Rice field weeds compete with rice for rice, contend for light, and compete for space, which is one of the main factors that seriously affect rice growth. In recent years, weeds have become more and more difficult to control with the scale of planting, the total amount of straw and the change of weeds in rice fields. At present, there are more than 40 species of weeds in rice fields in China. The grasses with high frequency of occurrence are weeds, thousand gold, double-spotted damselflies (perennial rhizome reproduction), Lishihe (perennial rhizome and seed reproduction), weeds Rice, fake rice; sedge weeds have sedge, water triangle, sorghum (tuber and seed reproduction), water sedge (perennial tuber reproduction), stalk sedge, cattle grass; broadleaf weeds Water leek, scorpion, ragweed, groats, squash, dwarf mushrooms (perennial tuber reproduction), algae lotus seeds, water bamboo leaves, etc. Among them, weedy rice, alfalfa, Qianjin, water leek, and sausage have become the main weeds that seriously damage rice production. In order to ensure the normal growth of rice in our city, the technical opinions on chemical weeding in rice fields are proposed as follows.
First, the live broadcast rice field
1. Before seeding or after sowing
Use 26% oxaloin emulsifiable concentrate 100-120 ml per acre. After the end of the whole field, the muddy water is not precipitated, and the water is kept for 3 to 5 days after application. sowing.
Or within 1 to 3 days after sowing, use 40% bensulfuron-propionamide wettable powder 60-80 g per acre, or 30% bensulfuron-propionamide wettable powder 80-100 g, 30-40 for water Kilograms are evenly sprayed on the soil. When applying after sowing, the field should be kept moist, shallow water should be in the field, the field should be kept wet within 3 days after application, and normal field management should be resumed afterwards; the high temperature will be encountered on the same day or the next day after application. More dry, the next day put "horse water". Sowing the grain must first germination, requiring the root to grow a grain of grain, buds and long grain. Do as with the soil preparation, with sowing.
2, after emergence
In the two-leaf stage of rice (about 15 to 20 days after sowing), 53% of bensulfuric acid-sulfonyl WP 60-70 grams per acre is mixed with fine soil or chemical fertilizer, and there is a thin layer of water in the field when applied. Keep the shallow water layer for more than 3 days after application.
Second, transplanting rice fields
1. Before transplanting: After the summer tillage is flattened, the water layer is filled (until the high pier is not exposed). When the weeds are not seeded, the soil is used with 26% oxaloin emulsifiable concentrate 100-120 ml, and the muddy water is turbid.甩 全 全 全 , , , , , , 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全80 grams, 1 day after spraying 30-40 kg of water.
2. After transplanting: 5 to 7 days after the machine is inserted, use 53% bensulfuric acid/benzophene wettable powder agent (tossing star) 60-70 grams per acre to mix fine soil or chemical fertilizer. There is a thin layer of water in the field, and normal management is resumed after 3 to 5 days of water retention.
Third, mechanical strip (hole) broadcast
It is recommended to adopt a "two seals and one kill" prevention strategy.
"One": 4 to 5 days after sowing, using 40% bensulfuron-propionamide wettable powder 60-80 grams per acre, or 30% bensulfame-propionamide wettable powder 80-100 grams, 30-40 kg of water sprayed the soil evenly. When applying the medicine, the field is moist, does not accumulate water, and there is shallow water in the field. The plate should be kept moist for 3 days after application, and the water shortage should be done. Rice must be germinated and then sown.
"One kill": If the first blocking effect is not satisfactory, there are more weeds in the field. In the 2~3 leaf stage of valerian or Qianjin, 60g/L of pentafluoro·Cyanofluoride (rice) can be used per mu. Disperse the oil suspension agent 100-130 ml, spray 30-40 kg of water on the stems and leaves. Drain the field water before application, rehydrate and retain water for 3 to 5 days after the drug.
"Two seals": 3 to 5 days after the treatment of stems and leaves, after the establishment of the water layer in the paddy field, use 40% bensulfuron-propionamide wettable powder 60-80 grams per acre, or 30% bensulfame-propionamide Wet powder 80 ~ 100 grams, mixed with fine soil or chemical fertilizer application, before the application of the field should have a thin layer of water, water retention 3 to 5 days after the return to normal management.
Fourth, weed stem and leaf stage supplement
1. Fields dominated by valerian: In the 2~3 leaf stage of valerian, use 60% to 80 ml of 25% penoxsulam oil suspension (rice) per acre, and spray 30-40 kg of water. Drain the field water before application, rehydrate and retain water for 3 to 5 days after the drug. 25% penoxsulam oil suspension has good effect on old psyllium, but is sensitive to soybean, avoiding the drift of the liquid when applying.
