What is the appropriate concentration for foliar application of urea
Let's share the content about the appropriate concentration for foliar application of urea in green plants and flowers. Follow the editor to see the specific details!
What is the appropriate concentration for foliar application of urea
Dilute the concentration, as different crops have different fertilizer requirements. When using urea as a foliar fertilizer, attention should be paid to the concentration. The spraying concentration for cereal crops is 1.5-2%, which means adding 1.5 to 2 kilograms of urea granules to 100 kilograms of clean water. During the flowering period, the concentration of urea should be even lower, and the fertilizer solution can be sprayed on 5 mu of land.
I. Why can urea be used as a foliar fertilizer
1. Urea is a fast-acting fertilizer with high nitrogen content and stable chemical properties, and it works well as a foliar fertilizer or top dressing.
2. It is absorbed quickly. In the early growth stage of crops, especially green leafy plants, there is a high demand for nitrogen. Soil top dressing can easily damage the roots and has a slow absorption and transformation rate.
Regular granular fertilizers cannot be directly absorbed after entering the soil and require a week to transform into elements that roots can absorb, which can be understood as decomposition. Therefore, it is particularly suitable to spray urea on nitrogen-deficient crops.
II. What issues should be considered when using urea as a foliar fertilizer
First, dilute the concentration.
Different crops have different fertilizer requirements, so attention should be paid to the concentration when using urea as a foliar fertilizer.
Second, improve absorption rate.
To promote better and faster absorption of urea, some foliar fertilizer enhancers can be added to the diluted solution to increase the adherence of nutrients on the leaves, such as Dehua organic silicon Xunzhi and Liefen, which can effectively prevent high temperature and heavy rain conditions.
Third, spraying time.
The issue of foliar fertilizer spraying time needs to consider the crop's specific needs. Urea's main element is nitrogen, which is needed more during the seedling stage or before flowering. The usual spraying time is before 10 a.m. and in the evening, generally once every half a month.
Fourth, spraying location.
When using urea as a foliar fertilizer, the spray head should be pointing upwards and斜对着 the back of the leaves to improve nutrient absorption. The following operation method has insufficient nutrient absorption.
III. How to mix urea for foliar application
1. Cereal crops
The spraying concentration is 1.5-2%, which means adding 1.5 to 2 kilograms of urea granules to 100 kilograms of clean water. During the flowering period, the concentration of urea should be even lower, and the fertilizer solution can be sprayed on 5 mu of land.
2. Leafy vegetables
The spraying concentration for vegetables and cucumbers is 1-1.5%. That is, adding 1 to 1.5 kilograms of urea granules to 100 kilograms of clean water.
3. Fruit trees, such as apples, pears, grapes, etc.
Fruit trees should use a concentration of 0.5%. That is, adding 0.5 kilograms of urea fertilizer to 100 kilograms of clean water and stirring thoroughly.
4. Solanaceous vegetables
The best spraying concentration is 0.3%. That is, adding 0.3 kilograms (six liang) of urea to 100 kg of clean water.
The above shared content about the appropriate concentration for foliar application of urea is hoped to be helpful to you!