Rape field chemical weeding, can significantly improve ergonomics, reduce the labor intensity of manual weeding, but also easy to implement, is currently widely promoted rapeseed simplifies the cost-saving cultivation of suitable techniques. Chemical weeding is the use of chemicals to kill weeds. Tests and demonstrations have shown that the chemical weed control efficiency of rape is above 90%. Compared with manual weed control, the effect is improved by about 20%. Once weeding, weeding is not required for all seasons. Since chemical weeding is not like manual weeding to loosen the soil, the roots of rapeseed are firm, and the lodging rate is about 30% lower than that of manual weeding. It can increase 20-30 kilograms of rapeseed per acre, which is well received by farmers.
At present, the type of weeds that occur in the field must be carefully tackled in the fields of transplanting, direct-seeding, and no-tillage so as to lay a solid foundation for the rape harvest.
First, the soil closed chemical control technology before rapeseed sowing site preparation generally do, after ploughing, soil surface seed death, but the underlying grass seed can still sprout from the soil gap. On the other hand, in our province's rice-based rapeseed field, which is dominated by middle-season rice, amaranth is the main dominant grass seed. Therefore, chemical weeding can be performed using pre-emergence treatment with the selective herbicide napropamide, butachlor. The specific method is: After ploughing, timely robbing for soil preparation, 1-2 days after sowing, when the soil moisture is high, use 60% butachlor EC 100-150 grams per acre, add water 60-70 kilograms. Spray evenly on the surface, or use 43% Alachlor EC 200-250 grams per acre plus 60 kg surface spray. Or use 49% trifluralin per acre 100-150g mixed fine soil before sowing on the ground surface, in addition to control aphids and other monocotyledonous weeds, but also for swine, dip and other dicotyledonous weeds Good effect.
Two years ago, post-emergence stem and leaf control technology for the control of aphid and other grassy weeds after the emergence of chemical control, can use contact killing herbicides to stabilize the kill, get caught net, cover grass energy, grass grass grams, double oysters, etc. . The time of chemical weeding is best in the weed 3-6 leaf stage, and the general spraying concentration is: 15% of the finely stabilized EC, 10% of the weed, and 12.5% ​​of the grass cover can be 50-70 ml per mu. , Add water 50-60 kg spray, control effect of more than 90%, can basically control weed damage. These kinds of agents are more resistant to rain, and it rains after 2 hours of application, which has no effect on efficacy. For rape fields with poor drought and drought, it should be combined with irrigation to maintain a certain degree of soil moisture in order to ensure efficacy.
Third, no-tillage technology in addition to no-till weeds high base, grass age, after sowing more concentrated grass. In response to this situation, the method of elimination is to completely kill the sowing herb and timely sow the sowing grass. In the selection of herbicides, we should use the herbicides for sowing before treatment, and weed herbicides for blocking and sowing. According to the experiment, 10% of the herbicide glyphosate was used for weeding before sowing, and after one month of field investigation, the control effect reached 80%, which greatly reduced the weed base and effectively solved the serious problem of weed damage.
At present, the type of weeds that occur in the field must be carefully tackled in the fields of transplanting, direct-seeding, and no-tillage so as to lay a solid foundation for the rape harvest.
First, the soil closed chemical control technology before rapeseed sowing site preparation generally do, after ploughing, soil surface seed death, but the underlying grass seed can still sprout from the soil gap. On the other hand, in our province's rice-based rapeseed field, which is dominated by middle-season rice, amaranth is the main dominant grass seed. Therefore, chemical weeding can be performed using pre-emergence treatment with the selective herbicide napropamide, butachlor. The specific method is: After ploughing, timely robbing for soil preparation, 1-2 days after sowing, when the soil moisture is high, use 60% butachlor EC 100-150 grams per acre, add water 60-70 kilograms. Spray evenly on the surface, or use 43% Alachlor EC 200-250 grams per acre plus 60 kg surface spray. Or use 49% trifluralin per acre 100-150g mixed fine soil before sowing on the ground surface, in addition to control aphids and other monocotyledonous weeds, but also for swine, dip and other dicotyledonous weeds Good effect.
Two years ago, post-emergence stem and leaf control technology for the control of aphid and other grassy weeds after the emergence of chemical control, can use contact killing herbicides to stabilize the kill, get caught net, cover grass energy, grass grass grams, double oysters, etc. . The time of chemical weeding is best in the weed 3-6 leaf stage, and the general spraying concentration is: 15% of the finely stabilized EC, 10% of the weed, and 12.5% ​​of the grass cover can be 50-70 ml per mu. , Add water 50-60 kg spray, control effect of more than 90%, can basically control weed damage. These kinds of agents are more resistant to rain, and it rains after 2 hours of application, which has no effect on efficacy. For rape fields with poor drought and drought, it should be combined with irrigation to maintain a certain degree of soil moisture in order to ensure efficacy.
Third, no-tillage technology in addition to no-till weeds high base, grass age, after sowing more concentrated grass. In response to this situation, the method of elimination is to completely kill the sowing herb and timely sow the sowing grass. In the selection of herbicides, we should use the herbicides for sowing before treatment, and weed herbicides for blocking and sowing. According to the experiment, 10% of the herbicide glyphosate was used for weeding before sowing, and after one month of field investigation, the control effect reached 80%, which greatly reduced the weed base and effectively solved the serious problem of weed damage.
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