In the past, farmers often used the techniques of “deep deep hole planting, deep arable land, and wide-fertilizer cultivation†to make the quality of the fruit difficult to raise. The restriction of the root zone broke through the traditional cultivation theory of “deep tree roots†and “deep rooted leaves.†Years of research have shown that grape growth does not necessarily have to be “deep in root†to “leaf a leafâ€, and limiting the range of root growth can also be “leavingâ€. The groundwater level in the southern area is high, and the root system is distributed in the soil layer with water accumulation. It often absorbs too much water, which affects the sugar content of the fruit and the formation of pigment in the skin. This is because the ripe fruit has low sugar content, poor coloration and low taste. The main reason. The use of plastic film and other materials limits the root growth to a narrow range. The root system cannot extend beyond the root zone to absorb water. Fertilizer nutrients placed in the upper layer of the root zone can also be fully absorbed by the dense root system and rarely lost. Therefore, the precise supply of water and nutrients according to the growth and development needs of the grapes can be used to control the growth, fruiting and fruit quality of the shoots on the ground. In the northern regions, this technology can be used to grow wine grapes and save water and fertilizer. At the same time, it is also possible to use the technology to locally grow wine in the saline-alkali land through the root zone, and to rationally develop and utilize the resources of the saline-alkali land. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone
Preparation of Fenebute
1. Prepare the first intermediate
Benzaldehyde and ethyl acetoacetate into ethanol, stir at room temperature under the catalysis of organic alkali reaction with filter cake filtration after 45 ~ 50 h, after the completion of the filter with ethanol elution filter cake, dry cake solids, then ethanol filtrate concentrated to a quarter of the original volume, to cold, concentrate filtering alcohol washing, solid, merging two solid is the first intermediate; The mole ratio of benzaldehyde, ethyl acetoacetate and ethanol is 1:2.5 -3:12-15.
2. Prepare the second intermediate
The first intermediate is added to the mass concentration of 20% sodium hydroxide solution, and the reaction is stirred at 85-90°C for 2-5 hours. After filtration, the filter cake is used for filtration. After filtration, the filter cake is washed, the filtrate is combined and cooled, and the filtrate is cooled by stirring for 3h. Solid second intermediate; The mass ratio of the first intermediate to the sodium hydroxide solution is I: 1.8-2.0;
3. Prepare the third intermediate
The second intermediate was dissolved in pure acetic anhydride solution for reflux 3 ~ 5h. After the reflux, the acetic anhydride was concentrated and dissolved with toluene. After the dissolution, ammonia water was added, and the reaction took place at 60_65°C for 1 ~ 1.5 h. Filtrate, wash and dry the precipitated solid to get the solid third intermediate; The mass ratio of the second intermediate, pure acetic anhydride solution, toluene and ammonia water is 5:1-1.2:0.5-0.8:0.5-0.8;
4. Prepare Finebute
The third intermediate was dissolved in 25% sodium hydroxide solution and cooled to _5°C ~ 10°C. After cooling, sodium hypochlorite was added slowly within 15-20min for 1h reaction, followed by ice bath reaction of 0.5 ~ 1.5 h and water bath reaction of 0.5 ~ 1.5 h. Finally, the temperature was gradually increased to 60 ~ 80°C for 1-5 h, and the reaction was cooled again after completion. After cooling, hydrochloric acid was added in the ice water bath to adjust the PH to 2, and the decolorization was stirred at room temperature. After filtration, sodium hydroxide was added in the ice water bath to adjust the PH to 6-7, and the cooling was stirred for 2 hours. The mass ratio of the third intermediate, sodium hydroxide solution and sodium hypochlorite is 1.0:0.8-1.0:1.0-1.1.
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Grape roots limit the precise supply of fertilizer
The root zone restriction is the use of physical or ecological methods to limit the growth of grape roots within a certain volume range, and to regulate the growth, fruit setting and fruit quality formation of shoots in the shoot by regulating the growth environment, nutrients, and moisture supply of the root system.