate. After urea is applied to the soil, it is converted into ammonia to be absorbed by the crop, and its conversion rate is much slower under alkaline conditions than under acidic conditions. The ammonium carbonate is alkaline after being applied to the soil, and the pH is 8.2-8.4. When mixed with ammonium bicarbonate and urea, the rate of conversion of urea into ammonia is greatly slowed down, which is likely to cause loss of fastactivin and loss of volatilization. Therefore, urea and ammonium bicarbonate are not suitable for mixing or simultaneous application.
Third, avoid bogey on the surface. Urea is applied to the surface, and it can be absorbed by crops after 4-5 days of transformation at room temperature. Most of the nitrogen is volatilized during the ammoniumification process, and the utilization rate is only about 30%, if it is high in alkaline soil and organic matter. The soil is applied and the loss of nitrogen is much faster. Therefore, nitrogen cannot be applied to the surface.
Fourth, avoid applying urea immediately after applying urea. Urea is an amine nitrogen fertilizer, which must be converted into ammonia nitrogen after application to be absorbed and utilized by crops. The conversion process is different due to different conditions such as soil quality, moisture and temperature. The time is long and short. It usually takes 2-10 days to complete. If the urea is applied immediately after application or the dry land is applied before heavy rain, the urea will be lost deeper than water.
First, avoid single application. The ideal application method is to apply the organic fertilizer first, and then apply the urea, the superphosphate and the potassium chloride in a reasonable formula.
Second, avoid mixing with ammonium carbonate. After urea is applied to the soil, it is converted into ammonia to be absorbed by the crop, and its conversion rate is much slower under alkaline conditions than under acidic conditions. The ammonium carbonate is alkaline after being applied to the soil, and the pH is 8.2-8.4. When mixed with ammonium bicarbonate and urea, the rate of conversion of urea into ammonia is greatly slowed down, which is likely to cause loss of fastactivin and loss of volatilization. Therefore, urea and ammonium bicarbonate are not suitable for mixing or simultaneous application.
Third, avoid bogey on the surface. Urea is applied to the surface, and it can be absorbed by crops after 4-5 days of transformation at room temperature. Most of the nitrogen is volatilized during the ammoniumification process, and the utilization rate is only about 30%, if it is high in alkaline soil and organic matter. The soil is applied and the loss of nitrogen is much faster. Therefore, nitrogen cannot be applied to the surface.
Fourth, avoid applying urea immediately after applying urea. Urea is an amine nitrogen fertilizer, which must be converted into ammonia nitrogen after application to be absorbed and utilized by crops. The conversion process is different due to different conditions such as soil quality, moisture and temperature. The time is long and short. It usually takes 2-10 days to complete. If the urea is applied immediately after application or the dry land is applied before heavy rain, the urea will be lost deeper than water.
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