Some elements to be aware of when using chemical weeding

People who have been through the field know that the weed problem is very troublesome in the planting process. Fortunately, there is a chemical weeding method, which is convenient, fast and effective. However, there are several points to be aware of in chemical weeding. You must tell us here.

1. Proper selection of herbicides Chemical herbicides are highly selective pesticides that use plant physiology to select for weeding. Different plants have different sensitivities to the medicinal agents and thus have different effects. The choice of herbicides is mainly based on several major factors such as target weeds to be controlled, weed growth period, planting locations and plant varieties. Other factors affecting herbicide selection include soil type, soil temperature, soil pH, organic matter, soil moisture, whether weeds or plants grow under stress, the use of herbicides, and the retention of herbicides on leaves or soil surfaces. , weed flow and spray volume.

In the same nursery, the use of a single herbicide for the same type of weeds in the same year will have two adverse consequences. One is to induce weeds to resist the herbicide, and the other is to change the weed population and kill the original dominant population. Weeds promote the original weeds to become dominant weeds and increase the difficulty of weed control. Therefore, it is possible to use a method in which the herbicide is mixed, and it should also be recycled. Herbicides used for alternate use should be flexibly selected based on factors such as performance, containment, safety and cost. Generally, herbicides with different herbicidal spectrums or different action mechanisms are used alternately, or soil treatment agents and stem and leaf treatment agents are used alternately.

2. Strictly control the amount of herbicide used must be appropriate, the amount of small affected the herbicidal effect, can not achieve the purpose of weeding; large amount is neither safe nor economical. The amount of herbicide used should be based on the soil and plant sensitivity period. The adsorption capacity of sandy soil is weak and easy to produce leaching. It is recommended to use low limit. The dosage of the sand soil should be reduced by about 1/3. The clay colloid has strong adsorption capacity and many herbicides are adsorbed. It is suitable to use high limit and high temperature and rainy conditions. The dosage should be appropriately reduced; the lower limit of the dose for weeds and the upper limit for weeds. In order to pursue the herbicidal effect, the dosage is increased at random, or the mixed medicine is uneven (spraying method), the water is too small (spraying method), or the local concentration is too large after re-spraying, which is likely to cause plant phytotoxicity. In the preparation of herbicides, it should be prepared according to the recommended dosage and concentration, and should be prepared according to the ratio. Do not use caps or other utensils.

3. Strictly control the use time regardless of the growth period of the plant, regardless of the size of the weeds, the practice of seeing the grass, greatly reducing the herbicidal effect of the herbicide, and some may cause plant poisoning, which should be the most resistant to plants. Used during the period. The different growth stages of weeds are also sensitive to herbicides, and only when the weeds are most sensitive to herbicides can the best control effect be achieved. In general, weeds are most sensitive to soil-treated herbicides at the time of germination, and most sensitive to stem-leaf-treated herbicides at the 2 to 3 leaf stage.

More pesticide knowledge , please pay attention to China Pesticide Network

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