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Pre-emergence herbicide weeding mechanism and nature: Most of the weed seeds are 1 to 2 cm away from the soil by the leaching of the liquid. The corn seeds belong to the large seeds about 5 cm from the surface, so that the herbicide can be guaranteed. To weed control, and relatively safe for corn.
For soil moisture requirements, pre-emergence herbicides require harsh soil moisture, too dry, not good for leaching of the liquid, too wet, so semi-wet and semi-dry is best.
For temperature requirements, the temperature is higher than 35 °C. The effect is not good. For example, the best mixture of acetochlor is easy to volatilize. The recommended time for spraying is after 5 pm. At this time, the soil is faster than the heat and can be maximized. Play on the drug.
How can corn herbicide herbicide corn seedling herbicide be used to achieve the best results? First of all, the period of use should not be too late. If the time of administration is late, the weeds already have seeds. The weed resistance is strong. The increased dosage will reduce the safety of corn and affect the effect of dead grass. Therefore, the optimal time for the treatment is: 4 to 5 leaf stage of corn. At this time, the weeds have just come out, and the herbicide has the best herbicidal effect.
The mechanism and method of weeding herbicides after seedlings, taking mainstream nicotinic as an example:
See the application of grass, the best period of application is 4 to 5 leaves of corn, followed by the application of weeds after the emergence of the weeds. The theory is that 80% of the weeds in this period have been exactly 2 to 3 leaf stage, as long as the weeds are ready to be applied.
To ensure soil moisture, the post-emergence herbicide is also related to the temperature and humidity of the soil. The relatively large humidity effect is better for the absorption of the liquid.
The application time is after 5 pm, but it is necessary to ensure that the leaves are dry after the evening.
When mixing other chemicals, it is best not to mix them with pesticides. Many insecticides on the market add hidden components.
The dosage should not be deliberately increased, and the post-emergence herbicide is a selective herbicide, which is easy to produce drug resistance.
There are several reasons for the effect of pre-emergence herbicides on pre-emergence herbicides: 1. The wheat bran is too high, the liquid can not reach the soil layer; 2. The temperature is too high (the best drug is ethylacetone, acetochlor is easy to volatilize 3. The water consumption is too small (requires that the water consumption of one mu of land is above 60 kg, and the actual water consumption per mu is about 30 to 40 kg); 4. The herbicide blocking before the seedling is more stringent.
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