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Herbicide weeding before sowing. This is the most important period of weeding. The farmers should strive for a single application to ensure that the herbs are not harmed by weeds during the whole growth period. The available drugs are 48% trifluralin and 50% acetochlor. 48% trifluralin can effectively control annual grass weeds that are propagated by seeds, such as crabgrass, goosegrass, etc. It can also control broadleaf grasses with small seeds. Its field duration is 2 to 3 months. . Seed herbs in the 5 to 10 days before sowing, weed germination buds before, per acre with 48% trifluralin EC 80 ~ 100 ml of water 40 ~ 50 kg on the top surface of pharmacy spray. Immediately after spraying, the soil was turned 5 to 7 cm. 50% acetochlor mainly stops the growth of weeds and roots, has special effects on a variety of annual grass weeds, and can also remove some of the small-grained seeds of broadleaf grasses. 50% acetochlor should be applied before sowing (also shortly after sowing) or 3 to 5 days prior to transplanting after transplanting. 70-75 ml of agent per acre is used to uniformly spray the surface soil of 40-60 kg of water. It is worth noting that the medicinal herbs should not be used.
After herbicide sowing herbicide before sowing. 20% traceless water and 41% Roundup can be used. It takes 10 to 30 days after sowing to produce medicinal materials such as windproof, bupleurum, etc., 20% of traceless water agent per mu, 150 to 250 ml of water, 25 to 30 kg of water, or 41% of Dunda water agent 150 to 200 Milliliters of water to 30 to 40 kilograms, see green in weeds and herbs before spraying, remove weeds. Herbs must not use these two agents to weed after emergence to avoid killing the seedlings.
Herbicide after weeding. Can choose 6% Kecaoxing EC and 8% Hibiscus. 6% Kecaoxing has a good control effect on annual weeds and broadleaf weeds, and also has a significant inhibitory effect on perennial weeds. Each mus of 6% Kecaoxing 70 ~ 80 ml of water to 30 ~ 40 kg, spraying at an average height of 5 cm below the weeds. 8% of high-efficient straw can be applied for a long period of time, broad spectrum of grass, can effectively control annual grass weeds such as goosegrass, crabgrass, Setaria, Bermudagrass, Rhizoma Imperatae and other perennial weeds. Generally, 25-30 ml of water is used per acre for 20-30 kilograms of water, and a fan-shaped sprinkler is used for spray treatment of stems and leaves during the 3-6 leaf stage of weeds. Ganoderma lucidum has no effect on Radix Astragali, Atractylodes macrocephala and other broad-leaved medicinal herbs, but it is harmful to Gramineae medicinal herbs such as alfalfa.
Medicinal weed control
In the cultivation process of Chinese medicinal materials, the growth and quality of weeds often affect the yield and quality of medicinal materials. Manual removal of weeds in the fields is laborious and time-consuming, and it is difficult to ensure the quality of weeds. At present, there are not many herbicides that can really be used in large quantities in the production of medicinal herbs, and most of them are still in the experimental stage. According to the production practice experience, the author now recommends to herbicide farmers three stages of weeding before sowing, after sowing, before emergence, and after emergence.