Urea can not be fed immediately after crop application of urea. The reason is that urea is an amine nitrogen fertilizer and must be converted into ammonia nitrogen before it can be absorbed and utilized by crops. Due to different conditions such as soil quality, moisture and temperature, the conversion process can take two to ten days to complete. If urea is applied immediately after irrigation or if dry land is applied before heavy rain, urea will dissolve in water and be lost. The correct method of using urea is by furrowing or acupuncture: applying furrows or open holes, the furrows (holes) are 7-10 cm deep, and the soil is covered immediately after application, so that the urea is tightly bound to the soil and is not exposed on the surface. Completely change the practice of surface dissemination and increase the utilization rate. Some farmers in the production also applied urea when they applied urea, but the ditch was shallow, the covering was not detailed, and some even simply applied to expose the urea to the surface. The physical properties of urea were considered to be relatively stable and volatile, but I do not know how Under the action of soil microorganisms, it also volatilizes and disperses like ammonium carbonate. It's only a little later.
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