There are many kinds of weeds in summer sowing, and the dominant grass populations are goosegrass, valerian, foxtail, crabgrass, big teff, wildflower, hedgehog, purslane, Xiaoli, big sunflower, iron leeks, and flowers. There are more than 10 kinds of wild tube numb, cocklebur, and small cockroaches. The peak period of these weeds is in the middle and late June, and the growth period is in July. The summer sowing crop is in the seedling stage, the root system is small, the growth is weak, and the weeds have a high density in this period, and the growth is strong. In addition, there are more rainy days in this stage, so the weeds tend to cover the crop seedlings and form grass shortages. Affecting the growth and development of crop seedlings, the yield reduction is generally 20% to 30%, and some plots with serious grass shortages and even particles are not harvested.
There are many varieties of summer crops, and the resistance of different crops to herbicides is also very different. If used improperly, phytotoxicity often occurs. Therefore, it is necessary to select different herbicides for different crops, and apply according to the prescribed application amount and the best application method, in order to achieve the desired herbicidal effect. The chemical control techniques for several major summer crop crop weeds are described below. }
The following formulas can be used for weeding and weeding before and after sowing: (1) 72% Duer emulsion 100 g per acre plus 50 kg of water alone, effective control period can reach more than 45 days; (2) 72% The emulsion is 50g per mu and 25% diuron WP 100g is mixed with 40~50kg spray, the effective control period is more than 60 days; (3) 48% cable emulsion 250g per acre plus 40kg Spraying alone, the effective control period is more than 30 days; (4) 48% of the cable emulsion is 100 grams per acre and 25% of the diuron WP WP is mixed with 40 kg of water, and the effective control period is 45 days. about.
In some cases, because the farm work is too busy or climatic factors, it is impossible to carry out surface weeding before the sowing, and the stem and leaf spray can be carried out after the crops and weeds are unearthed. After many years of experiments, it is proved that the fine-grass can be the best herbicide for the sesame field to spray the stems and leaves. It has the best application effect in the 3~5 leaf stage of weeds. The dosage per acre is 45-50 ml, 4 after application. ~5 days of weeds showed signs of poisoning such as yellowish heart and browning between the nodes. After 7-8 days of application, the weeds began to die. The drug has more than 95% control effect on grass weeds such as valerian, crabgrass, foxtail, goosegrass, and big teff, and has poor control effect on dicotyledon weeds and sedge weeds, and is safe for sesame. .
Since the resistance of peanuts is better than that of sesame, in addition to the above-mentioned several formulations for chemical weeding in sesame field can be used, 50-150 ml of acetochlor EC can also be used in front of the buds after sowing. The weed control is closed on the surface, and the effective control period is about 45 days.
The test proves that the chemical weeding formulas for sesame and peanut fields mentioned above can be used for soybean, mung bean and cotton fields. After use, not only can we achieve good herbicidal effect, but also have no adverse effects on the growth of soybean, mung bean and cotton plants. . In addition, 45% of the amphibious emulsion can be used to soy and weed the soybeans and mung bean before sowing. The control effect on grass weeds and various dicotyledon weeds can reach over 95%. The grass period is more than 45 days.
There are many types of chemical herbicides suitable for corn fields. According to recent demonstrations, 72% of Duer emulsifiable concentrates and 40% ethyl sulphate emulsion produced by Hebei Xuanhua Pesticide Plant are the most ideal cornfield herbicides. Both of these agents kill weeds by inhibiting and destroying the proteases of weed seedling cells and inhibiting the photosynthesis of weeds. In the pre-emergence of corn, 72% of the emulsifiable concentrate per 100 mu or 40 is used. % E-A mixture of 150 ~ 200 grams, 40 ~ 50 kg of water to carry out surface weed control, a good control effect on a variety of monocotyledonous and dicotyledonous weeds, effective control of the grass period of more than 60 days, a drug can be used Crops are not affected by weeds throughout their growth period and are safe for corn and crops.
Matters needing attention: When the summer sowing crops are closed and weeded before the sowing, the amount of liquid spray must be mastered while strictly controlling the amount of application. When the soil moisture is good, the amount of liquid per mu should not be less than 40 kg; When the soil moisture is poor, the amount of liquid per acre should not be less than 60 kg. Do not tamper in the ground after application, do not cultivate within 45 days after application, so as not to damage the soil layer. For the spraying of stems and leaves during the growth period, the selected agent should be on the road. The amount of liquid sprayed per acre is 20 to 30 kg. When applying the nozzle, the nozzle must be more than 70 cm away from the ground. In addition, the application time must be after 4 pm, it is strictly prohibited to apply the medicine around noon, and pay attention to the wind direction when applying the medicine. Do not let the liquid medicine float into the sensitive crop field to avoid phytotoxicity.
