Application of several herbicides in forestry nursery

Application of several herbicides in forestry nursery

1 the action principle of herbicides

After herbicides are absorbed by plant roots and buds, they act on specific sites, interfere with plant physiological and biochemical metabolic reactions, and lead to plant growth inhibition or death. The effects of herbicides on plants can be divided into primary and secondary effects. Primary action refers to the earliest effect of herbicides on plant physiological and biochemical reactions, that is, the direct effect on target enzymes or proteins at the initial stage of herbicide treatment. The chain reaction caused by primary action further affects other physiological and biochemical metabolism of plants, which is called secondary action.

2 several common herbicides in forestry nursery

2.1 glyphosate

2.1.1 scope of application. Glyphosate is mainly used in nursery areas, roadsides and ditches, and can be used in those with no stems and leaves below the trunk 50cm.

2.1.2 method of use. The best drug is used when weeds bloom, 15cm for annual weeds and 30cm for perennial weeds. When it is used for weeding between rows of crops, the effect is the safest when the plant is higher than the weed. In general, the soil temperature is suitable, and the weeding effect is the best when the field humidity is high. This herbicide is suitable for rainy, sunny afternoon and rainy days. It is not suitable for the use of medicine in drought, no rain and hot sun. Single dose, 70~80mL each time, 15kg each time. The effect is better with Gor, proportion: glyphosate per sprayer, 40ml at a time; Gol 15mL.

2.2 Guoer

2.2.1 scope of application. Guoer has high activity, wide herbicide spectrum, and is safe for people, animals and the environment. After years of experiments, it is confirmed that Guoer is suitable for raising seedlings and weeding of coniferous species such as Pinus tabulaeformis, Pinus sylvestris, spruce, Platycladus orientalis, Larix gmelinii and other coniferous species, and is also effective in raising seedlings and weeding of Hippophae rhamnoides. Weeding objects: horse tang, barnyard grass, dogtail grass, cricket grass, Kentucky bluegrass, purslane, polygonum quinoa, Elymus mandshurica, dandelion, thorn herb, plantain seed, borage bean vegetable, duck metatarsus, bauhinia, Xanthium and all kinds of Artemisia.

2.2.2 method of use. Sowing and seedling emergence, used for the first time before emergence, is the best at the beginning of May, with the dosage of 45~50mL/667m2. The second medication should be at least 50 days away from the first medication, and the specific time should be controlled according to the morning and evening of seedling emergence and the amount of seedlings. The dosage of the medicine is in 40~45mL/667m2.

Transplanting seedlings and remaining bed seedlings, the first drug was used in the middle of April, the dosage of 80mL/667m2. The second dose is 30 days after the first use of the drug, the dosage of 30mL/667m2 each time, combined with Gai Cao Neng, the dosage is 1 500mL/667m2, the effect is better.

Spraying method, in general, the dosage of the above introduction is applicable to three sprayers. Divide the above solution into three parts, use 15kg with water each time, and spray evenly after stirring evenly, the weeding effect is better.

2.3 take puff clean

2.3.1 scope of application. Naopaojing is a post-seedling herbicide, which can be used to control weeds in poplar, willow, larch, Pinus sylvestris, Pinus koraiensis, spruce, fir, seabuckthorn and other nursery. Its control objects are barnyard grass, Madang, Rabdosia angustifolia, dog tooth root, creeping wheatgrass, tendon grass, wild oats and other weeds.

2.3.2 usage. This herbicide belongs to stem and leaf treatment type. As a result, during the treatment period, the weeds had at least 3 or 5 leaves, and the soil was banned, and the effect was not obvious. Dosage, 20% concentration is suitable for 8~10mL/667m2.

The spraying method is the same as that of Guoer, which should be sprayed on the leaves of weeds, not in the soil. In order to ensure the efficacy, the pesticide should be applied when the wind is less than the second grade in sunny days and the temperature is above 20 ℃.

3 measures and suggestions to enhance the use effect of herbicides

3.1 choose suitable herbicides according to actual needs

Generally speaking, each herbicide has a specific herbicide spectrum, which has a strong selectivity and sterilization. Therefore, during the practical application, the choice of herbicides should be determined according to the types of crops and the varieties of weeds. At the same time, consideration should be given to the local farming system. In addition, pay attention to the mixed and alternate use of several herbicides. After several years of continuous use in one place, a herbicide can increase the drug resistance of weeds, resulting in the inefficacy of the herbicide. As a result, the mixed and miscellaneous use of herbicides can achieve the purpose of removing weeds for a long time.

3.2 choose the best period of medication according to the attributes of medication.

When to choose when to use herbicides, we should comprehensively consider the nature of herbicides, weed growth period, crop growth period and so on. There are most kinds of herbicides to choose from, including stem and leaf treatment type, soil treatment type, contact type, sterilization type and so on. Some are suitable for pre-bud and some for stem and leaf stage. Taking the soil treatment type as an example, the soil surface can be sprayed directly to kill budding weeds. For example: Duer, Acetochlor and so on, suitable for use before weeds are unearthed. When the weeds come out, the effect of using them is often not ideal, and even do harm to the trees. Therefore, be sure to use the medicine at the right time.