Weeding techniques for planting traditional Chinese Medicinal Materials

Chemical control is generally used to control weeds in planting Chinese herbal medicines.

I. points for attention

1. Pay attention to the selectivity, specificity and timeliness of chemical herbicides and should not be misused or misused.

2. Strictly control the limited dose. The use of herbicides should be based on the specific soil quality, considering the farmland microclimate, and strictly according to the dose range, concentration and dosage specified in the drug instructions.

3. Reasonable mixed use of medicament. When two or more herbicides are mixed, the proportion, application time and spraying technology should be strictly mastered, and whether there is resistance or other side effects should be considered. A small amount can be taken first for miscibility test, and if precipitation, flocculation, delamination, floating and deterioration occur, indicating that its safety has changed, it can not be mixed. In addition, attention should be paid to the synergistic function of the mixture, such as the herbicidal efficacy of the mixture of herbicide and paspalum is greater than the sum of the herbicidal efficacy of each single agent, and the dosage of the mixture should be reduced (generally less than half of each single dose) to avoid drug damage. ensure the safety of medicinal materials.

4. Pay attention to the isolation of pesticide application and the direction of the wind, the fog droplets are not too fine, so as to avoid drug damage to the adjacent farmland, and pay attention to the impact on the next crop.

5. Master the best time and technical operation points of herbicide application, properly preserve the herbicide, prevent misuse, and do a good job in cleaning spray utensils so as to avoid misuse and cause drug damage to other crops.

6. Pay attention to the influence of environmental conditions on herbicides, such as temperature, moisture, light, soil type, organic matter content, soil tillage and soil preparation level, all directly or indirectly affect the weeding effect of herbicides.

7. Use drugs flexibly. Medicinal plant base herbicide and soil method should be carried out under the condition of no dew, so as to avoid the damage of stems and leaves in contact with the liquid. For the chemicals sensitive to crop seedlings and germs, the soil treatment should be applied before and after sowing, and the sowing quality should be improved as far as possible and the sowing amount should be increased appropriately. Some transplanting medicinal materials because of their large seedlings, and weeds are young, can take the seedling belt (20ml 30cm wide near the seedlings) concentrated application. Resistant to poor selectivity or contact herbicides to implement protective application, that is, the solution is directly sprayed or poured on the soil surface, do not touch the seedlings as far as possible, and can not be delayed until the seedlings are exuberant and the green leaf area is large. If stubble is allowed, measures such as dry land watering, paddy field wetting and film mulching can be taken before planting to make weeds germinate ahead of time and then be killed with pesticides.

8. At present, there are no herbicides specially used for medicinal materials on the market, and most herbicides are borrowed from vegetables, fruit trees and other herbicides. Therefore, herbicides must be purchased or carried out under the guidance of experts or technicians with practical experience, so as to avoid economic losses and adverse consequences.

II. Application of pesticides

The common weeds in medicine field are paspalum, dogtail grass, thrush grass, Rabdosia angustifolia, Euphorbia angustifolia, Euphorbia angustifolia, white grass, amaranth, purslane, chicken crown, polygonum quinoa, pig hair cabbage, solitary purse, shepherd's purse, water peanut, ash vegetable, field spiral flower and so on. These weeds not only compete with medicinal plants for nutrients and water in the soil, but also worsen the environment, spread diseases and insect pests, and seriously affect the yield and quality of traditional Chinese medicine. In the process of weed control, different weeds should be controlled by different methods according to their different properties, and chemical weeding should be selected, which can not only save money and labor, but also be more thorough, and can get a better control effect.