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Four considerations for the use of fertilizers
1, bogey on the surface of the application of
Urea is applied to the surface, and it can be absorbed by the crop 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 will be more. Therefore, nitrogen cannot be applied on the surface.
2, bogey and mix ammonium bicarbonate
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. After the ammonium bicarbonate is applied to the soil, it has an alkaline reaction with a pH of 8.2 to 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.
3, avoid the application of
The ideal application method is to first apply organic fertilizer (such as human and animal waste, straw, animal residue, slaughterhouse waste, compost, manure, manure, etc.), and then mix urea, superphosphate, potassium chloride and other fertilizers. use.
4, bogey 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. In the process of transformation, due to different soil, water and temperature conditions, the time is long and short, generally it takes 2 to 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 immediately.
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