Rice field weeds are one of the main factors affecting rice yield. For example, the management of whole fields and water slurry is unlawful, or it is not timely, it is easy to cause grass damage and even grass shortage. This year, there are more interest fields, and the number of weeds in the field is high. The hidden dangers of grass damage are large. If not removed in time, it will seriously affect rice production. All localities should continue to promote the comprehensive control system for weeds in rice fields based on the control of grasses based on agricultural measures, the focus on chemical control of weeds, and the selection of safe and efficient medicines, and strengthen publicity. According to different seeding methods, local conditions, classification guidance Farmers select the drug types, master the control methods and supporting technologies to ensure the safe growth of rice. Specifically:
1 machine inserted rice Daejeon closed weeding technology
(1) Pay attention to the closed weeding technology in Daejeon before planting. It is very beneficial to the weed germination of weeds during the sedimentation of the soil in the paddy field, especially in the fields with high weed numbers and poor water retention in previous years. After simmering in the field, use 50% of acetaminophen (Rivite) emulsifiable concentrate 70ml or 50% butachlor 100-120ml per acre to spray evenly or mix the fine soil evenly into the field water until the soil sinks. After the machine is inserted, it can play the role of actively controlling grass and reducing the weed base. Matters needing attention: the surface of the field should be level, the ditch should be matched, the field water should not be too much when the medicine is used, the field water after the medicine should be naturally dried, and the water should not be released at will to prevent the loss of the liquid and affect the weeding effect.
(2) Comprehensively do a good job of chemical weeding with poisonous fertilizer after planting. The rice transplanting machine is wide-row planted. The space ecology in the early stage is very beneficial to the weed growth, and there are many kinds of weeds. The treatment with poisonous fertilizer before weed emergence can have a multiplier effect. Use 53% of bensulfuric acid benzoyl (first acyl) wettable powder per mus (1 pack) + 10% bensulfuron WP 1-10g (1~2 packs), uniformly mix 6~8 kg of urea In the early stage of weed germination 3 to 5 days after machine insertion, the poisonous fertilizer method was applied. Note: 1 machine rice seedlings must reach 4.5 to 5 leaves to apply the drug; 2 must be evenly applied after the dew is dry, the fertilizer must use urea, can not be mixed with other fertilizers. 3 After the application, the field should be kept in a shallow water layer for 3 to 5 days. It is strictly forbidden to infuse the heart leaves by deep water; 4 This formula is limited to the machine for rice field, the field and the direct seed rice field cannot be used; 5 the medicine fertilizer should not drift to other broad leaves. crop.
2 Direct seeding rice chemical weeding technology
(1) Adhere to the weeds before the sowing. There are many kinds of live winter field or wheat field in the field, and there are many kinds of weeds in the field. The density is high and the growth is large. It must be 6-8 days before the live broadcast. 41% glyphosate isopropylamine Salt (Nongda) Water 200 ml water to 30-40 kg spray to control weeds in the field and around the field, ditch, clean the pastoral ecological environment, reduce some pest host.
(2) Adhere to the soil sealing treatment. 1 Water direct seeding rice field: 2 to 4 days after sowing, use 30% acetochlor (Swift or direct friend) emulsifiable concentrate 100-130 ml + 10% bensulfuron-methyl WP 15-20 g; or 30% benzyl Pyrimidine (Longping smile) emulsifiable oil 120 ml water 30-40 kg small machine spray fine mist; 2 dry direct rice paddy: 33% dimethoprim (Shi Tianbu, rice-specific) emulsifiable oil 120-130 ML+10% bensulfuron-methyl WP 20-30 g is sown in rice and drenched with water. After spraying, the machine is evenly sprayed with water. After the drug is applied to the seedling stage, the mulberry surface is moist and does not accumulate water. Water, normal management after the three-leaf period. Matters needing attention: 1 Spraying should be even and thoughtful. When using dry rice for special use, the rice mist can not be misted, and the side of the field and the ditch inside the field should not leak. 2 Adhere to the application of 2 to 4 days after sowing, especially for large farmers who cannot wait until the end of all sowing. Otherwise, they will often miss the proper application period and affect the weeding effect. 3 Fields with poor water retention conditions should be promptly used when the humidity in the field is high to improve the weeding effect. 4 Live rice paddy must be leveled to prevent phytotoxicity caused by low water.
3 Rice field mid-field chemical removal technology
According to the grass and grass conditions in the field, adhere to the principle of “except early and small†and use herbicides to prevent them. The specific formula is as follows:
(1) To control the field of alfalfa, Qianjin, and Matang, and to control the weeds 2 to 3 leaf stage with 10% oxazolamide (Han Qiuhao) emulsifiable concentrate 100 ml + 10% cyanide The ester emulsifiable concentrate is 100 ml; after the weed 4 leaf stage, the dosage is appropriately increased according to the age of the grass. Use Hanqiu good pharmacy to pay attention to its mixed use, can not be mixed with herbicides such as bensulfuron-methyl and pyrazosulfuron-methyl, and cannot be mixed with other emulsifiable agents.
(2) In order to prevent the removal of alfalfa and broad-leaved grasses, the use of 2.5% penoxsulam (Taojie) emulsifiable concentrate is 80-100 ml.
(3) In order to prevent the sedge-based field, 10% of the pyrisulfuron-methyl (turf) WP can be used in 10 to 15 grams.
(4) Single field of broadleaf grass, with 56% dimethyl tetrachloride (Nandos) WP 30-40 g or 460 g/L dimethyl chlorpyrifos (Valley) solution 100 to 120 ml, mastered in the late stage of rice tillering, spraying in the field of weeds 3 to 5 leaves in the absence of water. Note: Do not drift to the surrounding broad-leaved crops to avoid phytotoxicity.
(5) Fields with complex grasses, mixed monocotyledonous weeds and high density, with 6% pentacene-cyanofluoride (rice) emulsifiable concentrate 100-150 ml.
Application requirements: The dosage per acre is 30-40 kg for water spray, and the mist spray machine can not be used. When spraying, the field is required to moisten the water layer, and the water is applied 24 hours after the medicine to restore the conventional water slurry management.
All kinds of herbicide packaging materials should be taken away from the farmland in time. After applying the medicine, the water should not flow into the river pond to prevent poisoning accidents of aquatic animals.
More pesticide knowledge , please pay attention to China Pesticide Network
Chloride, Salt
YIBIN PERFEC INTERNATIONAL TRADE CO.,LTD , https://www.yibinbofei.com