The main reasons for the severe occurrence of barnyardgrass are the variety of barnyardgrass, the large variation among species, and the long survival time of seeds, and some of them can survive for several decades. Once the germination conditions are met, they can sprout long. Second, the lack of medication, soil moisture is not enough when the drug is used, the early control effect is not good, serious late rush grass. The third is that valerian has developed resistance to some of the agents and has increased drug resistance. Fourth, improper use of herbicides. Closed herbicides only have an effect on weed seeds during germination. Stem and leaf treatment herbicides only have effects on weed stems and leaves, and different herbicides have different uses. If dicloquinoline sodium salt does not have to be drained before application, there should be no stagnant water in the field before the application of quinclorac and Penoxsulam (InJ). The fifth is that the best application period has not been captured, resulting in an overgrown grass. Sixth, relying on the rain of the heavens, artificial water supply is not suitable when it is not suitable. After application, it is impossible to ensure that the field is moist or has a shallow water layer, resulting in a significant reduction in weed control effects.

The control method of direct weeding on dry land in paddy field is a long period of symbiosis between weeds and upland rice. It is difficult to control the weeds in the whole growing season with one application of pesticides. Most of the production uses the seal (closed before the sowing of the soil to control the treatment of buds), kill (the treatment of stems and leaves in the early post-emergence), make up (in the delivery period) three times weeding. Pre-embedment treatment: 30% pretilachlor EC (plus safener) 100-150 ml per mu or 40% propyl benzyl with 60-70 g per mu (including safener), after sowing 2~3 days after sowing) Spray 30~50kg on the ground. 50% butachlor granules used 1 kg per acre. After plowing, the seedlings were applied before planting. After 3 days, they were planted again, or 50% butachlor EC was used with 150-200 ml per mu, and surface spray was sprayed within 2 days after sowing. 42% Ding EC, spraying within 3 days after sowing, 100-150 ml per mu surface water spray of 30-50 kg. After application, keep the field moist, but no water, the effect is good. The above methods have better control effects on barnyardgrass, and can eliminate thousands of gold. In contrast, herbicides formulated with isoproturon, with water or with increased temperature, have increased activity and die-off phenomenon, and should be carefully selected. Post-emergence shoots and leaves treatment: For the direct-seeded rice field with closed or poor weeding effect, stem and leaf treatment is a supplement. The second control can be carried out in the second to third leaf stage of barnyardgrass. 2.5% Penoxsulam chlorinated oil suspoemulsion (Daijie), 40-60 ml/mu, 30 kg water (15 kg water plus 5 g silicone) sprayed; 35% dichlorobenzyl WP wettable powder per mu Mu 40-50 grams, 30 to 50 kilograms of water (15 grams of water plus 5 grams of silicone) spray evenly. Complementing the tillering period: If the weeds in the field are severe due to the poor early weed control effect, they can be used during the 5-7 leaf stage of dry rice. At this time the larger grass (4 to 5 leaf stage), can be used 10% agricultural Meili suspoemulsion (bispyrine) 30 ml per acre, plus 5 grams of silicone, spray 15 kg of water. For the above three methods, keep the field moist after application, 48 to 72 hours after the drug, if there is rainfall, and shallow water in the field, do not have to discharge; if there is no rainfall, artificial water can be provided to maintain 3 to 5 cm of water Layer 3 to 5 days, the effect is better. If there are sedges and broad-leaved weeds in the field, Benazepine and other preparations can be used, and operations can be mixed to control them together. The method is: In the late stage of late rice tiller (cannot be later), use 25% Benzonsone 150 ml, add 20% dimethyl tetrachlorine 150g, spray 30kg (15kg plus silicone 5g) stems and leaves.

In short, the control of weeds mainly in weeds in dry paddy fields should follow the principle of “scientific use of drugs, early prevention and early treatment”, and aiming at the cultivation methods of upland rice, we should look at the grassy phase, select the correct drugs, strictly use the dose of pesticides, and apply pesticides. The appropriate period, the use of technology, the use of pre-embryed, post-emergence stem and leaf treatment combined with prevention and control methods, control of public opinion, do a good job of field water management, the only way to achieve the best control effect.

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