How can the fertilizer efficiency of urea be improved? These methods are very practical
What methods can improve the fertilizer efficiency of urea? Please introduce the methods. The fertilizer efficiency of urea can be improved using the following methods: 1. Deep application of urea: this not only helps the conversion of urea, but also reduces volatilization loss after urea is converted into ammonium carbonate. When applying, it must not be too close to the root system, to prevent ammonia damage and seedling burn. 2. ...
What methods can improve the fertilizer efficiency of urea? Please introduce the methodsThe fertilizer efficiency of urea can be improved using the following methods:
1. Deep application of urea:This not only helps the conversion of urea, but also reduces volatilization loss after urea is converted into ammonium carbonate. When applying, it must not be too close to the root system, to prevent ammonia damage and seedling burn.
2. Application method of urea in paddy fields:When urea is used as a topdressing for rice, considering the characteristic of high mobility in the early stage, do not irrigate immediately after application; wait a few days until it is converted into ammoniacal nitrogen before irrigating.
3. Apply less but more often:On sandy soil, never apply an excessive amount of urea at one time and cause loss. It is best to follow the principle of "eat less but more often" and apply it flexibly.
4. Apply in advance:Because urea is a low-molecular organic compound, after being applied to the soil it must undergo an ammonification process and be converted into ammonium carbonate, which is highly volatile, before it can be absorbed by the crop root system. Therefore, when using urea as a topdressing, it should be applied about 7 days earlier than other nitrogen fertilizers.
5. Do not mix with alkaline fertilizers:Because urea is a neutral fertilizer, if it is mixed with alkaline fertilizers, it is likely to reduce fertilizer efficiency. If they are applied alternately, they should also be spaced 3-5 days apart.
6. Do not water or irrigate immediately after applying urea:After urea is applied to the soil, it cannot be adsorbed by the soil before it is decomposed and converted. If irrigation is done immediately after topdressing, it will cause a large loss of urea. When the soil is severely short of water and irrigation is unavoidable, small amounts of frequent watering should also be used; never use flood irrigation.
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