2, the field dominated by thousands of gold: in the 2 to 3 leaf stage of the thousand gold, use 10% of cyhalofop-butyl emulsifiable concentrate (1000 gold) per acre, spray 30-40 on water. Drain the field water before application, rehydrate and retain water for 3 to 5 days after the drug.
3. Fields with grasses, weeds and other grass weeds: in the period of 2~3 leaves of Qianjin and Valerian, 10% oxazolamide EC (muqiu good) 100-120 ml per mu , or 60 g / liter of pentafluoro·Cyanofluoride (rice hi) dispersible oil suspension agent 100 ~ 133 ml, 30-40 kg of water on the stem and leaf spray. Drain the field water before application, rehydrate and retain water for 3 to 5 days after the drug.
4. Fields dominated by sedge and broadleaf weeds: 30 days after sowing, 20% of pyrazosulfuron-methyl WP can be used per acre, sprayed with 30-40 kg of water or with toxic soil. When applying the medicine, the sheet should be moist or have a thin layer of water. After application, the water should be kept for more than 5 days. If the sedge and broadleaf grass are older, use 48% of Bendasone water 100ml and 20% 2% 4 chlorohydrate 100ml per acre to spray 30~40kg of weed stems and leaves. Drain the field water before application, rehydrate and retain water for 3 to 5 days after the drug. The dosage should be strictly controlled to prevent the occurrence of phytotoxicity.
Five, matters needing attention
1. Pay attention to the flatness of the field, especially the field where the straw is returned to the field. It must be leveled in place, and the mud should be small to prevent the unsoiled high-stalk straw from destroying the film to affect the weeding effect.
2, the rational choice of herbicides, do not arbitrarily increase or decrease the amount, so as not to affect the effect or produce phytotoxicity. At the same time, pay attention to the field drainage and the chemical mist affect the surrounding crops to avoid phytotoxicity.
3. If the rain occurs, clean the ditch system in time, open the gap, and prevent the water from flooding the rice heart and causing phytotoxicity. On the day of the application or the second day of heavy rain, the amount should be reduced and the dosage should be 50% of the original usage.
4. For the field where the weeding effect is poor in the early stage and the amount of weeds is large, it is necessary to select the herbicide according to the different weed species. If the grass is older, the dosage may be increased as appropriate.
5. For the field where weeds are serious or weedy rice occurs last year, the agricultural control measures before planting should be strengthened. For example, after harvesting summer crops, timely irrigation and cultivating with a medium-sized tractor, smashing and flooding the summer matures, and inducing the early emergence of weedy rice seeds, and re-cultivating after 15 days of water retention.
First, the live broadcast rice field
1. Before seeding or after sowing
Use 26% oxaloin emulsifiable concentrate 100-120 ml per acre. After the end of the whole field, the muddy water is not precipitated, and the water is kept for 3 to 5 days after application. sowing.
Or within 1 to 3 days after sowing, use 40% bensulfuron-propionamide wettable powder 60-80 g per acre, or 30% bensulfuron-propionamide wettable powder 80-100 g, 30-40 for water Kilograms are evenly sprayed on the soil. When applying after sowing, the field should be kept moist, shallow water should be in the field, the field should be kept wet within 3 days after application, and normal field management should be resumed afterwards; the high temperature will be encountered on the same day or the next day after application. More dry, the next day put "horse water". Sowing the grain must first germination, requiring the root to grow a grain of grain, buds and long grain. Do as with the soil preparation, with sowing.
2, after emergence
In the two-leaf stage of rice (about 15 to 20 days after sowing), 53% of bensulfuric acid-sulfonyl WP 60-70 grams per acre is mixed with fine soil or chemical fertilizer, and there is a thin layer of water in the field when applied. Keep the shallow water layer for more than 3 days after application.
Second, transplanting rice fields
1. Before transplanting: After the summer tillage is flattened, the water layer is filled (until the high pier is not exposed). When the weeds are not seeded, the soil is used with 26% oxaloin emulsifiable concentrate 100-120 ml, and the muddy water is turbid.甩 全 全 全 , , , , , , 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全 全80 grams, 1 day after spraying 30-40 kg of water.
2. After transplanting: 5 to 7 days after the machine is inserted, use 53% bensulfuric acid/benzophene wettable powder agent (tossing star) 60-70 grams per acre to mix fine soil or chemical fertilizer. There is a thin layer of water in the field, and normal management is resumed after 3 to 5 days of water retention.
