Detailed Explanation of the Latest Selection Methods for Cornfield Herbicides
The main weeds in cornfields include: crabgrass, green foxtail, yellow foxtail, chloris, lovegrass, goosegrass, barnyardgrass, lambsquarters, small lambsquarters, glaucous goosefoot, prickly goosefoot, kochia, Russian thistle, emarginate amaranth, spiny amaranth, redroot pigweed, blood amaranth, edible amaranth, grain amaranth, green amaranth, axillary amaranth, feather cockscomb, purslane, copperleaf, velvetleaf, wild watermelon seedling, black nightshade and other weeds. Perennial weeds include bindweed, reed, purple nutsedge and others.
After Sowing and Before Emergence
1. For plots with no weeds in the field, closed treatment can be adopted. Commonly used agents: 40% propisochlor · atrazine 250-300 g/mu, 40% acetochlor · atrazine 200-250 g/mu, 40% butachlor · atrazine 200-250 g/mu, 52% propisochlor · atrazine 200-250 g/mu, 60% propisochlor · atrazine 180-230 g/mu, 40% acetochlor · metolachlor · atrazine 200-250 g/mu.
2. After wheat harvest, for fields with more annual weeds, adopt the mixed-use technique, implementing “one closed treatment and one kill”: 40% propisochlor · atrazine 200-250 g + 20% paraquat 150-200 g/mu, 52% propisochlor · atrazine 150-200 g + 20% paraquat 150-200 g/mu.
3. After wheat harvest, for fields with more perennial weeds, adopt the mixed-use technique, implementing “one closed treatment and one kill”: 40% propisochlor · atrazine 200-250 g + 41% glyphosate isopropylamine salt 250-300 g/mu, 52% propisochlor · atrazine 150-200 g + 41% glyphosate isopropylamine salt 250-300 g/mu.
Corn Growth Period
1. From the 1-3 leaf stage of corn before weeds emerge to the 1-2 leaf stage of weeds, commonly used agents: 40% Yufeng (propisochlor · atrazine) 250-300 mL/mu, 40% Yuduoshou (propisochlor · atrazine) 250-300 mL/mu, 52% Xiyangyang (propisochlor · atrazine) 200-250 mL/mu, 60% Yujia (propisochlor · atrazine) 180-230 mL/mu.
2. The 3-5 leaf stage of corn is an important period for weed control in cornfields. If weeds are not controlled in time, it will directly affect the growth and yield of corn. At the 3-5 leaf stage of corn, when grass weeds are at 2-5 leaves and broadleaf weeds are 3-5 cm tall. Commonly used agents: 4% nicosulfuron suspension concentrate 100-120 mL/mu, 40% Jinyufeng (nicosulfuron) suspension concentrate 100-120 mL/mu, 53% Yutian (nicosulfuron · atrazine) 90-105 g/mu.
3. At the 3-4 leaf stage of corn, for fields with more purple nutsedge. Commonly used agents: 40% Xishiduo (nicosulfuron · atrazine) 80-100 mL + 56% MCPA-sodium 50-60 g/mu, 4% nicosulfuron 100 mL/mu + 56% MCPA-sodium 50-60 g/mu, 56% MCPA-sodium 60-80 g/mu, 48% bentazone 150-200 mL/mu, 4% nicosulfuron 120-150 mL/mu.
4. At the 5-6 leaf stage of corn, for plots with more weeds, you can choose 40% Xishiduo (nicosulfuron · atrazine) 120-150 mL/mu, 40% Jinyufeng (nicosulfuron) 120-150 mL/mu, 40% Yuanfen (sulfentrazone · atrazine) 250-300 mL/mu, 40% Xishiduo (nicosulfuron · atrazine) 80-100 mL + 56% MCPA-sodium 50-60 g/mu, 40% Yuanfen (sulfentrazone · atrazine) 100-150 mL + 40% Xishiduo 80-100 mL/mu.
5. At the 5-7 leaf stage of corn, for plots with more weeds such as purple nutsedge, field bindweed, small thistle, goosefoot and others, you can apply 56% MCPA-sodium soluble powder 80-100 g/mu, 48% bentazone 200-250 mL/mu, 40% Xishiduo (nicosulfuron · atrazine) 80-100 mL + 56% MCPA-sodium 50-60 g/mu.
6. After the 8-10 leaf stage of corn (plant height 80 cm), for plots with more weeds, conduct directed inter-row spraying of 20% paraquat aqueous solution 150-200 mL/mu. If the field weeds are sparse, a closed herbicide can be added for use together, such as 40% propisochlor · atrazine 150-200 mL + 20% paraquat 200 mL/mu.