In recent years, the increase in the area of ​​dryland rice has become a new bright spot in agricultural production in mountainous areas. How to prevent weeds is an important measure to develop rice dry seeds and ensure increased yield and income. Chemical weeding has the advantages of fast, efficient and labor-saving. According to the survey, there are many types of weeds in dry rice fields, among which the main damages are valerian, ragweed, crabgrass, leeks, gray vegetables and triangle vegetables. Weeds generally showed the first emergence peak 7 days after sowing, mainly grasses and crabgrass in grasses; the second grassy peak appeared around 20 days after sowing, mainly broadleaf weeds; About a day, the amount of weeds is small, and the growth potential of the dry rice population is strong, and the growth potential of the late weed population is weak, and generally cannot be harmed. It can be seen that 20 to 25 days after sowing, weeds account for about 85% to 95% of the total weeds in the whole growth period, which is the focus of weeding. According to the law of occurrence of weeds in rice fields, when weeding with chemical agents, according to the different grass phase conditions, the right-handed medicines should be selected, and the medicines should be used at the right time, and the medicines should be applied evenly to ensure and improve the elimination effect. The control measures for weeds in upland rice fields are the same as those in rice basic fields, but they are more suitable for the characteristics of dry fields in terms of the varieties and methods used. Chemical weeding in dry fields must be leveled and fined. When spraying, increase the amount of liquid spray, which is conducive to uniform application, overcome the influence of soil moisture and affect the efficacy of the drug, especially the quality of application. The method of spraying should be sprayed. When spraying with a knapsack sprayer, avoid stepping on the field after spraying to avoid affecting the weeding effect. After sowing, the pre-emergence treatment is mainly based on soil closure, combined with stem and leaf treatment at the seedling stage. ―About 10 days after sowing, use 60% of butachlor EC 200ml, 48% zhongdingling emulsifiable concentrate 300ml and 72% sodium dimethyltetrachloride powder 50g per acre (the amount of sodium dimethyltetrachloride should not exceed ), spray 75 kg of water (5 back pot of water). The amount of water must be increased when the soil is dry, which is an important part of determining the herbicidal effect of the herbicide. In order to improve the sealing effect of the medicament, it is necessary to crush the surface clods with tweezers before spraying, in order to facilitate the formation of the film on the soil surface. The second application is stem and leaf treatment (combined with soil for chemical treatment). After the emergence of dry rice, when the grass is 2 leaves, the sun is used, and 60% of the butachlor EC is added per acre plus 20% of the enemy milk 750 ml. , or 60% butachlor EC 300 ml, 1:150% chlorpyrifos WP 25 g, spray 40 kg of water. The problem of chemical weeding in dry paddy fields: 1 Ensure the quality of the land preparation, require the surface of the field to be flat, prevent the unevenness and cause the phytotoxicity and poor control effect. 2 The correct choice of herbicides, chemical weeding fields, the correct choice of herbicides according to weed species and rice growth, in order to improve the overall weeding effect. 3 Appropriate application, so that the period when the rice seedlings are suitable for the herbicide is consistent with the suitable period for the herbicide to effectively control the weeds. 4 Weigh the quasi-drug. When applying the herbicide, the dosage should be weighed, so that the area is first counted and then weighed to prevent the drug from being too large to produce phytotoxicity or insufficient dose to affect the control effect. 5 evenly apply, the agent and water should be evenly mixed, keep the spray concentration - especially, when spraying the wettable powder, pay attention to the stirring during the spraying process, so as to avoid the concentration of the bottom of the barrel is too high, causing crop damage. In the preparation of toxic soil, the agent should be thoroughly mixed with the fine soil. During spraying and spreading, apply evenly to prevent heavy application.
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