Chemical weeding is an important technical measure in the cultivation of spring flower crops. At present, the main weeds in the wheat fields of our city are the agrarians, netgrass, and broadleaf weeds; the rapeseed fields are broad-leaved after the use of high-efficiency grasses, fine grasses and Other grass weed treatment agents. The occurrence of weeds is relatively prominent, and the dominant population of weeds has evolved into a filth. Moreover, as the city has implemented the cultivation techniques of no-tillage wheat and no-tillage transplanting rapeseed for many years, the winter weeds in the spring flower field are more serious each year, and the weeds such as sorghum and netgrass have a tendency to increase year by year. According to the characteristics of planting and weeds of spring flower crops in our city, combined with the results of herbicide tests in previous years, the following technical opinions were put forward on the chemical weeding work of the 2005 spring flower crops.
I. Chemical weeding in wheat field (1) Weeding before sowing: After rice harvest, 2~3 days before sowing of wheat, use 10% glyphosate 500 ml/mu or 20% paraquat (tornado) water 150 ml/mu Spray 40 kg of water evenly to eliminate the old grass.
(2) Weeding after sowing:
1. Barley chemical weeding: 50% isoprocarb powder is used, 125~150 g/mu, and 50 kg spray is applied to the water at the second leaf stage. When applying the medicine, it is required to use sufficient water, and try to use the medicine when the soil is wet to improve the herbicidal effect.
2. Chemical weeding in small wheat fields: 50 ml of 6.9% Hummer emulsifiable concentrate is used in the 2~3 leaf stage after most germination of weeds, and 50 kg of water per acre is sprayed.
Second, rapeseed field chemical weeding before transplanting old grass: after rice harvest, 2 to 3 days before transplanting rapeseed, with 10% glyphosate 500 ml / acre or 20% paraquat (tornado) water 150 ml / The acre is sprayed evenly with 40 kg of water to eliminate the old grass.
(1) Chemical weeding in transplanting rapeseed field 1. After transplanting live rapeseed in rapeseed, use 30% of the turf (grass. fine quinine) emulsifiable concentrate 90ml with 50 kg of water spray, which can effectively control grasses and broadleaf A large amount of weed growth. Since the ingredients of the drug that play a role in broadleaf are mainly used before the weeds sprout, the time of administration should be sooner rather than later. If it is used too late, the control effect on weeds will be reduced, and the use time should not exceed the latest. Mid-December.
2, the field of grass weeds (see Mai Niang)-based field, can be used alone 5% fine grass grass emulsifiable concentrate 50 ml / acre, or 10.8% efficient grass can be emulsifiable oil 20 ml / acre in weed three ~ Four-leaf period with 50 kg of water spray.
3, the field of broadleaf grass (Traditional) mainly, can be used alone 50% herbicide (Gortex) 30 ml / acre in the three to four leaves of weeds 50 kg spray.
(II) Chemical weeding in live rapeseed field Due to the low labor intensity of production, the yield per unit area has been significantly improved after the cultivation technology has been broken. The planting area in our city has expanded rapidly in recent years. The chemical weeding of live rapeseed, if the application technology is not properly mastered, it is easy to cause phytotoxicity or poor weeding effect. Therefore, in the chemical weeding of live rapeseed field, special attention should be paid to selecting suitable herbicide varieties and corresponding control techniques.
1. To look at the grasses dominated by grasses such as Mai Niang: in the four to six-leaf stage of rapeseed, 45-50 ml of 5% pure grass emulsifiable concentrate per acre, or 10.8% high-efficiency grass emulsifiable concentrate 20 ml. 50 kg spray with water.
2. Fields dominated by broadleaf and other broadleaf grasses; in the four to six-leaf stage of rapeseed, 50% of the grass is removed with 50% of the herbicide (Gault) and 50 kg of water.
3. The field where the weeds and broadleaf grasses are mixed, in the four to six-leaf stage of rapeseed, 30% of the turf (grass. fine quinine) emulsifiable concentrate 90ml and 50 kg of water spray.
