What experience do you have in using glyphosate correctly?

Farmers' friends often encounter some problems when using glyphosate herbicides, among which the iconic phenomena focus on:

First, glyphosate herbicide has a very good weeding effect, but sometimes the efficacy is very different when used;

Second, how to give full play to the actual effect of glyphosate herbicide;

The third is the potential safety hazard of glyphosate herbicide application to crops. As a herbicide, glyphosate is in great demand at present, and its weeding effect is very good, which is warmly welcomed by villagers and friends. However, it is still stipulated to pay attention to certain professionalism when using it, and it is very easy to bring adverse harm to production and manufacturing, which is very worthy of our attention.

1. Why is there a difference in efficacy when glyphosate herbicide is used?

Glyphosate is a kind of organic phosphorus internal absorption and conduction herbicide, also known as Roundup and Zhencaoning. Herbicide has broad spectrum and strong killing effect, and has no residue in soil environment. Widely used in organic chemical weeding in Damaoqi and non-tillage plantations, it can kill all kinds of weeds growing on the road surface, but it is ineffective for weeds that have not been dug up in the underground germination stage.

Glyphosate herbicide is effective for more than 40 kinds of weeds, including monocotyledons, dicotyledons, annual and perennial herbs, shrubs, algae and ferns. Farmers' friends reflected that the actual effect of glyphosate herbicide weeding is inconsistent. After investigation and observation, the reasons are as follows:

First, different breeding methods will have different efficacy. It is best to use glyphosate herbicide instead of ploughing. Apply pesticide 1 0-3 days before planting crops, and plant them after emergency or spraying. Because the drug is not in direct contact with crop seeds, it is not easy to harm the germination of crop seeds and the growth and development of seedlings, so the actual effect of weeding and suppressing weeds is better than that of ploughing.

No-tillage did not transform the weed seeds in the inner soil into the surface soil, so the weed seeds could not germinate. Once the crops are closed, weed seeds and seedlings can't germinate and grow because they can't see the sun. Therefore, the actual effect of glyphosate herbicide to avoid cultivated land will be better than that of ploughing land.

Second, weeds are not used in the same growth period, and their efficacy will be different. Glyphosate is a systemic and conductive herbicide, which should be used when weeds grow and develop most vigorously. Generally speaking, the time is March-10 month, which is the best time to use drugs before flowering according to biological characteristics. Generally speaking, the aspect ratio of annual weeds is 15 cm, and that of perennial weeds is 30 cm, and spraying 6-8 leaves is the most suitable.

Regardless of the pregnancy stage of weeds, it is natural that the idealized control effect can not be achieved by embrittlement of weeds and blindly following the trend to kill weeds. When rows of crops are weeded, the main stems of crops are high and weeds fluctuate to some extent, the actual effect of drug use is good and safe. At this time, using glyphosate herbicide, the crops are already brittle because of their low leaves, so the sensitivity to the drugs is low and the conductivity is weak, so the drugs are not harmful to the plants. For example, this method can be used to weed after the release of corn, beans and melons.

Third, different spraying concentration values will have different efficacy. According to statistics, the concentration of glyphosate used by farmers is not as strict as that of other fertilizers, and it is very random, and the dosage will often increase or decrease. When determining the drug concentration, the species of weeds must be considered. Generally speaking, Cyperaceae weeds are sensitive to glyphosate and can be killed by small doses of chemicals.

However, when chemical control of broad-leaved weeds is carried out, the concentration value should be increased; For some malignant weeds bred by underground stems that have grown for many years, the concentration is definitely higher. Weed leaves are older and have higher drug resistance, so it is necessary to increase the corresponding dosage. Such as chemical control of weeds in plantations, 30-40KG annual Cyperaceae weeds can be used 10% glyphosate 500-700g；; Watery;

When chemical control of annual broad-leaved weeds, the dosage of chemicals should be increased to 750- 1000 g; When the malignant weeds grow by chemical control for many years, the dosage should be 1250- 1500g. However, overdose will kill the transmission mechanism of green plants quickly, which will adversely affect the digestion and absorption of drugs and reduce the efficacy. Therefore, in order to develop the drug economically, young grass should be killed at a lower concentration first, and then malignant weeds should be sprayed with the corresponding concentration value after about 10 days.

Second, how to make full use of the actual weeding effect of glyphosate

Glyphosate must first be transmitted to the underground stem mechanism of weeds, so as to have the practical effect of weeding. This requires weeds to have more leaves. Before application, if the total area of weeds is small and the photosynthesis of plants is weak, the nutrients stored in roots will be transmitted from bottom to top. At this time, the amount of medicine injected into the roots is very small, which can not achieve the actual effect of killing weeds. In the second half of weed growth and development, plant photosynthesis is vigorous,

Photosynthetic products are carried out from top to bottom, and the actual effect of medication is the best. Therefore, the most important thing in the application of glyphosate is to choose the best medication stage. If glyphosate is used to control weeds in corn fields, it is best to spray it when there are 2-3 old leaves below the height of corn seedlings 1.5 meters and the height of grass has reached 10 cm. Secondly, we should pay attention to the standards of the natural environment. In the range of 24-25 DEG C,

With the increase of temperature, the intake of glyphosate by weeds doubles, so the effect of using glyphosate at high temperature is much better than that at low temperature. The humidity of gas and air can prolong the wetting time of drugs on the surface of green plants, which is beneficial to the conduction of drugs. When the soil moisture content is low due to drought, it is not conducive to the basic metabolism of green plants, so it is not conducive to the conduction of drugs in weeds, so the medicinal properties are also reduced.

Thirdly, regarding the mixing of glyphosate with other herbicides, some farmers want to remove a variety of grasses. In order to save people better, they add other herbicides at will when applying glyphosate, but the effect is not very good. Because some herbicides can't be mixed with glyphosate, such as dimethyl carbon tetrachloride, chlorhexidine and other quick-acting herbicides can't be mixed with glyphosate. In case some weeds die prematurely on the ground, the systemic conduction of glyphosate will be lost and the underground weeds will be reduced.

However, adding some green plants NAA and additives to glyphosate can improve the control effect. The fourth is to choose the best spraying method. The application mode is very important for glyphosate chemical control of weeds, because the higher the concentration value in a certain content range, the denser the fine particles in the sprayer, which is beneficial to the digestion and absorption of weeds. Under the same concentration value, the more dosage, the better the actual weeding effect. Adding 0. 1% soap powder to glyphosate or adding 30 g diesel engine to 1 mu can improve the spreadability, water permeability and adhesion of therapeutic drugs and improve the control effect.

Third, pay attention to the safety of glyphosate application in crops.

Glyphosate is a herbicide, which will cause safety risks to food crops if it is not handled properly. Some farmers use glyphosate to weed, usually because of the fall of glyphosate, which causes fertilizer damage to marginal crops. Some farmers didn't clean the sprayer according to the regulations after applying the pesticide. As a result, when spraying other fertilizers, the residual glyphosate was sprayed on other plants, causing fertilizer damage. If there is fertilizer damage on rice, the leaves will turn green, which obviously hinders development. In addition, it will wither ahead of time, or it will not bear ears or abnormal ears, which will damage the production and manufacture of rice.