What herbicides are used in rice seedling beds? Use them correctly and you won't harm the seedlings

The seedling bed is also called the seedling mother bed, seedling bottom bed, seedling foot bed, or seedling pool. It is the plot of land used to raise rice seedlings. So how do you control weeds in a rice seedling bed? What herbicides are there? Are they harmful to the seedlings?

How do you control weeds in a rice seedling bed?

1. Chemical weed control in seedling beds saves labor and effort and gives good results. However, in production, if the method of use is improper, it will cause herbicide damage, and in severe cases the seed must be destroyed and the seedlings raised again. Therefore, the following application techniques must be mastered for chemical weed control in seedling beds:

2. Different seedling-raising methods require different herbicides and methods of use. At present there are two seedling-raising methods in production: one is water-raised seedlings (moist seedling raising); the other is dry-raised seedlings. Dry-raised chemical control technique: after sowing and covering with soil, for every 66.7 sq m of seedling bed use 10 ml of 42% butachlor.oxadiazon, diluted in 4 kg of water, and spray the soil to seal it, then cover with film after spraying. Water-raised seedling chemical control technique: the timing for chemical control is when the seedlings grow to the 2-leaf 1-heart stage; drain off the water layer from the field surface, and for every 66.7 sq m of seedling bed use 5 g of 36% bensulfuron.dichloroquin, diluted in 4-5 kg of water, and spray the seedling bed.

3. Precautions: (1) The spray solution must be sprayed evenly, and must not be sprayed twice over the same spot or missed; (2) Herbicides for dry seedling beds must never be used on water seedling beds, otherwise it will cause severe herbicide damage.

What herbicides are used in rice seedling beds?

1. Atrazine

Also known as atratone, the formulation is a 40% gel suspension, and it is a broad-spectrum herbicide commonly used in corn fields. It is used after corn sowing and before emergence, that is, spray atrazine immediately after corn sowing, with a dosage of 200-300 ml per mu. Note that atrazine has a long residual life in the soil, and when the application rate is too large it easily harms sensitive subsequent crops (such as rapeseed, etc.), so the method generally used is stem and leaf spraying to control weeds, at the 3-5 leaf stage of corn and the 2-3 leaf stage of weeds.

2. Acetochlor (50% emulsifiable concentrate)

It is one of the herbicides with the largest production volume in our country. It is used after corn sowing and before emergence, with a dosage of 150-200 ml per mu. This herbicide is safe for soybeans and peanuts, so it is suitable for plots where corn is intercropped with soybeans and peanuts. Acetochlor mainly controls annual grass weeds, and its control effect on dicotyledonous weeds is relatively poor.

3. Butachlor formulations are 50% and 60% emulsifiable concentrates,

used after corn sowing and before emergence, with a dosage per mu of: 125-150 ml of 60% butachlor or 150-185 ml of 50% butachlor. Butachlor is safe for soybeans and peanuts, so it is suitable for plots where corn is intercropped with soybeans and peanuts.

4. Acetochlor-atrazine water

Acetochlor-atrazine water is a mixed formulation of atrazine and acetochlor, used after corn sowing and before emergence, with a dosage of 200-300 ml per mu. Note that acetochlor-atrazine water cannot be used on plots where corn is intercropped with soybeans and peanuts, and is only suitable for plots where corn is grown alone.

5. Kecaoling

Kecaoling 45% suspension emulsion is a mixed herbicide successfully developed by the Weed Research Laboratory of the Agronomy Department of Laiyang Agricultural College in Shandong, and is a new, safe and highly effective herbicide used to control mixed weed communities in corn fields. After 3 years of field trials it has been proven that a single application of Kecaoling can control all kinds of weeds in summer corn fields, with a weed control effect of more than 90% and a residual life of 60 days. The best time to use it is after corn sowing and before emergence or 10-15 days after corn emergence, with a dosage of 200-250 ml per mu. Before use the agent must be fully shaken and mixed evenly, and after the agent is added to the sprayer and diluted with water it must also be stirred evenly, with a water volume of 30-35 kg per mu. Choose windless weather for use to prevent the spray solution from drifting onto sensitive crops such as soybeans, peanuts and cotton and causing herbicide damage.

6. Lasso

Its common name is alachlor (43% emulsifiable concentrate), also known as grass-no-green. Lasso is a selective pre-emergence herbicide that can be absorbed by plant buds, killing weeds at the bud stage before they emerge. It is used after corn sowing and before emergence, with a dosage of 150-300 ml per mu, diluted in 30-35 kg of water, and sprayed evenly. Lasso is safe for soybeans, so it is suitable for chemical weed control in plots where corn and soybeans are intercropped.

Are herbicides in rice seedling beds harmful to the seedlings?

1. Although general rice herbicides (such as bensulfuron-methyl, mefenacet, etc.) are said to be safe to use on rice, if used in excess they will still cause a certain amount of herbicide damage. It is recommended to apply the pesticide according to the dosage specified on the product. If herbicide damage occurs from excess use, you can find some good foliar fertilizer to spray, so as to alleviate the herbicide damage.

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

(1) Detoxification.

1. When the dosage is at its maximum, immediately drain the irrigation water from the field, flush and irrigate with fresh water several times, and apply lime, etc., to neutralize acidic herbicides.

2. If there is a lot of herbicide on the plants, sprinkler irrigation machinery can be used to wash with water, reducing the toxic substances stuck on the leaves.

3. When herbicide damage occurs in a local part of the field, first drain water to rinse and plow, then replant seedlings, and then apply quick-acting chemical fertilizer.

4. If the field is severely poisoned, the plot should be exposed to the sun, rinsed and then deep-plowed, and planted only after there is no effect; otherwise flush and irrigate again. Or plant a small amount of sensitive crops and observe for 10-15 days.

(2) Strengthen field management. When the herbicide damage is light, promptly top or remove the damaged parts, apply more quick-acting fertilizer, and irrigate reasonably; when severe, plow the land and replant or change crops; when tubular leaves are found in grass-family plants, apply more tillering fertilizer and organic matter fertilizer, and also spray dilute ammonia water or 1% lime water, and spray hormone pesticides.

(3) Apply plant growth regulators. Spray 4% gibberellin emulsifiable concentrate to promote crop growth.

(4) Apply safeners. Safeners, also called antidotes, can protect crops and can detoxify a variety of herbicides.