Application of cornfield herbicide

Chemical weed control in corn field attention to the selection of the appropriate herbicide, informed by the best spraying suitable period, in strict accordance with safe and effective doses of medication and the correct method of application, is to ensure that key chemical weed control efficacy and safety of the corn.

First, before seeding

(1) When there is no weed in the field, it can be closed. Commonly used medicines: 40% isopropyl grass·莠250-300 g/mu; 40% acetaminophen 200-250 g/mu; 40% Ding·莠200-250 g/mu; 52% isopropyl grass·莠200-250 g/mu; 60% isopropyl grass·莠180-230 g/mu; 40% methyl acetate 200-250 g/mu. (2) After the wheat is harvested, the field with more weeds per year in the field adopts mixed technology and implements “one-to-one kill”: 40% isopropyl grass·莠200-250 g+20% paraquat 150-200 g/ Mu; 52% isopropyl grass·莠150-200 g+20% paraquat 150-200 g/mu. (3) After the wheat is harvested, the fields with more perennial weeds in the field are mixed and used to implement “one-to-one kill”: 40% isopropyl grass·莠200-250 g+41% glyphosate isopropylamine salt 250 -300 g/mu; 52% isopropyl grass·莠150-200 g+41% glyphosate isopropylamine salt 250-300 g/mu.

Second, the corn growth period

(1) Before the weeds of corn 1-3 leaf stage are unearthed to the weeds 1-2 leaf stage, commonly used medicinal agents: 40% Yufeng (isopropyl grass·莠) 250-300 ml/mu; 40% jade multi-received Propylene·莠) 250-300 ml/mu; 52% Xiyangyang (isopropyl grass·莠) 200-250 ml/mu; 60% Yujia (isopropyl grass·莠) 180-230 ml/mu.

(2) Corn 3-5 leaf stage is an important period for weed control in corn fields. If weeds are not prevented in time, it will directly affect the growth and yield of corn. Corn 3-5 leaf stage, grass weed 2-5 leaves, broadleaf weeds 3-5 cm high. Commonly used pharmacy: 4% nicosulfuron suspending agent 100-120 ml / mu; 40% Jin Yufeng (nicarsulfuron) suspending agent 100-120 ml / mu; 53% jade sweet (nicotinic acid to Tianjin) 90- 105 g / mu. (3) The 3-4 leaf stage of the corn, the plot with more aconite in the field. Commonly used pharmacy: 40% happy matter (smoke to Tianjin) 80-100 ml +56% sodium dimethyltetrachloride 50-60 g / mu; 4% nicosulfuron 100 ml / acre + 56% sodium dimethyltetrachloride 50-60 g/mu; 56% sodium dimethyltetrachloride 60-80 g/mu; 48% bentazone 150-200 ml/mu; 4% nicosulfuron 120-150 ml/mu.

(4) There are more weeds in the 5-6 leaf stage of corn, you can choose 40% happy things (smoke to Tianjin) 120-150 ml / mu; 40% Jin Yufeng (nicarsulfuron) 120-150 ml / Mu; 40% fate (sulphur grass to Tatsujin) 250-300 ml / mu; 40% happy things (smoke to Tianjin) 80-100 ml +56% sodium dimethyltetrachloride 50-60 g / mu; 40% Fate (sulphuric acid to detoxification) 100-150 ml +40% happy more than 80-100 ml / mu.

(5) Maize 5-7 leaf stage fragrant aconite, field convolvulus, small carp, gray cabbage and other weeds with more plots, can be applied 56% sodium dimethyltetrachloride sodium soluble powder 80-100 g / mu; 48 % oxalopine 200-250 ml / mu; 40% happy matter (smoke to Tianjin) 80-100 ml +56% sodium dimethyltetrachloride 50-60 g / mu. (6) After corn 8-10 leaves (plant height 80 cm), there are more weeds in the ground, and spray 20% paraquat water agent 150-200 ml/mu. If the field weeds are sparse, use a combined herbicide, such as 40% isopropyl grass·莠150-200 ml+20% paraquat 200 ml/mu.

Where a single herbicide is used, care should be taken to calculate the dosage based on the safe and effective dose of the herbicide and the actual area of ​​the corn field. At the same time, if two or more herbicides are mixed, the herbicidal spectrum must be different, but the applicable crops, period and method of use should be consistent and basically the same; when the wettable powder is mixed with the emulsifiable concentrate, the wettable powder should be dissolved in a small amount. The mother liquor is made in water, and then the emulsifiable concentrate is added; when the liquid is first filled, the semi-spray water is first added, and the second diluted pesticide mother liquor is added, and finally the sufficient water is added, and the mixture is fully shaken and sprayed.