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Excessive nitrogen fertilizer is not only beneficial to the growth of tomatoes, but also brings a lot of harm. First of all, the excessive nitrogen fertilizer makes the branches and leaves of the tomatoes relatively tender, densely growing, poor ventilation and light transmission, and easily lead to disease occurrence. Secondly, too much nitrogen fertilizer, especially ammonia nitrogen, is likely to cause crops to be hindered by the absorption of potassium, boron, magnesium and other elements, so that vegetables lack these elements.
There are many reasons for excessive nitrogen fertilizer, the most important is the use of nitrogen-containing fertilizers. In addition, the large amount of chicken manure is also a reason that cannot be ignored. Because chicken manure is a relatively quick-acting organic fertilizer, the nitrogen is easily absorbed by crops. In addition to the above reasons, the most common symptoms of excessive nitrogen fertilizer are in the greenhouse where the nematicide is fumigated through the soil. Because most of the microorganisms have been killed after the soil is disinfected, the ammonia nitrogen fertilizer applied to the soil cannot be converted in time, resulting in excess ammonia nitrogen fertilizer.
The most important way to solve the problem of excessive nitrogen fertilizer is to apply less fertilizer. Even chicken manure, which is used as a base fertilizer, cannot be applied more, generally 5 to 7 square meters per mu. During the growing season, some microorganisms or humic acid fertilizers can be applied. In the summer leisure season, you can use large water to soak the fields. It can wash away excess nitrogen and other salt, and eliminate root-knot nematodes in the soil. This is a good way to do it.
Rational nitrogen application of tomatoes is critical
In many greenhouses where tomatoes are grown, they often see such symptoms. The stems are very thick, but the tips are very thin. Sometimes the stems are flattened by circles, and even longitudinal grooves appear in the center of the stems. Boron symptoms). The leaves are dense, the leaves are dark green, and the upper leaves are not normally stretched, but are bent downward like a shofar. The middle part of the lower small leaves protrudes like a ship bottom. The fruit grows slowly, and some fruits also have symptoms such as green shoulders and painted faces. All of these symptoms are caused by excessive nitrogen use, resulting in excess nitrogen.
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