What is the appropriate concentration of urea foliar fertilizer (master the ratio and concentration of urea foliar fertilizer)

1. Why can urea be used as foliar fertilizer?

1. Urea is a quick-acting fertilizer with high nitrogen content and stable chemical properties. It works well as foliar fertilizer or topdressing.

2. Fast absorption. In the early stage of crop growth, especially some green leafy plants, the demand for nitrogen is large. Soil topdressing not only easily damages the root system, but also has a slow absorption and conversion rate.

Ordinary granular fertilizers cannot be directly absorbed after entering the soil. They need to be transformed for a week to be converted into elements that can be absorbed by the root system. This can also be understood as decomposition. For this reason, spraying urea is particularly suitable for crops that need nitrogen deficiency.

2. What should we pay attention to when using urea as foliar fertilizer?

First, concentration dilution

Fruits and vegetables have different fertilizer requirements, so when using urea as foliar fertilizer, you should pay attention to the concentration.

Second, improve the absorption rate

In order to promote better and faster absorption of urea, some foliar fertilizer enhancers can be added to the diluted solution to increase the adhesion of nutrients on the leaves, such as Dehua silicone instant treatment and fission, which can effectively prevent high temperature and rainy weather.

Third point, spraying time

The time to spray foliar fertilizer should pay attention to the characteristics of crops. The main element of urea is nitrogen, which is more needed in the seedling stage or before flowering. Daily spraying can be done before 10 o'clock in the morning and in the evening, usually once every half a month.

Fourth point, spraying site

When spraying urea as foliar fertilizer, the nozzle should be pointed upwards and slanted towards the back of the leaves. This can increase the nutrient absorption rate. The following operation method will result in insufficient nutrient absorption.

3. How to use urea as 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 lower, and the fertilizer liquid can be sprayed on 5 mu of land.

2. Leafy vegetables

For example, the spraying concentration for vegetables and cucumbers is 1-1.5% , that is, 1 kg to 1.5 kg of urea granules are added to 100 kg of water.

3. Fruit trees, apples, pears, grapes, etc.

For fruit trees, 0.5% is appropriate , that is, add 0.5 kg of urea fertilizer to 100 kg of 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.