Precautions:
1. According to the grass phase of the weeds in the field, choose the herbicide varieties of the counterparts and apply them reasonably.
2. The dosage should be accurate when spraying, the dilution should be uniform, no leakage, and severe re-spraying.
3. Since the efficacy of herbicides is closely related to the soil moisture in the field, if the weather is dry and the soil moisture is low, the water consumption should be increased to ensure the true exertion of the herbicide weeding effect.
From: China Agriculture Network
I. Chemical weeding in wheat field (1) Weeding before sowing: After rice harvest, 2~3 days before sowing of wheat, use 10% glyphosate 500 ml/mu or 20% paraquat (tornado) water 150 ml/mu Spray 40 kg of water evenly to eliminate the old grass.
(2) Weeding after sowing:
1. Barley chemical weeding: 50% isoprocarb powder is used, 125~150 g/mu, and 50 kg spray is applied to the water at the second leaf stage. When applying the medicine, it is required to use sufficient water, and try to use the medicine when the soil is wet to improve the herbicidal effect.
2. Chemical weeding in small wheat fields: 50 ml of 6.9% Hummer emulsifiable concentrate is used in the 2~3 leaf stage after most germination of weeds, and 50 kg of water per acre is sprayed.
Second, rapeseed field chemical weeding before transplanting old grass: after rice harvest, 2 to 3 days before transplanting rapeseed, with 10% glyphosate 500 ml / acre or 20% paraquat (tornado) water 150 ml / The acre is sprayed evenly with 40 kg of water to eliminate the old grass.
(1) Chemical weeding in transplanting rapeseed field 1. After transplanting live rapeseed in rapeseed, use 30% of the turf (grass. fine quinine) emulsifiable concentrate 90ml with 50 kg of water spray, which can effectively control grasses and broadleaf A large amount of weed growth. Since the ingredients of the drug that play a role in broadleaf are mainly used before the weeds sprout, the time of administration should be sooner rather than later. If it is used too late, the control effect on weeds will be reduced, and the use time should not exceed the latest. Mid-December.
2, the field of grass weeds (see Mai Niang)-based field, can be used alone 5% fine grass grass emulsifiable concentrate 50 ml / acre, or 10.8% efficient grass can be emulsifiable oil 20 ml / acre in weed three ~ Four-leaf period with 50 kg of water spray.
3, the field of broadleaf grass (Traditional) mainly, can be used alone 50% herbicide (Gortex) 30 ml / acre in the three to four leaves of weeds 50 kg spray.
(II) Chemical weeding in live rapeseed field Due to the low labor intensity of production, the yield per unit area has been significantly improved after the cultivation technology has been broken. The planting area in our city has expanded rapidly in recent years. The chemical weeding of live rapeseed, if the application technology is not properly mastered, it is easy to cause phytotoxicity or poor weeding effect. Therefore, in the chemical weeding of live rapeseed field, special attention should be paid to selecting suitable herbicide varieties and corresponding control techniques.
1. To look at the grasses dominated by grasses such as Mai Niang: in the four to six-leaf stage of rapeseed, 45-50 ml of 5% pure grass emulsifiable concentrate per acre, or 10.8% high-efficiency grass emulsifiable concentrate 20 ml. 50 kg spray with water.
2. Fields dominated by broadleaf and other broadleaf grasses; in the four to six-leaf stage of rapeseed, 50% of the grass is removed with 50% of the herbicide (Gault) and 50 kg of water.
3. The field where the weeds and broadleaf grasses are mixed, in the four to six-leaf stage of rapeseed, 30% of the turf (grass. fine quinine) emulsifiable concentrate 90ml and 50 kg of water spray.
Precautions:
1. According to the grass phase of the weeds in the field, choose the herbicide varieties of the counterparts and apply them reasonably.
2. The dosage should be accurate when spraying, the dilution should be uniform, no leakage, and severe re-spraying.
3. Since the efficacy of herbicides is closely related to the soil moisture in the field, if the weather is dry and the soil moisture is low, the water consumption should be increased to ensure the true exertion of the herbicide weeding effect.
From: China Agriculture Network
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