Wheat is the main field crop in China, so the wheat field herbicides are also attracting people's attention. So what are the wheat field herbicides? How to choose the wheat field herbicide correctly?

What are the wheat field herbicides?

The weeds in the wheat field can be roughly divided into broadleaf grasses and grasses. For the weeds in the wheat field, the commonly used wheat field herbicides are as follows:

The herbicides in the broad-leaved wheat field are mainly benzosulfuron, bensulfuron-methyl, flufenacetate, thifensulfuron, flufenacetate, oxazolone, acesulfame, disulfofyl Amine, dimethyltetrachloride, two or four drops of butyl, and the like. There is very little in the North China region of Methylsulfuron. It is best not to use it and the residue is large.

The wheat field herbicides for grasses are mainly oxazolamide, acetyl oxalic acid, dimethyl disulfuron, flucarbazone, and the like.

How to choose wheat field herbicide

l. Master the occurrence of weeds in wheat fields and grasp the timing of optimal application: In China, the weed species in wheat fields mainly include sage, leeks, piglets, mother-in-law, lacquer, and Maijiagong. Wang does not stay. , Tian Xuanhua, see Mai Niang and so on. Weeds have two peaks of unearthing, one of which is generally before winter, and l5 to 20 days after sowing of wheat, that is, from the end of October to the middle of November, the second time is March of the following year, that is, the wheat is greening Before the holiday. Therefore, the best weeding period should be selected in the pre-winter seedling stage and the next spring returning stage.

Moreover, chemical weeding in winter, even if the herbicide has a longer residual period in the soil, will not have a major impact on the lower crop. Weeding before winter can effectively avoid the adverse effects caused by the cold spring in the coming year. At this time, the temperature is suitable, and the herbicidal effect of the medicament can be more effectively exerted, and the dosage is small and the cost will be lower.

2. In recent years, the types of weeds in wheat fields have changed. It is necessary to prescribe the right medicine and rationally choose herbicides: For many years, the control of broadleaf weeds in wheat fields in China has mainly benzosulfuron, 2, 4-d, dicamba and other pharmaceutical agents. Long-term use of drugs to change the types of broad-leaved weeds in wheat fields, the use of herbicides is getting larger and larger, and the imitation is getting worse. Recent experiments across the country have shown that the efficacy of trisulfuron-methyl and 2, 4-d single agents on common weeds in wheat fields is not ideal, and Huayang Maishi, which is compounded by both, can not only produce medicines in a single dose. The shortcomings of the damage, but also achieved an ideal control effect on all kinds of wheat weeds.

Wheat field herbicide use technology

(1) Control of broadleaf weeds

For the control of broad-leaved weeds in wheat crops, phenoxyacetic acid herbicides (such as 2,4-butyl butyrate or 2 methyl 4-chloro), benzoic acid herbicides (such as herbicides and their mixtures), nitriles can be used. Herbicide-like (such as bromoxynil or iodobenzonitrile), sulfonylurea herbicides (such as broadleaf or broad-leaf net), heterocyclic herbicides (such as bentazon, etc.). For example, wheat fields dominated by carp weeds can be prevented by triazobenzene herbicides (such as Xicaojing). For broad-leaved weeds and monocotyledonous weedy crop fields, substituted urea herbicides (such as chloromeron, isoproturon, and ligulon) can be used; in wheat crops, wild oats can be used. The herbicides such as oatmeal, grass, wild swallow or oats are used alone. For example, when the wheat crops are dominated by wild oats and broadleaf weeds, the wild swallows can be mixed with phenoxyacetic acid herbicides. Such as 2,4-butyl butyl ester, etc.; such as wheatgrass, foxtail and broadleaf weeds in the wheat field, sometimes can be controlled with Hetian net. Any herbicide that cannot be mixed should be used alone. The interval between the two agents should be more than 6 days to avoid phytotoxicity or reduce the control effect.

12,4-Dr. herbicide

This type of herbicide is currently the most widely used herbicide for controlling broadleaf weeds in wheat crop fields. 2,4-Dr. herbicides should control the broad-leaved weeds in wheat fields and should be applied before the 4-leaf stage of wheat crops for crop safety. For example, after the 4th leaf stage to the flowering stage, in addition to phytotoxicity to wheat crops, the liquid droplets of the liquid will also harm sensitive crops that have emerged adjacent to the seedlings. Wheat crops are prohibited from being used when heading or spreading flowers.

2 grassroots

It can control a variety of annual and perennial broad-leaved weeds, such as the anti-branched scorpion, scorpion, stalk, scorpion, scorpion, stalk, stalk, stalk, stalk, stalk, stalk, stalk Flowers, small convolvulus, questioning, chicory, sorrel, lone, cabbage, amaranth, sauerkraut, piglet, sorghum, nightshade, etc.

This agent is forbidden to be used after the beginning of the jointing of wheat crops, otherwise it will cause phytotoxicity and reduce production. When the climate is abnormal or the pests and diseases are heavy, the herbicide should not be used; it should not be used in high winds. Bean crops, cotton, fruit trees, grapes, potatoes, sunflowers, tobacco and tomatoes are sensitive to herbicides. When spraying the herbaceous enemy, take care to avoid the spray of the liquid droplets touching the sensitive crops nearby. The wheat field alone has a narrow spectrum of herbicides, and the safety is poor. The cost is slightly higher. Generally, 48% of water is used per acre, 20 to 33 ml, and the stem and leaf are sprayed.

3 broadleaf and broadleaf net

Suitable for controlling broad-leaved weeds in wheat, barley and oat fields, such as anti-branched stalks, wild mustard, sage, scorpion, scoparia, scorpion, pork scorpion, sorghum, scented chamomile and sauerkraut; Leaves scattered control of purslane, mother-in-law, wild stalk, hog, spring scorpion, scorpion flower, broad-leaf net control of glutinous rice, Maijiagong, green leaf zealand, baocai grass, thorn lettuce and porcini Wait.

(2) Control of mixed weeds of broadleaf weeds and grasses

If the broadleaf weeds and the monocotyledonous weeds are mixed in the wheat crop field, the following herbicides can be used to prevent good results.

1 chlorsulfuron; the agent is an ultra-efficient systemic selective pre-emergence and post-emergence herbicide with a long residual period and is safe for wheat under the recommended dosage. It can prevent mites, mites, mites, stalks, stalks, leeks, stalks, pigs, etc., and treat grasses such as maiden, bluegrass, crabgrass, valerian, and foxtail.

2 green merlon; this agent to control the wheat field in the wheat field, see the wheat, bluegrass, sorghum, scorpion, pig scorpion, Xanthium, mother-in-law and so on.

3 isoproturon; 4 Ligulong; 5 rushing grass net; 6 Hetian net.