Control of weeds in rice fields
Rice field weeds are an important factor influencing the high yield and quality of rice. Not only does it compete with rice, win light, and contend for space, it affects the normal growth of rice seedlings. It also becomes the intermediate host and propagation medium of rice pests and diseases and aggravates the damage degree of rice pests and diseases. Chemical weeding has the advantages of rapidness, high efficiency, and labor saving, and is currently the key measure to control weeds in paddy fields. The chemical control of weeds in paddy fields should be based on prevention. Weeds should be eliminated as much as possible during the germination and seedling stages.
1. Direct weed control in rice fields
The simultaneous growth of weeds and rice in direct-broading rice fields and the long period of occurrence, combined with alternating wetting and drying after sowing, are very conducive to the growth of weeds such as xerotic and wet conditions. Therefore, weed species are numerous and weeding is difficult. High standard. Only according to the law of occurrence of weeds in direct-seeded paddy fields, we can use the drugs on the road and master the techniques of pesticide application to safely and effectively control weeds in direct-seeded rice fields. At present, the chemical weeding system for direct seeding in paddy fields has formed a technological system of “one, two killing, three supplementsâ€.
"One letter": Before the seedlings are sowed, the rice is irrigated once, and after the water is naturally dried, the first chemical weeding is performed. It is possible to select 42% of dioxins EC 120-150ml or 40% propylbenzyl 80-120g, and dilute 40-50kg of water evenly on the surface of the soil to effectively control the occurrence of the first grassy peak.
"Two kills": Due to the large amount of weeds in direct-seeded paddy fields and the long period of weeding, it is usually impossible to control all weeds at a time. Therefore, the prevention and control of weeds in rice fields in the middle period should be done well. The type of weed should be prescribed for the remedy. The prevention of thousands of gold per acre can use 10% cyhalofop-ester 60-80 ml, watering 50 kg for stem and leaf spray treatment; control weeds, crabgrass and other weeds, you can first drain the field water, and then per acre Use 50% quinacridine wettable powder 40-50 grams, mixed soil 15-20 kilograms evenly applied to the field.
"Three supplements": In the late stage of the growth of direct-seeded rice, broad-leaved weeds and Cyperaceae weeds are more harmful. Before the jointing of rice, the field can be filled with 3-5 cm deep water layer, with 10% bensulfuron-methyl wettable powder 30 g plus 20% dimethyl tetrachlorine 150 ml per mu, evenly sprayed with 30 kg of water. Keep the water layer for 4-5 days after application.
2. Control of weeds in transplanting rice fields
(1) Control of weeds in Putian
Before seedling emergence, 100 ml of 60% butachlor was applied per acre, and 50 kg of water was evenly sprayed on the surface of the soil for soil sealing treatment.
In the two-leaf and one-heart stage of seedlings, in the 2-5 leaf stage of barnyardgrass, 30% chloroquine acid WP is used per acre, and 35 kg water is evenly sprayed to treat the shoots and leaves at the seedling stage. After the application, pay attention to keep the bed. Wet face.
(2) Weed control in field
After 4-6 days of rice transplanting, first pour 3-5 cm deep into the paddy field, taking care not to flood the rice leaf, then use 60% butachlor EC 100 ml per acre and 20 kg acetochlor in the paddy field. Spread evenly in the water, and after application, keep the water layer 3 to 5 centimeters deep for about 5 days to effectively control weeds and sedge weeds.
At the jointing stage of rice, water is first poured into the paddy field at a depth of 3-5 cm, and then 30 g of 20% benzethonium bismuth powder per acre or 14% of a strawweed wettable powder, 40-50 g of a mixed damp soil, 20 kg of water is dried evenly after the dew. Spread to paddy fields and keep the water layer for about 5 days. Can prevent grasses, sedge weeds, broadleaf weeds and other weeds.
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