Urea is an organic compound composed of carbon, nitrogen, oxygen, and hydrogen and has a white crystal or powder appearance. It is a product of animal protein metabolism and is commonly used as a plant nitrogenous fertilizer. In addition to chasing urea, there are many other uses.
First, adjust the amount of flowers. In order to overcome the size of the apple tree, in the case of young age, 5 to 6 weeks after flowering (the critical period of apple flower bud differentiation, when the shoot growth is slow or stopped, the leaf nitrogen content shows a downward trend). The aqueous solution of urea can be sprayed twice, which can increase the nitrogen content of leaves, accelerate the growth of new shoots, inhibit the differentiation of flower buds, and make the flower quantity suitable for the new year.
Second, thinning and thinning fruit. The flower of peach tree is sensitive to urea, but the reaction is relatively insensitive. Therefore, foreign countries used urea to test peach and nectarine. The results showed that peaches and nectarines need large concentrations (7.4%) to show good results, and the most suitable concentration is 8 to 12%. Within 1 to 2 weeks after spraying, sparsely flowering can be achieved. The purpose of the fruit. However, under different land conditions, the reaction of different periods and different species still needs further tests.
Third, rice seed production. In the hybrid rice seed production technique, in order to increase the outcrossing rate of the parents, and to increase the seed production of the hybrid rice or the bred amount of the male sterile line, the female parent is usually sprayed with the toxin to reduce the level of the mother's neck or to make Completely draw out, or spray the parent's book, adjust the growth of the two to synchronize their flowering. As gibberellic acid is more expensive, its cost for seed production is high. People experimented with urea instead of gibberellin, and used 1.5 to 2% urea during the progesterone panicle and heading stage (20% heading), the effect of which was similar to that of gibberellin and did not increase the plant height.
Fourth, pest control. Mixing with a proper amount of urea, detergent, and water in a ratio of 4:1:400 can prevent pests such as fruit trees, vegetable aphids, spider mites, cabbage caterpillars, etc., and the insecticidal effect can reach over 90%.
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