How to use herbicide in forest nursery?

How to use herbicide in forest nursery? How do I use it? Controlling weeds in nursery has been a difficult problem in forestry nursery production for a long time. Weeds grow rapidly, not only competing with seedlings for nutrients and water, but also the intermediate host of many diseases and insect pests. At present, the methods to control weeds are artificial pulling, tillage, plastic film mulching and so on, and the most simple and effective method is to use chemical herbicides. First, the use mechanism 1. According to the different drug resistance of seedlings and weeds, herbicides that can control weeds without causing damage to seedlings can be selected, and different seedlings have different responses to the same herbicide. Some seedlings can use their own enzyme system to convert harmful substances in herbicides into non-toxic substances, so as to avoid harm. two。 According to the difference of morphological structure between seedlings and weeds, it mainly shows the difference of root distribution. in general, the root distribution of seedlings is deeper, and the roots of weeds are mostly distributed on the soil surface. Secondly, it is shown in the differences between monocotyledons and dicotyledons and the distribution of aboveground parts, mainly the differences in the height of the aboveground parts of seedlings and weeds, which can selectively apply herbicides to achieve the purpose of weeding and protecting seedlings. 3. According to the different growth time of seedlings and weeds, pre-seedling herbicides or post-seedling herbicides can be selected in time. Second, the method of use. For the nursery that is ready to cut or transplant seedlings, choose pre-seedling herbicides or soil disinfectants, such as potassium permanganate and prometryne, with a dosage of 5080 ml per 667 m 2, which can effectively control the seedlings from being harmed by weeds in a growing season. two。 For large seedlings in the growing period, broad-spectrum herbicides can be used for directional spraying. For example, when there are many dicotyledonous weeds in the nursery, 10.8% high-efficiency herbicide EC + 23.5% fruit EC can be used at 1:1, which can effectively control 1-year-old monocotyledonous and dicotyledonous weeds and has no effect on seedling growth. When 1-year-old Gramineae weeds grow to 3 × 4 leaves, use 10% quizalofop EC 40ml 50ml, or 5% refined grass EC 40ml 50ml, spray 50kg of water every 667m 2. The dosage should be strictly controlled during the application, and the liquid should not be sprayed on the leaves of the seedlings to prevent drug damage. 3. In autumn, the plots where the seedlings have come out of the nursery can be sprayed with sterilized herbicides and soil disinfectants. Such as glyphosate, farmers, and deep turning, in order to achieve the dual purpose of controlling weeds and diseases and insect pests. Matters needing attention 1. Herbicides should be used strictly according to the types of seedlings, different growth periods of seedlings and the types of herbicides, so as to avoid drug damage. two。 The application of herbicides should be carried out in sunny days without wind. The higher the temperature, the faster the effect of herbicides. It is not suitable to apply herbicides when it is windy, foggy and dewy on leaves. 3. The soil moisture is small, which is not conducive to the efficacy of herbicides, so it can be irrigated after application to ensure the efficacy. 4. In the early stage of weed growth, the drug resistance is weak, the drug dosage is small and the effect is good, but in the later stage of weed growth, the drug dosage is large and the effect is poor. Therefore, it is necessary to guard against small, early and preventive weeds. Click to get mass herbicide use technology click to get mass pesticide application technology click to get massive flower and plant planting technology