Share the usage and experience of glyphosate

Glyphosate as a herbicide has a large amount of use and good weeding effect, and is deeply welcomed by farmers, but it should still pay attention to a certain degree of technicality when it is used, and it is easy to bring adverse effects to production, which is worthy of everyone's attention. First, why the efficacy of glyphosate herbicide is different. Glyphosate is a kind of organic phosphine internal absorption and transmission type of biodegradable herbicide, also known as Nongda and Zhencaoning. It is widely used in chemical weeding in no-tillage field and directional weeding in forest and orchard. It can kill all kinds of weeds growing on the ground, but it has no effect on weeds that have not been unearthed underground. Glyphosate herbicides have control effects on more than 40 families of weeds, including monocotyledons, dicotyledons, annual and perennial herbaceous weeds and shrubs, algae, ferns and so on. The inconsistent herbicidal effect of glyphosate herbicides reflected by farmers is no more than the following reasons after our investigation and observation: first, the efficacy of different farming methods will be different. The use of glyphosate herbicides is best used for no-tillage sowing. Spraying 1-3 days before sowing, sowing for the season can also be sowed after spraying. The effect of weeding and weed control before sowing is better than that of ploughing because the drug does not come into direct contact with crop seeds and will not affect crop seed germination and seedling growth. No-tillage does not turn the weed seeds in the soil layer to the topsoil layer, so it is difficult for weed seeds to germinate. Once the crop grows and closes, weed seeds and seedlings cannot germinate and grow because they cannot see the sun. Therefore, the weeding effect of glyphosate herbicide on non-cultivated land is better than that of ploughing farmland. Second, when weeds are used in different growth stages, the efficacy will be different. Glyphosate is an internal absorption and transmission herbicide, so it should be used when weeds are growing most vigorously. In terms of time, it is generally from March to October, and in terms of botanical characteristics, it should be the best time to use drugs before flowering. Generally speaking, annual weeds have a height of about 15 cm, perennial weeds have a height of 30 cm, and they are sprayed with 6-8 leaves. It's the most convenient. Do not consider the growth period of weeds, wait for weeds aging and then blindly spray weeds, of course, can not achieve the ideal control effect. In the weeding between crop rows, when there is a certain gap between the height of crop plants and weeds, the effect is better and safe. At this time, when using glyphosate herbicides, the crops have aged lower leaves, low sensitivity to drugs and poor conductivity, so the drugs have little effect on crops. Such as weeding between corn rows, beans and melons on the shelves, weeding between rows can be used in this way. Third, the efficacy will be different with different spraying concentration. According to the survey, when farmers use glyphosate, the concentration of glyphosate is not as strict as other pesticides, and the phenomenon of increasing or reducing the dosage occurs from time to time. The type of weeds must be considered when determining the concentration of the drug. In general, Gramineae weeds are sensitive to glyphosate and can be killed by low dose solution, but the concentration should be increased when controlling broad-leaved weeds; higher concentration is needed for some perennial malignant weeds propagating in rhizomes, weeds have older leaves and higher drug resistance, and the corresponding dosage should also be increased. For example, when controlling orchard weeds, 10% glyphosate 500,700g and water can be used for 30-40kg; when controlling annual broad-leaved weeds, the dosage should be increased to 750g-1000 g; when controlling perennial malignant weeds, the dosage should reach 1250-1500 g. However, overdose will quickly kill the conductive tissue of the plant, which is not conducive to the absorption of the solution and reduce the efficacy, so in order to use the drug economically, we should first kill the tender grass with a lower concentration, and then spray it with the corresponding concentration after about 10 days. Malignant weeds. Second, how to give full play to the herbicidal effect of glyphosate. First of all, the glyphosate solution should be transmitted to the underground rhizome tissue of weeds in large quantities in order to achieve the weeding effect. This requires more weeds to have leaves. Before use, if the weed area is small and the photosynthesis is not strong, the nutrients stored in the roots are transmitted from the bottom up. At this time, the amount of liquid input to the roots is very small, which can not have the effect of killing weeds. In the middle and later stages of weed growth, photosynthesis is strong and photosynthates are transmitted from top to bottom, and the effect is the best at this time. Therefore, the heaviest way to use glyphosate is to choose the best time to use it. For example, using glyphosate to control weeds in corn field is best when there are 2-3 old residual leaves in the lower part of corn seedling 1.5 meters high, and when the grass height has reached 10 centimeters. The second is to pay attention to environmental conditions. In the range of 24-25 degrees, with the increase of temperature, the absorption of glyphosate by weeds doubled, so the effect of high atmospheric temperature was better than that of low air temperature; high air relative humidity could prolong the wetting time of the solution on the plant surface, which was beneficial to the drug transmission; when the soil water content was low, it was not conducive to the metabolism of plants, so the efficacy decreased. Third, with regard to the mixing of glyphosate and other herbicides, some farmers want to make more recommendations. In order to save labor, they randomly add other herbicides when using glyphosate, but the results are not good, because some herbicides can not be mixed with glyphosate, such as dimethyltetrachloride, gram and other quick-acting herbicides can not be mixed with glyphosate, so as to prevent the aboveground parts of weeds from dying prematurely. Lost the internal absorption and conduction function of glyphosate. The killing effect of glyphosate on the rhizome of underground weeds was reduced. But in glyphosate? The control effect can be improved by adding some plant growth regulators and auxiliaries. The fourth is to choose the best method of application. The method of drug application is very important for glyphosate to control weeds, because the higher the concentration in a certain concentration range, the finer the droplets of the sprayer, which is beneficial to the absorption of weeds. In the case of the same concentration, the more the dosage, the better the weeding effect. Adding 0.1% washing powder to glyphosate or adding 30 grams of diesel per mu can enhance the spreadability, permeability and adhesion of the drug and improve the control effect. Pay attention to the safety of glyphosate to crops when glyphosate is used, glyphosate is a destructive herbicide. If it is not used properly, it will bring hidden dangers to crops. Some farmers use glyphosate to weed the ridges of fields, often because of the dispersion of glyphosate, causing drug damage to nearby crops. There are farmers who do not clean the sprayer as required after using it. As a result, when spraying other pesticides, the residual glyphosate will be sprayed on other crops to cause drug damage. If drug damage occurs on rice, the light ones lose green leaves, causing serious growth obstacles, and the serious ones either die early, or do not heading or abnormal panicles, resulting in losses to rice production. Click to get more herbicide application techniques