There are many varieties of summer crops, and the resistance of different crops to herbicides is also very different. If used improperly, phytotoxicity often occurs. Therefore, it is necessary to select different herbicides for different crops, and apply according to the prescribed application amount and the best application method, in order to achieve the desired herbicidal effect. The chemical control techniques for several major summer crop crop weeds are described below. }
The following formulas can be used for weeding and weeding before and after sowing: (1) 72% Duer emulsion 100 g per acre plus 50 kg of water alone, effective control period can reach more than 45 days; (2) 72% The emulsion is 50g per mu and 25% diuron WP 100g is mixed with 40~50kg spray, the effective control period is more than 60 days; (3) 48% cable emulsion 250g per acre plus 40kg Spraying alone, the effective control period is more than 30 days; (4) 48% of the cable emulsion is 100 grams per acre and 25% of the diuron WP WP is mixed with 40 kg of water, and the effective control period is 45 days. about.
In some cases, because the farm work is too busy or climatic factors, it is impossible to carry out surface weeding before the sowing, and the stem and leaf spray can be carried out after the crops and weeds are unearthed. After many years of experiments, it is proved that the fine-grass can be the best herbicide for the sesame field to spray the stems and leaves. It has the best application effect in the 3~5 leaf stage of weeds. The dosage per acre is 45-50 ml, 4 after application. ~5 days of weeds showed signs of poisoning such as yellowish heart and browning between the nodes. After 7-8 days of application, the weeds began to die. The drug has more than 95% control effect on grass weeds such as valerian, crabgrass, foxtail, goosegrass, and big teff, and has poor control effect on dicotyledon weeds and sedge weeds, and is safe for sesame. .
Since the resistance of peanuts is better than that of sesame, in addition to the above-mentioned several formulations for chemical weeding in sesame field can be used, 50-150 ml of acetochlor EC can also be used in front of the buds after sowing. The weed control is closed on the surface, and the effective control period is about 45 days.
The test proves that the chemical weeding formulas for sesame and peanut fields mentioned above can be used for soybean, mung bean and cotton fields. After use, not only can we achieve good herbicidal effect, but also have no adverse effects on the growth of soybean, mung bean and cotton plants. . In addition, 45% of the amphibious emulsion can be used to soy and weed the soybeans and mung bean before sowing. The control effect on grass weeds and various dicotyledon weeds can reach over 95%. The grass period is more than 45 days.
There are many types of chemical herbicides suitable for corn fields. According to recent demonstrations, 72% of Duer emulsifiable concentrates and 40% ethyl sulphate emulsion produced by Hebei Xuanhua Pesticide Plant are the most ideal cornfield herbicides. Both of these agents kill weeds by inhibiting and destroying the proteases of weed seedling cells and inhibiting the photosynthesis of weeds. In the pre-emergence of corn, 72% of the emulsifiable concentrate per 100 mu or 40 is used. % E-A mixture of 150 ~ 200 grams, 40 ~ 50 kg of water to carry out surface weed control, a good control effect on a variety of monocotyledonous and dicotyledonous weeds, effective control of the grass period of more than 60 days, a drug can be used Crops are not affected by weeds throughout their growth period and are safe for corn and crops.
Matters needing attention: When the summer sowing crops are closed and weeded before the sowing, the amount of liquid spray must be mastered while strictly controlling the amount of application. When the soil moisture is good, the amount of liquid per mu should not be less than 40 kg; When the soil moisture is poor, the amount of liquid per acre should not be less than 60 kg. Do not tamper in the ground after application, do not cultivate within 45 days after application, so as not to damage the soil layer. For the spraying of stems and leaves during the growth period, the selected agent should be on the road. The amount of liquid sprayed per acre is 20 to 30 kg. When applying the nozzle, the nozzle must be more than 70 cm away from the ground. In addition, the application time must be after 4 pm, it is strictly prohibited to apply the medicine around noon, and pay attention to the wind direction when applying the medicine. Do not let the liquid medicine float into the sensitive crop field to avoid phytotoxicity.
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