The current mainstream herbicides are mainly classified into killed herbicides and selective herbicides.
The herbicides are simply killed regardless of crops, mainly used before sowing. Selective herbicides are produced according to the different degrees of resistance of different types of seedlings. In theory, they can kill impurities. Grass, harmless to seedlings.
Because many farmers have recently hoped to get rid of the basic knowledge of grass-based related easy-to-understand, so today Xiaobian has reorganized the relevant information, bringing you an introduction to the types and characteristics of common herbicides.
Introduction of herbicide types and characteristics
Sulfonylurea
1. High activity, in grams per hectare.
2, the spectrum of killing grass is wide, the weed spectrum of different varieties is different.
3, strong selectivity, high safety for crops, high efficiency for weeds.
4, easy to use, can be absorbed by the roots, stems, leaves of weeds, but also soil treatment.
5, the main target of the plant is acetolactate synthase, does not affect seed germination and emergence, weeds quickly stop growing after receiving the drug, but it takes a long time to die.
6, easy to develop acidic hydrolysis.
7. Safe for mammals. It is easy to decompose and not accumulate in the environment, and some varieties have a long-lasting effect in the soil, which may cause phytotoxicity to the crops.
Dibenzoyl
1. Some of the varieties of this type are soil sealing treatment agents, and some are stem and leaf treatment agents.
2, the blocking treatment agent mainly kills the annual weed shoots, should be applied before the weeds sprout, the broadleaf effect is better than the grass weeds; stem and leaf treatment can prevent a variety of annual and perennial broadleaf weeds, but Perennial broadleaf weeds can only kill the aerial parts. It is not easy to move in the soil and has a moderate effect period.
3, the main contact strike effect on plants.
4, susceptible to phytotoxicity to crops, but only contact phytotoxicity, generally 5 to 10 days can be restored, does not affect production.
Urea
1. Mainly prevent annual weeds, especially for annual broadleaf weeds.
2, the principle is mainly to inhibit the Hill reaction of plant photosynthesis, light intensity can help the drug effect.
3, can not inhibit the seed germination, through the root absorption of the main body, upward conduction, accumulated in the leaves, the application effect before the weed buds.
4. Most of the soil treatment agents are quickly adsorbed by the soil colloid after application and stay in the 0~3cm deep soil layer.
5. The herbicidal effect is closely related to the soil water content. Under normal circumstances, the herbicidal effect is high when the moisture is good.
6, mainly through soil biological degradation, the duration of the effect in the soil for several months to more than one year.
Carbamate
1. Due to different varieties, it can be absorbed by plant roots, coleoptiles and leaves, and has poor control effect on adult weeds.
2. The main action site is the meristem of the plant. The root tip of the victim crop is swollen, dwarfed, and malformed.
3. The main mechanism of action is to inhibit plant cell division, followed by inhibition of photosynthesis and oxidative phosphorylation.
4, soil treatment varieties can be degraded by microorganisms in the soil, the duration of the effect in the soil is shorter, in the warm and humid soil for 3 to 6 weeks.
Thiocarbamate
1, can prevent a variety of annual grass weeds, effective for some broad-leaved weeds.
2. Most varieties are absorbed by weed roots and buds, which are important soil treatment agents.
3. Mainly inhibit the growth of plant meristems. The main symptoms of weeds are: abnormal leaves and growth malformation of grass weeds from coleoptile; in most cases, grass weeds sprout and emerge after application. And died after growing 1~2 true leaves.
4. The selection principle mainly depends on the selectivity of the difference, and the difference between absorption and conduction and its degradation in plants is also an important factor affecting selectivity.
5. Most of the varieties are aromatic liquids or low melting point solids, which are miscible with many organic solvents and have low water solubility.
6, generally more stable. Low toxicity.
Phenoxycarboxylic acid
1. It is usually used for stem and leaf treatment to control annual and perennial broadleaf weeds. When soil treatment is carried out, it also has certain control effect on annual weed weeds and seed breeding perennial weed shoots. But after the unearthing, the effect is not good.
2. Such herbicides can be rapidly absorbed by the roots and stems of broadleaf weeds.
3. When the salt or ester is sprayed on the weeds, the weeds turn them into corresponding acids and become toxic.
4. It belongs to hormone herbicides, which affect almost every physiological process and biological activity of plants.
5, applied to the soil, mainly by soil microbes degradation, in warm and humid climate conditions, their residual period of 1 to 4 weeks, and in cold, dry climate conditions, up to 1 ~ 2 Months.
Benzoic acid
1, usually used in grass crop fields, stem and leaf treatment to control annual and annual broadleaf weeds.
2. Most varieties have herbicidal activity and the activity of plant growth regulators .
3. It can be quickly absorbed by plants after application and accumulated in the active parts of plants.
4, with the role of auxin and interfere with the role of endogenous auxin, they affect the growth of plant roots and shoots, causing deformity.
5. The salt of the benzoic acid herbicide is easily leached in the soil, and the residual effect varies greatly depending on the variety, from 2 to 3 weeks to more than 1 year.
Aryloxyphenoxypropionic acid
1, can be used for broad-leaved crops, can control a variety of grass weeds, is highly selective.
2. This type of herbicide is a post-emergence stem and leaf treatment agent with systemic and local conduction effects.
3. The action site is the meristematic tissue of the plant, which has a strong inhibitory effect on the young meristematic tissue. Generally, the symptoms of phytotoxicity begin to appear in 48 hours, and the heart leaves become purple, yellow, and withered.
4. Inactive in the soil, it is ineffective in the soil. ("Structural types and target types of herbicides", "Causes, types and safe application techniques of herbicides for crops", "Common herbicides"
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