What are the commonly used soybean pre-emergence herbicides?

Common soybean pre-emergence herbicides include acetochlor, chlorimuron-ethyl, metribuzin, and glyphosate. Generally, acetochlor can be applied before sowing or 3-5 days after sowing before seedling emergence. Chlorimuron-ethyl can be used insoybeanbefore or after seedling emergence, but post-emergence use easily causes phytotoxicity and is generally not recommended. Metribuzin is generally applied 3-5 days after sowing before seedling emergence. Glyphosate can be applied 2-3 days after weeds have fully emerged and before soybean seedling emergence.

What are the commonly used soybean herbicides?

1. Acetochlor (50% acetochlor, 90% acetochlor, 90% Shengnongshi, 90% Henais)

Acetochlor is generally used as a soil treatment and can be applied before sowing or after sowing before seedling emergence. For post-sowing pre-emergence application, it is applied 3-5 days after sowing before seedling emergence. Note that applying it during the soybean soil-cracking stage will cause phytotoxicity, especially when mixed with herbicides for controlling broadleaf weeds; applying during the soybean soil-cracking stage may cause yield reduction. The dosage of soil pre-emergence herbicides should be adjusted according to soil type and organic matter content.

2. Chlorimuron-ethyl (Douchlor, Doucaolong)

Chlorimuron-ethyl can be used before or after soybean seedling emergence, but post-emergence use easily causes phytotoxicity and is generally not recommended. It is usually used for soil treatment after soybean sowing before seedling emergence, applying 60-75 grams of 20% chlorimuron-ethyl per hectare 3-5 days after soybean sowing before seedling emergence. Chlorimuron-ethyl is mainly used in soybean fields to control broadleaf weeds, including cocklebur, giant ragweed, Galeopsis bifida, Elsholtzia, velvetleaf, Polygonum, and Chenopodium, and has inhibitory effects on Cirsium setosum, field horsetail, Polygonum convolvulus, and grass weeds, with poor efficacy against chickweed, Asiatic dayflower, and black nightshade.

3. Metribuzin (Sencor, Jicaozin)

Metribuzin is generally applied as a soil treatment 3-5 days after soybean sowing before seedling emergence. Metribuzin mainly controls various broadleaf weeds such as amaranth, giant ragweed, Chenopodium, Polygonum, chickweed, and cocklebur.

4. Clomazone (Command, Tiandeji, Doucaoling)

Clomazone can be used for pre-emergence weed control before soybean sowing and after sowing before seedling emergence, and can also be used for early post-emergence stem and leaf treatment. It can control annual grass weeds and broadleaf weeds such as barnyardgrass, green foxtail, crabgrass, yellow foxtail, black nightshade, Elsholtzia, Amethystea caerulea, purslane, velvetleaf, wild watermelon seedling, Chenopodium, Polygonum, cocklebur, and giant ragweed, and has certain inhibitory effects on perennial weeds such as Cirsium arvense, Cirsium setosum, sowthistle, and field horsetail.

5. Glyphosate (Roundup, Kelingda, Haolida, Nongminle)

It is suitable for newly reclaimed land and other plots with many perennial weeds to control early spring weeds. After weeds have fully emerged, spray glyphosate 2-3 days before soybean seedling emergence to control perennial weeds that have already emerged. This not only achieves effective weed control, but glyphosate also has strong systemic translocation activity, can kill the underground parts of plants, and thereby reduce the damage in the second year.

The above is a related introduction to what soybean pre-emergence herbicides there are, and we hope it is helpful to everyone.