Urea is a neutral fertilizer used to fertilize various soils and plants. Urea, also known as urea or carbamide, is a white crystal of organic compounds composed of carbon, nitrogen, oxygen, and hydrogen. One of the simplest organic compounds is the main nitrogen-containing end product of protein metabolism and decomposition in mammals and certain fish. Urea is easy to preserve, convenient to use, and has little destructive effect on soil. It is a widely used chemical nitrogen fertilizer and also the nitrogen fertilizer with the highest nitrogen content. Ammonia and carbon dioxide are used in industry to synthesize urea under certain conditions.
In the eyes of many farmers, urea is a universal fertilizer. The crops are not growing well, throw away some urea; The leaves of the crops have turned yellow, and some urea has been thrown on them; Even if the crops are not fruiting, if you see that the fruiting effect is not very ideal, quickly add some urea; Even urea is used as foliar fertilizer.
What is the function of urea? If the function and purpose of urea are not clear, it may lead to half the effort and even fail to achieve the desired effect. In serious cases, it can affect the growth of crops, resulting in reduced or even no harvest!
Everyone knows that urea is a nitrogen fertilizer with a relatively high nitrogen content. The most important element required for crop growth is nitrogen fertilizer. So everyone believes that if crop growth is not ideal, it is definitely due to a lack of nitrogen fertilizer. Actually, that's not the case. If you know the role and effectiveness of nitrogen fertilizer, you will be able to make reasonable use of urea.
Urea is a very important chemical fertilizer and one of the most common nitrogen fertilizers used by farmers for crops. The nitrogen content in urea is about 46%, which is the highest among all solid fertilizers. Urea is a neutral fertilizer that is suitable for various soils and any plant. It is easy to preserve, convenient for transportation, and has minimal soil damage. It is also the most commonly used nitrogen fertilizer in agricultural production.
Urea can promote crop growth. The nitrogen element in urea is one of the essential nutrients for crop growth and development. If crops lack nitrogen fertilizer, they will show lighter plant colors and yellowing of old leaves at the base; The stems of crops are thin and weak; Lack of branching or tillering leads to premature aging of crops; If there is a lack of nitrogen fertilizer in fruit trees, it can lead to small, few, thick, and hard fruit peels.
Urea can promote the development of new shoots in crops during the growth period. During the growth stage of crops, applying urea can promote the development of new shoots in crops (especially fruit trees). The use of urea in crops can promote the nitrogen content of crop leaves, accelerate the growth of new shoots, and inhibit flower buds.
Urea, as a foliar fertilizer, can supplement crops with fertilizer while killing pests. After dissolving urea and laundry detergent in clean water, foliar spraying on crops can quickly supplement fertilizers and effectively kill some pests. The killing performance of soft pests such as cabbage worms, aphids, and red spiders reaches over 90%. As a neutral fertilizer, urea is easily absorbed by leaves and causes minimal damage to crops.
Although urea is a good fertilizer, there are also some taboos in its use. If used improperly, it will reduce the fertilizer efficiency of urea, and even cause fertilizer damage to crops, affecting crop growth, and even causing crop yield reduction.
Use before rain. Many farmers believe that urea is easily soluble in water. Using urea on crops before rain can promote good dissolution of urea and help crops absorb it. However, this can actually lead to the loss of urea fertilizer efficiency. Urea dissolved in rainwater will produce ammonia gas, causing the loss of nitrogen elements, and urea may also be washed away by rainwater.
In the later stage of crop growth, urea is used for topdressing. Many farmers use urea for top dressing during the later stages of crop growth, believing that this can quickly supplement the nitrogen fertilizer needed by the crops. But in the later stages of crop growth, try not to use nitrogen fertilizer for top dressing. This will cause excessive growth of crops, such as corn and wheat, which can cause lodging; Cabbage, cabbage, and the like can cause delays in filling.
Mix with alkaline fertilizer for application. Some farmers believe that urea is a simple nitrogen fertilizer, so they want to mix it with other fertilizers to ensure that the nutrition of the crops is more comprehensive. But if urea and alkaline fertilizer are mixed, it will cause urea decomposition, produce a large amount of ammonia, and cause nitrogen loss.