In summer, the weather is hot, and there are more problems to be aware of when spraying crops. The efficacy of most pesticides will increase with the increase of temperature. Therefore, you should pay attention to reducing the dosage of the liquid medicine when using the medicine in the hot season, so as to produce the effect of hitting once and topping twice.
Improve pesticide utilization
Pay attention to increase the adhesiveness of the medicine. When using pesticides in open-air crops, you should choose those that are resistant to rain erosion. Emulsifiable concentrates are more appropriate. These pesticides have a longer residual time on the plant surface, while powders and aquas are relatively poor. In many crops, there are fluff or thick waxy layer on the leaf surface, such as corn, green onion, ginger, taro, etc. The medicinal liquid is easy to form droplets on the fluff and waxy layer, and cannot fully contact the surface of the plant leaf. Add organic silicon and other additives to the medicine to enhance the effect of the medicine.
Appropriately reduce the concentration of the agent
The efficacy of most pesticides will increase as the temperature rises. Therefore, you should pay attention to reducing the dosage of the liquid medicine when taking the medicine in the hot season, especially the hormone medicines. The heavy dosage can easily lead to phytotoxicity. occur. Therefore, the concentration of the agent should be adjusted reasonably according to the temperature change.
Pay attention to spray quality
In fact, when crops are sprayed with pesticides, there is a limit to the pesticide droplets that can be attached to the surface of the crop leaves. When the spraying amount exceeds a certain limit, the small droplets on the leaves will condense into large droplets and roll off and lose. Reduce the amount of pesticides attached to the leaves.
The spray method generally requires the sprayed droplets to be distributed uniformly and with a high coverage rate. It is advisable to wet the surface of the plant without dripping. In this way, the sprayer used is required to atomize and reduce the waste of liquid medicine. At the same time, pay attention to the comprehensive spraying, especially some pests like to lay eggs on the back of the leaf. Pay special attention when spraying the pesticide.
Reasonable spraying to prevent poisoning
Finally, I would like to remind farmers: the summer is hot and the skin metabolism speeds up. Before applying pesticides, you must take protective measures. Be sure to wear a gas mask, long clothes and long pants to prevent pesticide poisoning through breathing and skin penetration.
It should be done before 9 am or after 4 pm. It is forbidden to spray pesticides at noon high temperature in summer, and the continuous spraying time should not be too long. Spray drugs downwind and regress. If pesticides contaminate the skin, wash them immediately. Once you have symptoms of discomfort, you should go to the hospital immediately.
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Plant extraction process
1. Select plants/medicinal materials. It is nothing more than ancient prescriptions, proven prescriptions, and folk medicinal herbs. At present, common and uncommon medicinal materials have been studied. Most of the time, the amount of medicinal materials has been increased to extract low-isolated components, or medicinal plants have not been studied from Miao medicine, Tibetan medicine, Mongolian medicine, Africa, Latin America and other places.
2. Extract. Solvent petroleum ether, n-hexane, cyclohexane, benzene, chloroform, ethyl acetate, n-butanol, acetone, ethanol, methanol, water (small polarity → large polarity). Daily decoction of medicines is effective, use water and ethanol and other solvents with high polarity. Artemisinin and other boiling methods are not effective, use petroleum ether and other solvents with low polarity. The common medicinal materials, water/alcohol/ether, are presented again, and more compounds can be separated and identified.
3. Separation. This is the most important task. There are dozens of compounds in the solution extracted in the second step. Generally, column chromatography is used, which is what we often call column flushing. The workload is large, boring, and low-tech. A master's degree may do this every day for 2 years of experimentation. As shown in the figure below, the column for separating compounds is as large as 2 meters high and as small as 10 cm. Change the solvent conditions of the mobile phase, change the material of the column, and repeatedly wash the column under different conditions and separation principles to separate the monomer compound.
High Content Monomer,Kudzu Root Powder,Magnolia Bark Extract Powder,Golden Turtle Lotus Extract
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