How to weed in rice seedling field? What are the herbicides? Is it harmful to seedlings?

The seedling field is also called the mother field, the bottom field, the foot field and the pond. It is a field for cultivating rice seedlings. So how to weed in rice seedling field? What are the herbicides? Is it harmful to seedlings?

How to weed in rice seedling field?

1. Chemical weeding in seedling field is labor-saving, labor-saving and effective. However, in production, if it is not used properly, it will produce drug damage, and in serious cases, it will destroy the seed and rebreed. Therefore, in addition to the seedling field chemistry, it is necessary to master the following techniques:

2. The methods of raising seedlings are different, the herbicides selected and using methods are different. At present, there are two methods of raising seedlings in production, one is water raising (wet raising), the other is dry raising. Dry cultivation and chemical removal technique: after sowing and covering soil, 42% butachlor was used in every 66.7 rice seedling field. Oxazone 10ml, mixed with water for 4 times, was sprayed on the soil and closed, and then the peritoneum was sprayed. Chemical removal technology of water-raised seedlings: during the chemical removal period, when the seedlings grow to the 2-leaf and 1-heart stage, withdraw from the surface water layer of the field, every 66.7 years of seedling field, with 36% benzyl. 5 grams of dichloride, 4 murals of water and 5 grams of water, spray on the seedling field.

3, precautions: (1) the liquid must be sprayed evenly, not re-sprayed or missed; (2) herbicides in dry seedling fields must not be used in water seedlings fields, otherwise it will cause serious drug damage.

What are the herbicides in rice seedling field?

1. Atrazine

Also known as atrazine, the dosage form is 40% gel suspension, which is a broad-spectrum herbicide commonly used in corn fields. It is used before emergence after corn sowing, that is, atrazine is sprayed immediately after corn sowing, with a dosage of 200,300ml per mu. It should be noted that atrazine has a long effective period in the soil, and it is easy to damage sensitive crops (such as rape, etc.) when the amount of atrazine is too large, so the method of stem and leaf spray is generally used to remove weeds in the 3-5-leaf stage of corn and 2-3-leaf stage of weeds.

2. Acetochlor (50% EC)

It is one of the most productive herbicides in China. It is used before emergence of corn after sowing, the dosage is 150,200ml per mu. The herbicide is safe for soybeans and peanuts, so it is suitable for intercropping between corn and soybeans and peanuts. Acetochlor mainly controls annual Gramineae weeds, but has poor control effect on dicotyledonous weeds.

3. Butachlor dosage form is 50% and 60% EC.

Used before emergence of corn after sowing, the dosage per mu is: 60% butachlor 125-150 ml or 50% butachlor 150-185 ml. Butachlor is safe for soybean and peanut, so it is suitable for intercropping between corn and soybean and peanut.

4. Herbicide water

Atrazine water is a mixture of atrazine and Acetochlor, which is used before emergence of maize after sowing, with a dosage of 200ml / mu. It should be noted that atrazine water can not be used in the fields of intercropping of corn, soybean and peanut, but only in the fields of corn monoculture.

5. Kecaoling

Kecaoling 45% suspension emulsion is a herbicide mixture successfully developed by the Weeds Research Laboratory of the Department of Agronomy, Laiyang Agricultural University, Shandong Province. it is a new, safe and efficient herbicide used to control mixed weed communities in corn fields. After 3 years of field experiments, it is proved that Kecaoling can control all kinds of weeds in summer corn field at one time, the weeding effect is more than 90%, and the effect lasts for 60 days. The best use period is 10-15 days after corn sowing or 10-15 days after corn emergence, and the dosage is 200-250 ml per mu. The agent should shake well before use, and mix evenly after adding the agent to the water in the sprayer, 30kg to 35kg per mu of water. Choose windless weather to prevent the liquid from drifting to sensitive crops such as soybeans, peanuts and cotton.

6. Russo

Its common name is alachlor (43% EC), also known as grass is not green. Rasol is a selective pre-bud herbicide, which can be absorbed by plant buds, so that weeds will be killed without being unearthed at the young bud stage. It is used before emergence after sowing, the dosage is 150ml / mu and 30kg / mu, and the water is 30kg / mu. Rasol is safe for soybean, so it is suitable for chemical weeding in intercropping plots of corn and soybean.

Are herbicides harmful to seedlings in rice seedling field?

1. General rice herbicides (such as bensulfuron-methyl, benzoyl-methachlor, etc.) are safe to use on rice, but if excessive, they will still cause certain drug damage. It is suggested that the pesticide should be applied in accordance with the product regulations, and if excessive drug damage occurs, you can find some better foliar fertilizer to spray to alleviate the drug damage.

2. Methods to solve the harm of herbicide residues to seedlings:

(1) detoxification.

1. When the use of medicine is maximum, the field irrigation water should be drained immediately, irrigated with new water several times, and neutralized acid herbicides such as lime should be applied.

two。 If the herbicide on the plant for a long time, you can use sprinkler irrigation mechanical water leaching to reduce the poison stuck to the leaves.

3. When the local drug damage occurs in the field, rinse and cultivate with water first, then replenish the seedlings, and then increase the application of quick-acting chemical fertilizer.

4. If the field is poisoned seriously, the land should be exposed to the sun, turn deeply after leaching, and then plant after no effect, otherwise it will be irrigated again. Or plant a small amount of sensitive crops and observe for 10-15 days.

(2) strengthen field management. When the drug damage is mild, topping or removing the damaged parts in time, applying quick-acting fertilizer and reasonable irrigation; in serious cases, ploughing the land, replanting or replanting; when cylindrical leaves are found in Gramineae, more tillering fertilizer and organic matter fertilizer can be applied, dilute ammonia water or 1% lime water can also be sprayed, and hormone pesticides can be sprayed.

(3) apply plant growth regulators. 4% gibberellin EC was sprayed to promote crop growth.

(4) apply safety agent. Safety agents, also known as antidotes, can protect crops and detoxify a variety of herbicides.