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 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.
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. Mixing with a proper amount of urea, detergent, and water at a ratio of 4:1:400, spraying can prevent pests such as fruit trees, vegetable aphids, red spider, cabbage caterpillar, etc., and the insecticidal effect is over 90%.
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