How Many Days Until Urea Takes Effect After Application? A Detailed Explanation of How Long Its Fertilizer Effect Lasts

When urea is applied as a foliar spray, it generally takes effect within 7-15 days. Note that spraying urea before rain is forbidden, to avoid burning the seedlings or losing fertilizer nutrients; early morning or early afternoon is preferable. For cereal crops, the spraying concentration is generally required to be 1.5%-2%; if sprayed during the flowering period, the concentration needs to be appropriately reduced. For fruit trees such as apples and pears, a concentration of 0.5% is suitable.

Precautions for foliar spraying of urea:

1. Do not spray in extremely hot weather or before rain, to avoid burning the seedlings or losing fertilizer nutrients. The best time to spray is early morning or early afternoon each day, and spray again 7-10 days after the first application.

2. When spraying cereal crops or crops with smooth leaves, it is best to add 0.1% of an adhesive (such as laundry detergent or dish soap). Otherwise, the effect will be poor.

3. The urea used for spraying must not contain more than 0.5% biuret; if the content is too high, it will damage the leaves.

4. Master the concentration of urea. For cereal crops, the spraying concentration is generally required to be 1.5%-2%, and when spraying during the flowering period, the concentration should be even lower. For leafy vegetables and cucumbers, the spraying concentration is 1%-1.5%, and for tomatoes 0.3% is suitable. For fruit trees such as apples, pears and grapes, 0.5% is suitable.

Summary: The above content is an introduction compiled for you on how long it takes for foliar spraying of urea to take effect. We hope it can help those who need it.