What is the most suitable concentration for spraying urea foliar fertilizer?

Urea is a common nitrogen fertilizer. It is a quick-acting fertilizer with a high nitrogen content and stable chemical properties. It works well as foliar fertilizer or topdressing. So what is the most appropriate concentration for spraying urea foliar fertilizer? Let’s learn more about it below.

What is the most suitable concentration for spraying urea foliar fertilizer?

1. Cereals

The spraying concentration is 1.5-2%, that is, add 1.5 kg to 2 kg of urea granules to 100 kg of clean water. When spraying during the flowering period, the concentration of urea should be even lower, and the fertilizer solution can be sprayed on 5 mu of land (15-20 kg of water per mu).

2. Vegetables

For example, the spraying concentration for leafy vegetables and cucumbers is 1-1.5%. That is, add 1 kg to 1.5 kg of urea granules to 100 kg of clean water.

3. Fruit trees

For fruit trees such as apples, pears, and grapes, 0.5% is appropriate. That is, add 0.5 kg of urea fertilizer to 100 kg of clean water and stir thoroughly to dissolve.

4. Solanaceae

The best spraying concentration is 0.3%, that is, add 0.3 kg or 6 taels of urea to 100 kg of water.

How to use urea foliar fertilizer correctly?

1. Spraying time

The main element of urea is nitrogen, which is in greater demand during the crop seedling stage or before flowering. Daily spraying time can be done before 10 am and in the evening. Be careful to avoid using it on hot days at noon. Spraying foliar fertilizer on hot days at noon is very likely to burn the seedlings. Generally, it is sufficient to spray once every half a month.

2. Spraying location

When spraying urea as foliar fertilizer, the nozzle should be pointed upwards and diagonally towards the back of the leaves. This can increase the nutrient absorption rate.

3. Compound use

In the middle and late stages of crop growth, crops need not only nitrogen, but also phosphorus, potassium and a variety of trace elements. Therefore, in order to improve the effect of use, it is best to use them in combination. For example, urea aqueous solution can be used in combination with potassium dihydrogen phosphate, insecticides , fungicides , plant growth regulators , etc.

4. Amount of spraying

Due to its relatively high nitrogen content, urea is more likely to burn seedlings and roots. When using urea as foliar fertilizer, pay attention to controlling the dosage. The safer range is 0.2%-0.5%.

In general, urea has a very high nitrogen content and a rapid fertilizer effect, making it a very good choice for foliar fertilizer. However, improper use of urea foliar fertilizer can easily cause seedling burn, so extra attention should be paid to controlling the concentration used, the amount of spraying, etc.