Types and methods of chemical herbicides used in forestry at present
The Southern Forestry Chemical Weeding Research Branch has conducted long-term experiments and popularization of chemical herbicides used in forest land in Jiangxi, Fujian, Zhejiang, Guangxi, Hainan, Yunnan and other provinces, and screened out herbicides suitable for the following forest land vegetation. It has the advantages of good weeding effect, long duration, low toxicity and no damage to soil. We have also worked out the time, concentration and usage method, and will continue to expand its popularization and use.
I. Nursery land
1, Chinese fir and pine nursery.
(1) Use 50 ml of 23.5% Goer EC per mu for one-time use; Or 30 mg of GOL or 100 ml of 50% acetochlor EC, and the two drugs are simultaneously poured into 50 kg of water or poured into human body water before and after, and mixed evenly. After sowing and covering the soil, spray it on the bed surface until the seeds germinate, and take it with you.
(2) After the seedlings are unearthed and grow true leaves, there is grass on the seedbed. At this time, after spraying the above liquid medicine, the seedlings should be washed with clear water at that time; Or mix the above drugs into medicinal soil and apply it to the seedbed, which has good effects on monocotyledonous and dicotyledonous grasses. 12.9% Gaicaoneng EC 40 ml per mu, spraying 40-50 g water, which has good control effect on gramineous weeds.
(3) Before the seedlings were unearthed, Mr. Cao grew up. At this time 10% glyphosate1/50 ~1100 can be sprayed with washing powder with 0.5% water. Gramoxone 1/500 spray. Neither of these two drugs can be sprayed on the seedlings (green parts), so they can't be used after emergence. However, for large seedlings with a height of more than 50 cm, there is no green skin and branches at the lower part of the seedlings, and the nozzle should be covered with directional spray.
2. Broad-leaved tree nursery.
(1) After sowing but before emergence. Use 50 ml of Goer EC per mu, for one-time use. Add 100 ml acetochlor to 30 ml GOR and spray with 50 kg water.
(2) After the seedlings are unearthed and grow real leaves, mix the fruits, acetochlor and other drugs with about 100 kg toxic soil. If spraying is used, spray clean water after spraying to wash the seedlings.
Second, young forest, fruit, tea, mulberry forest, fire line open arm maintenance, chemical weeding before afforestation and soil preparation in barren hills, using different herbicides for different vegetation.
1, eight hairs, imperata rhizome and vegetable fern are the main vegetation.
(1) 10% glyphosate: water = 1: 20, add 0.5% washing powder solution and spray it in the vigorous growth period. Glyphosate cannot be poisoned by indigenous methods.
(2) 10% glyphosate: 10% grass irrigation: water = 25: 1: 500, spraying 0.5% washing powder solution.
(3) Bisphosphine mixture. That is, glyphosate: adjust the ratio of phosphine to water to 2 ~ 3: 3 ~ 2: 500, and add 0.5% washing powder solution for spraying. The above chemicals are applied from June to September. 2. Annual monocotyledonous and dicotyledonous grasses are the main vegetation (1). 10% grass irrigation: water = 1: 200, sprayed in April. (2) 10% glyphosate: water = 1: 50 ~ 100, sprayed with 0.5% washing powder solution. (3) Glyphosate: adjust phosphine: water = 2- 1: 1-2: 500, add washing powder solution and spray. (2) and (3) are sprayed from July to September.
3. The vegetation is mainly awn species.
(1) glyphosate: grass: water = 25: 1: 500, with washing powder, sprayed in May and June. (2) Covering irrigation energy: water = 1: 100, and spraying warm stems and leaves from March to 10.
4. Shrub-dominated vegetation (1)2.4-D butyl ester: water = 1: 80 ~ 90. Shrubs grow for a long time and spray wet stems and leaves. (2) Grass irrigation: water = 1: 100, and warm stems and leaves are sprayed from April to May. (3) Covering irrigation energy: diesel =1:5; Or 2.4-d butyl ester: diesel oil = 1: 5, and in March ~ 165438+ 10, a belt with a width of 10 cm was applied around the stems of shrubs and non-destination trees.
5. Mangosteen (Miscellaneous Bamboo) is the main vegetation, and 25% Lin Caojing (also known as Wilbur and Cyclozinone): water = 1: 9. Apply pesticide in March-June, and April-May is the best. Spray bamboo tips or points into the cut bamboo pile, or spray soil with 10 ml liquid medicine at each point. In addition to curing eight hairs, shrubs and awn dustpans, this concentration can be used to spray leaves and soil. When soil is sprayed, it is away from the target tree root 1.5 meters, and it is easy to cause phytotoxicity when it is close. When spraying the above chemicals, they should not be sprayed on the stems and leaves of the target trees.
Third, weeding in the courtyard, roadside and lawn
1. The yard and roadside are overgrown with weeds, and there are many kinds of grass with different heights. They are annual and perennial, and monocotyledonous and dicotyledonous weeds are mixed together and need to be removed together. (1) 10% glyphosate: water = 1: 50- 100, add 0.5% washing powder solution, and spray it from May to August. (2) 10% grass irrigation: water = 1: 200, sprayed in April-May. (3) Gramoxone: water = 1: 500, sprayed from April to August. Or mixing the above three drugs and spraying.
2. Weed lawns, nurseries, young forests and courtyards by daubing. In order to protect saplings and flowers from herbicides, the patented product "Chemical Liquid Applicator" of Shunchang Forestry Committee of Fujian Province was applied, or cotton balls and cotton sticks were made of absorbent cotton, and handles were installed to wrap cotton with gauze or plastic sheets. Wipe the leaves and stems of weeds with the following medicine or drip the tips of weeds. (1) Glyphosate, Caoguanjing and Gramoxone are mixed with the liquid medicine according to the above ratio, and applied or dropped on the top of weeds in time. (2) Except for annual broadleaf grass and sedge, use 48% broadleaf dew agent: water = 1: 300 or so, and smear or drop off weed tips at 1 ~ 4 leaf stage. (3) Except gramineous weeds, apply 10% Herbenqing EC: water = 1: 300 or so, and drip the tips of sporadic weeds.