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First, adjust the amount of flowers in order to overcome the size of apples, in the small years, 5-6 weeks after flowering (the critical period of apple flower bud differentiation, the growth of new shoots slow or stop, the nitrogen content of leaves shows a downward trend) Applying 0.5% urea aqueous solution and spraying twice can increase the nitrogen content of the leaves, accelerate the growth of new shoots and inhibit the differentiation of flower buds, and make the annual flowering volume suitable.
Second, the flower of the flowering and thinning peach tree is sensitive to urea but the reaction of the kneading surface is slow. Therefore, the urea and peach nectar have been tested by the foreign countries for the fruit thinning test. The results show that the peach and nectarine are sparse. If a large concentration (7.4%) is required to show good results, the most suitable concentration is 8%-12%, and within 1-2 weeks after spraying, the purpose of thinning and thinning can be achieved. However, under different land conditions, the response of different periods and different varieties needs further testing.
3. Rice seed production In the hybrid rice seed production technology, in order to increase the outcrossing rate of the parents, in order to increase the amount of hybrid rice seed production or the number of sterile lines, the erythropotox is used to spray the female parent to reduce the female parent. The degree of neck can be completely extracted or sprayed on the parents to adjust the growth of the two to synchronize the flowering period. Because of the relatively high price of gibberellin, the cost of seed production is high. People use urea instead of gibberellin for experiments. 1.5%-2% urea is used at the booting stage and at the beginning of the earing stage (20% heading), and its breeding effect is similar to that of gibberellin, and does not increase the plant height.
Fourth, pest control With urea, washing powder, water 4:1:400, stir and mix, can prevent pests such as aphids, red spiders, cabbage caterpillars on fruit trees, vegetables, cotton, insecticidal effect of more than 90%.
V. Urea Iron Fertilizer Urea forms chelated iron with Fe2+ in the form of a complex. This organic iron fertilizer has a low cost and is effective in preventing iron deficiency and chlorosis. In addition, 0.3% urea was added to the foliar spray of 0.3% ferrous sulfate, and the effect of controlling chlorosis was better than that of single-spraying 0.3% ferrous sulfate.
Source: "Agricultural Business"
New use of urea
Urea is a commonly used fast-acting nitrogen fertilizer. In addition to topdressing, there are many other uses.
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