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 recent years, some experiments at home and abroad have proved that urea can be used for other purposes in addition to top dressing.
Adjust the amount of flowers
In order to overcome the size of the apple tree, in case of young age, 5 to 6 weeks after flowering (the critical period of apple flower bud differentiation, when the growth of the shoot is slow or stopped, the leaf nitrogen content shows a downward trend), and the leaf surface spray 0.5 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.
Thinning and fruit thinning
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 a higher concentration (7.4%) to show good results, and the most suitable concentration is 8% to 12%. Within 1 to 2 weeks after spraying, the sparse flowering can be achieved. The purpose of fruit thinning. However, under different land conditions, the reaction of different periods and different species still needs further tests. 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 parents, 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.
Pest control
With appropriate amount of urea, washing powder, fresh water and spraying at a mixing ratio of 4:1:400, spraying can prevent fruit trees, vegetable aphids, red spider, cabbage caterpillar and other pests, and the insecticidal effect is over 90%.
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There is no pressure gauge and pressure relief, so as to observe the pressure of the thrower and adjust the working pressure value
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