Premature sowing, excessive sowing, and too much N fertilizer in the base fertilizer will lead to the growth of wheat. Prosperous wheat has low intracellular sugar and various organic nutrient concentrations and high freezing point. Especially after young spike differentiation enters the Erlang period, the ability to resist coldness is reduced, and it is extremely vulnerable to freezing injury. The light leaves dead and the whole plant is dead. , directly affect the wheat yield. Prosperous young wheat seedlings grow lushly, with many stems and pods, large leaves, elongated internodes, weak stalks, less dry matter accumulation, poor root development, and hidden dangers for later lodging.
The use of physical control methods, such as repression, deep squats, heavy workload, and time-consuming work. Using the chemical control method to save time and labor, and to do more with less, wheat without herbicide before winter can be sprayed together with the control agent.
At present, the best wheat control products on the market, the mechanism of action are mostly to make the wheat roots robust, shorten the internodes, and lay a good foundation for wheat to shape the ideal plant type. Internode shortening in wheat refers to the reduction of the distance between 1 and 3 knots at the bottom of wheat. The control was early, affecting the return of wheat to the jointing season, and the wheat did not reach the ideal height. Control late, the bottom of the 1-3 section of wheat has been normal growth and development, the bottom of the internode fixed height, and then contraction will shrink between the middle section, the formation of the upper and lower internodes, inter-coarse internodes, but easier to lodging. In addition, after the jointing period, the wheat enters the booting stage, and the vegetative growth gradually shifts to reproductive growth. At this time, the re-warming may easily lead to the delay of wheat heading, inconsistent heading or inconsistent crops, affecting flowering and pollination, and affecting wheat yield. To remind farmers in this area, we must carry out chemical control and prosperousness in the early days of returning to the beginning of the jointing season.
What needs to be reminded is that wheat control is prosperous, not shorter. Because the growth and development and flowering of any crop require a lot of nutrients, if there is no reasonable height and there is no accumulation of sufficient nutrients, there is no potential for high yield. While controlling the plant height, it promotes the development of wheat roots, thick stalks, and better toughness, so that the lodging resistance of wheat is stronger. This is the goal of controlling Wang.
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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.
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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