Third, mechanical strip (hole) broadcast
It is recommended to adopt a "two seals and one kill" prevention strategy.
"One": 4 to 5 days after sowing, using 40% bensulfuron-propionamide wettable powder 60-80 grams per acre, or 30% bensulfame-propionamide wettable powder 80-100 grams, 30-40 kg of water sprayed the soil evenly. When applying the medicine, the field is moist, does not accumulate water, and there is shallow water in the field. The plate should be kept moist for 3 days after application, and the water shortage should be done. Rice must be germinated and then sown.
"One kill": If the first blocking effect is not satisfactory, there are more weeds in the field. In the 2~3 leaf stage of valerian or Qianjin, 60g/L of pentafluoro·Cyanofluoride (rice) can be used per mu. Disperse the oil suspension agent 100-130 ml, spray 30-40 kg of water on the stems and leaves. Drain the field water before application, rehydrate and retain water for 3 to 5 days after the drug.
"Two seals": 3 to 5 days after the treatment of stems and leaves, after the establishment of the water layer in the paddy field, use 40% bensulfuron-propionamide wettable powder 60-80 grams per acre, or 30% bensulfame-propionamide Wet powder 80 ~ 100 grams, mixed with fine soil or chemical fertilizer application, before the application of the field should have a thin layer of water, water retention 3 to 5 days after the return to normal management.
Fourth, weed stem and leaf stage supplement
1. Fields dominated by valerian: In the 2~3 leaf stage of valerian, use 60% to 80 ml of 25% penoxsulam oil suspension (rice) per acre, and spray 30-40 kg of water. Drain the field water before application, rehydrate and retain water for 3 to 5 days after the drug. 25% penoxsulam oil suspension has good effect on old psyllium, but is sensitive to soybean, avoiding the drift of the liquid when applying.
2, the field dominated by thousands of gold: in the 2 to 3 leaf stage of the thousand gold, use 10% of cyhalofop-butyl emulsifiable concentrate (1000 gold) per acre, spray 30-40 on water. Drain the field water before application, rehydrate and retain water for 3 to 5 days after the drug.
3. Fields with grasses, weeds and other grass weeds: in the period of 2~3 leaves of Qianjin and Valerian, 10% oxazolamide EC (muqiu good) 100-120 ml per mu , or 60 g / liter of pentafluoro·Cyanofluoride (rice hi) dispersible oil suspension agent 100 ~ 133 ml, 30-40 kg of water on the stem and leaf spray. Drain the field water before application, rehydrate and retain water for 3 to 5 days after the drug.
4. Fields dominated by sedge and broadleaf weeds: 30 days after sowing, 20% of pyrazosulfuron-methyl WP can be used per acre, sprayed with 30-40 kg of water or with toxic soil. When applying the medicine, the sheet should be moist or have a thin layer of water. After application, the water should be kept for more than 5 days. If the sedge and broadleaf grass are older, use 48% of Bendasone water 100ml and 20% 2% 4 chlorohydrate 100ml per acre to spray 30~40kg of weed stems and leaves. Drain the field water before application, rehydrate and retain water for 3 to 5 days after the drug. The dosage should be strictly controlled to prevent the occurrence of phytotoxicity.
Five, matters needing attention
1. Pay attention to the flatness of the field, especially the field where the straw is returned to the field. It must be leveled in place, and the mud should be small to prevent the unsoiled high-stalk straw from destroying the film to affect the weeding effect.
2, the rational choice of herbicides, do not arbitrarily increase or decrease the amount, so as not to affect the effect or produce phytotoxicity. At the same time, pay attention to the field drainage and the chemical mist affect the surrounding crops to avoid phytotoxicity.
3. If the rain occurs, clean the ditch system in time, open the gap, and prevent the water from flooding the rice heart and causing phytotoxicity. On the day of the application or the second day of heavy rain, the amount should be reduced and the dosage should be 50% of the original usage.
4. For the field where the weeding effect is poor in the early stage and the amount of weeds is large, it is necessary to select the herbicide according to the different weed species. If the grass is older, the dosage may be increased as appropriate.
5. For the field where weeds are serious or weedy rice occurs last year, the agricultural control measures before planting should be strengthened. For example, after harvesting summer crops, timely irrigation and cultivating with a medium-sized tractor, smashing and flooding the summer matures, and inducing the early emergence of weedy rice seeds, and re-cultivating after 15 days of water retention.
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