In general, since the rice seeds in the direct-seeded fields are sown directly on the soil surface, the young sprouts and roots grow on the soil surface, and the rice sprouts and young roots are sensitive to most herbicides, so many herbicide varieties It cannot be used directly in the field of direct seeding in the early stage, such as Ruifite, butachlor, saphos, benzofen, lt; img class="scrollLoading" src="http://47.94.224.236/baidu/daotianzacaofangchujishuwenda/ 19787109121980020001_0200_1.g if Trifenfen (not available for japonica rice), penoxsulam, pyfenfenfen, etc. Among them, clofenac and tetraconazole are harmful to rice in the bud stage and should be used after the 1.5-leaf stage of rice; quinclorac is harmful to rice. There is phytotoxicity in rice before the 2-leaf stage, so it should be used after the 2.5-leaf stage. To control broadleaf weeds, pyrazosulfuron-methyl, bensulfuron-methyl, ciprosulfuron-methyl, ethoxysulfuron, etc. can be used in the late-stage direct-seeded fields. Broad-leaf weeds and perennial sedges can be treated with a mixture of pyrimidine, bifenfen, bentazone and dimethyltetrachloride.
Direct-seeded rice can be divided into two types: water-directed rice and dry-directed rice. Category: dry direct seeding can be divided into two types: dry sowing water tube rice and dry (land) rice. According to different farming methods, it can be divided into three types: tillage direct seeding and low-till and no-till direct seeding. The general trend is that there are two peaks of weed occurrence in direct-seeded rice fields. A comprehensive control strategy focusing on chemical control and combining agricultural control with chemical control should be implemented, using seedlings to suppress weeds, using drugs to kill weeds, and using pesticides to control weeds. Use water to control weeds and use manual weeding. The chemical weeding technology system of one application, two removals and three treatments should be adopted in a timely manner. Specific areas or fields can be one application, one application, one removal, one application and one application, or one-time weeding. .
1) Before sowing, 200 grams of 30 glyphosate soluble powder (or 200 ml of 41 glyphosate aqueous solution) can be used in various places according to local sowing, cultivation methods, and grass density. ), spray before sowing, plow and prepare the land after weeding, and then water and dry sow. You can also dig and level the trenches before taking advantage of the mixed water (water layer is 3 to 5 cm). Take 75 to 100 ml of 225 Dimethonol EC per 667 meters. , use the original bottle of diclofenac to sprinkle the whole field, and apply the water-retaining layer for 2 to 3 days, and then drain and sow; you can also dig and level the ditch, then fill the water layer, and use 100 ml of 60-butachlor EC per 667 m2 Mix with moist fine soil and spread evenly, wait for 2 to 3 days before the field water dries up and sow. 2) After sowing, 150 ml of 36-butyric acid EC can be used in dry-seeded rice fields; 100 ml, 100 ml of 10 benzylhuanglong, 15 g, 200-250 g of 17.2 young Hebao wettable powder, etc. 3) Post-emergence treatment (two removals or three supplements)
Rice (miscellaneous). Grasses) Different chemical agents can be used for different leaf ages and different weed population combinations. You can choose 50 to 60 ml of 210 kilograms of EC per 667 meters (fields with severe stephanotis), 2.5 penoxsulam oil suspension (fields with severe old barnyard grass) 40 to 80 ml (stem and leaf spray) or 60 ~100 ml (medicine soil spreading); you can also choose 10 Benzyl Huanglong 15 grams 90 high-efficiency herbicide 110 ml, 40 propyl benzyl wettable powder 80 ~ 100 grams, 36 dichloro benzyl wettable powder (or 25 Colloidal suspension) 40 grams (ml), 48 Bendazone 100 ml, 202 Methyl 4 Chloride 100 ml, 96 Hedazhuang EC 150-200 ml, etc.
In particular, it should be noted that the dosage and application technology of each herbicide variety in the various cultivation methods mentioned above are only applicable to most areas or certain areas. Due to the vast territory of our country, ecological problems such as soil and climate, Conditions vary greatly. The above formulas, dosages, medication techniques, etc. are for reference only. Each locality needs to conduct experiments and demonstrations by scientific research and plant protection departments before promotion and application.
Farmers should go to regular pesticide sales stores when purchasing pesticides. They must purchase products with complete "three certificates" produced by regular pesticide companies. They must strictly follow the standards required by the product instructions and apply pesticides under the correct guidance of the local plant protection department to avoid avoidable accidents. unnecessary loss. The purpose of herbicide application is to save labor and agricultural costs, minimize the loss of weeds, and increase production and income. The most important thing to consider is the input-output ratio. You cannot just buy cheap herbicides, you must kill weeds and increase production. Chapter 4 Herbicide harm and prevention