Recently, some friends who are planting fertilization have been asked about the problems of urea foliar fertilizer. For example, can urea be used as foliar fertilizer? How much is the comparison of urea foliar fertilizer? What is the problem of using urea when foliar fertilizer is used? Let's talk about science for everyone.
Why can urea be used as foliar fertilizer?
1. Urea is a quick-acting fertilizer, and it has high nitrogen content, stable chemical properties, and is good for foliar fertilizer or top dressing.
2, fast absorption, in the early stage of crop growth, especially some green leaf plants, etc., the demand for nitrogen is large, but soil topdressing is not only easy to damage the root system, while the absorption rate is slow, ordinary granular fertilizer can not be directly absorbed after entering the soil It takes a week's transformation to transform into an element that the root system can absorb, or it can be understood as decomposition. It is particularly suitable to spray urea on crops that require nitrogen deficiency. What problems (experience) should be paid attention to when urea is used as foliar fertilizer?
The first point is that the concentration is diluted, and the characteristics of fertilizers for fruits and vegetables are different. Therefore, when taking urea as foliar fertilizer, attention should be paid to the concentration. The dilution concentration can be found in the next paragraph.
The second point is to increase the absorption rate. In order to promote the better and faster absorption of urea, some foliar fertilizer synergists can be added to the diluted solution to improve the adhesion of nutrients on the foliage, such as the instant chemical treatment of Dehua And fission, can effectively prevent high temperature and rainy weather.
The third point, the spraying time, the problem of foliar application time should pay attention to the characteristics of crops. The main element of urea is nitrogen, which needs more in the seedling stage or before flowering.
The daily spraying time can be carried out before 10 o'clock in the morning and in the evening, usually once every half month.
The fourth point, the spraying part, urea when the foliar fertilizer is sprayed, the nozzle should be facing upwards and diagonally facing the back of the leaf, which can increase the nutrient absorption rate. The following operation methods have the problem of insufficient nutrient absorption.
How is urea as a foliar fertilizer (concentration)?
1. Cereal crops are sprayed at a concentration of 1.5-2%, that is, 1.5 kg to 2 kg of urea granules are added to clear water with a water content of 100 kg.
When spraying during flowering, the concentration of urea should be lower, and the fertilizer can be sprayed with 5 mu of land (15-20 kg of water per mu).
2. The spraying concentration of leafy vegetables such as vegetables and cucumber is 1-1.5%. That is, adding 1 kg to 1.5 kg of urea granules with 100 kg of water.
3, fruit trees, apples, pears, grapes and other fruit trees are preferably 0.5%. That is, the amount of water is 100 kg of water and 0.5 kg of urea fertilizer is added, and the solution is fully stirred.
4, Solanum, spraying concentration of 0.3% is best, that is, the amount of water is 100kg of water to add 0.3 kg of six or two urea.
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