Because urea is a non-polar organic neutral fertilizer. The molecule is small, has a high solubility in water, and is easily absorbed by the foliage of the crop without burning the leaves. Therefore, it is suitable for top dressing of crop roots.
Urea as a top dressing can be carried out at all stages of crop growth. However, it is generally better to start using the plant after the coverage of the ground reaches 70%. Production is generally applied mainly in the middle and late growth stages in which the ability of crop roots to absorb nutrients begins to decline, and when crop root absorption is hindered (such as salt damage, wet damage or root disease).
Urea as a root top dressing is to formulate urea into a solution with a concentration of 0.5-2.0% (ie, add half a catty to 2 kg of urea in 100 kg of water), spray with a sprayer, and spray the solution per acre 60-100 kg. Rice, wheat, corn and other field crops can be used in a concentration of about 1.5 to 2% urea solution; fruit trees, vegetables and other crops should be lower, generally 0.5 to 1.0%. The spraying time should be chosen on a sunny day. It is best not to rain for 2 to 3 days after spraying. If necessary, spray two or three times, each time between 7 and 10 days.
When the root is topdressed, the urea is directly in contact with the stems and leaves of the crop, so the urea used to contain biuret impurities should not be too high to prevent poisoning. Different crops have different requirements for biuret content. Wheat, fruit trees, vegetables, etc. require that the biuret content in urea does not exceed 0.5%; corn, rice and other crops require biuret content not higher than 1%.
The urea top dressing can be combined with chemical weeding, chemical treatment of insects, etc., and can also be mixed with other fertilizers such as phosphorus, potassium and trace elements to form a mixed fertilizer solution.
Urea as a top dressing can be carried out at all stages of crop growth. However, it is generally better to start using the plant after the coverage of the ground reaches 70%. Production is generally applied mainly in the middle and late growth stages in which the ability of crop roots to absorb nutrients begins to decline, and when crop root absorption is hindered (such as salt damage, wet damage or root disease).
Urea as a root top dressing is to formulate urea into a solution with a concentration of 0.5-2.0% (ie, add half a catty to 2 kg of urea in 100 kg of water), spray with a sprayer, and spray the solution per acre 60-100 kg. Rice, wheat, corn and other field crops can be used in a concentration of about 1.5 to 2% urea solution; fruit trees, vegetables and other crops should be lower, generally 0.5 to 1.0%. The spraying time should be chosen on a sunny day. It is best not to rain for 2 to 3 days after spraying. If necessary, spray two or three times, each time between 7 and 10 days.
When the root is topdressed, the urea is directly in contact with the stems and leaves of the crop, so the urea used to contain biuret impurities should not be too high to prevent poisoning. Different crops have different requirements for biuret content. Wheat, fruit trees, vegetables, etc. require that the biuret content in urea does not exceed 0.5%; corn, rice and other crops require biuret content not higher than 1%.
The urea top dressing can be combined with chemical weeding, chemical treatment of insects, etc., and can also be mixed with other fertilizers such as phosphorus, potassium and trace elements to form a mixed fertilizer solution.
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