There are more than 200 species of weeds in wheat fields in China, and more than 20 species are common and seriously hazardous. Among the main weeds in the main wheat growing areas of our province, there are mainly weeds of S. sophia, leeks, scallops, bryophytes, wild sorghum seeds, cyperus communis, trigonatum, scorpion, barnyardgrass, wheatgrass, and field rotation. Flowers, cocklebur, bowls, etc. Affected by the harvesting operations in the north and south across the border, in the past two years, wild grasses such as wild oats, knotted wheat and bromegrass have seriously endangered some areas in our province. Farmer friends should pay enough attention to this.
First, the law of weeds in our province winter wheat, weeds have two emerged peak period, of which the first field weeds sprouting excavation peak is generally before winter, 15 to 20 days after wheat sowing, that is, late October to 11 In the middle of the month, the emergence of weeds accounted for about 95% of the total number of weeds in this period. The second peak of weeds exhumation was in March of the following year, that is, the return of wheat to the beginning of jointing.
Second, the best weeding period can usually be selected in the pre-winter seedling stage and the spring return to the green stage twice weeding operations. Pre-winter weed control can effectively avoid the adverse effects brought about by the spring cold in the coming year. Therefore, when the temperature is appropriate, the herbicide efficacy of the pesticide can be more effectively exerted, and the amount of medication used will be less and the cost will be lower. The spring returning to the green period is mainly due to the fact that the weeds that failed to timely weed control and weeds occur in the early winter are more serious. For wild oats, bromegrass and plots with severe rhythm, weeding can only be used during the pre-winter period, because some pesticides currently on the market are only weeding in the 2 to 4 leaf stage of wheat and before the 3 leaf stage of weeds. best effect.
Third, the chemical weeding program based on previous experience with medication, combined with the occurrence of grassland damage in our province, after subdividing the following weeding program.
1. Fields dominated by grass weeds. Can be controlled with 6.9% Thrips or 3% Shima Oil suspension. Each mu of single-use 6.9% hummer EC 80 to 100 ml of water to 50 to 60 kg of spray or 3% Shima only use 20 to 30 ml of water to spray 40 to 50 kg.
2. Fields dominated by broad-leaved weeds. 75% Baikaojing (produced by Marx, UK) or tribenuron (superstar) can be used. Use 75% Baikuojing 40-50ml water to 30-40kg per acre, or use 10% tribenuron-methyl (superstar) 10g water 30-40kg per acre; use 10% tribenuron-methyl ( Superstars and 75% Baccarat are better mixed and used, and the cost is lower. 75% Baikuojing 25ml + 10% tribenuron-methyl (superstar) 8g per mu can be used to spray 30-40kg of water. 75% Baikuojing has higher safety for grass crops, and has good effects on a variety of 4- to 8-leaf old-leafed broad-leaved grasses. It also has a good variety of intractable weeds such as Cyperus rotundus, Trichosanthes rotundus, etc. Control effect.
3. In fields with severe grass and broad-leaved weed damage, spray 30 to 40 kg of water per acre with a mixture of 6.9% and 50. In the case of a mixture of wild oats and broad-leaved weeds, a single weeding effect of 74 to 80 grams per mu or 120 grams of earthworm can achieve the desired weeding effect.
Fourth, pay attention to matters
1. Use the humming cream to choose after the wheat seedlings, before the wild oats 3 leaves. The use of Baikangjing should pay attention to the sensitive crop fields around the wheat fields and it is forbidden to use them on windy days to prevent the sensitive liquids from being harmed by chemical liquids.
2. The sprayer that used the herbicide should be cleaned in time. The procedure is to rinse with water first, and then wash repeatedly with soap or alkaline water with 2% concentration, and finally rinse with clean water.
3. When spraying herbicides for stems and leaves, pesticide synergists can be added at the same time. For example, Silk Run (GE Silicone) can reduce the spray amount by 30% to 50%, save water, and improve the spraying liquid on the leaves. Adhesion, effectively reduce the loss of pesticides, increase the coverage of the liquid on the foliage, and improve the efficacy of pesticides.
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