How to control weeds in summer corn field?

How to control weeds in summer corn field? Please introduce the method of summer corn and weeds growing fast and concentrated. Maize was most seriously harmed by weeds at seedling stage, and tall closed populations could be formed in the middle and later stages of maize, and the occurrence and growth of weeds were inhibited, but had little effect on yield. The control of weeds in corn field should grasp the two key periods of pre-seedling and early post-seedling, and the comprehensive control schemes of weeds in different periods are as follows: first, weeding before seedling after corn sowing. There are no weed plots in the field, closed soil treatment can be used, commonly used chemicals: 42% isopropene atrazine, etc. 250 300 g / mu. You can also choose jade dragon, jade double shovel, choose hoe, 66% hoe and so on. two。 After wheat harvest, there are more weeds in the field, so "one letter and one kill" is carried out: isopropyl atrazine 250kg 300g 4% nicosulfuron 80g 100g or 20% paraquat 150kg 200g / mu; in addition, you can choose to block Fengchi, block peak pole, double-effect peak pole, and so on. It is suggested that ① should select herbicide varieties with sufficient content and formally registered by the state. ② should master the four points of "morning, wet, quantity and good". "early" means that drugs should be used early, and soil treatment agents should be used as early as possible before weeds are unearthed. "Wet" is to ensure the soil moisture before and after medication. "quantity" is the appropriate dosage, the land with high wheat stubble, much wheat straw and wheat ash, and high organic matter content should be increased by 30% to 50%, and the amount of water should be increased when spraying. The "good" is that the spraying technology should be good, the ground preparation should be fine, the amount of water should be sufficient, the spray should be uniform, and there should be no re-spraying or leakage spraying. Second, weeding in the early stage after maize seedlings. Corn 1-leaf 3-leaf stage weeds unearthed to weeds 1-leaf 2-leaf stage, commonly used chemicals: 42% isopropyl atrazine, etc. 250 million 300 g / mu. In addition, there are jade dragon, jade double shovel, selective hoe, 66% hoe up to 18000g / mu and so on. two。 The growth and yield of maize will be directly affected if weeds are not controlled in time at 3-5 leaf stage. When maize is in the stage of 3 to 5 leaves and weeds in the stage of 2 to 5 leaves. Available herbicides: 4% nicosulfuron suspension 80 ml / mu; blockade peak (4% nicosulfuron-azolone-atrazine) 100 ml 120 g; 42% double-effect peak suspension 180 ml / mu; 56% peak Fuzqing (dimethyltetrachloronicotine atrazine) 100 g / mu. 3. The control of malignant weeds occurred more frequently in the 3-leaf and 5-leaf stage of maize: the plot with more aconite in ① field. Commonly used medicament: 56% Fengji Fuzqing (dimethyl tetrachloropyrimidine atrazine) 100g / mu; Fengji (4% nicosulfuron-azolone) 100g / mu; 48% prednisone 150ml / mu; ② aconite, field twisters, purslane, thistle, gray vegetables and other plots. Commonly used medicament: 4% nicosulfuron or nicosulfuron formula 90% 120 ml / mu 56% Shakuoling 60 grams. 4. There are more weeds in the 5-8-leaf stage of maize, so the above chemicals can be selected to avoid the directional spray along the ridge of corn heart leaves. 5. For sweet corn, waxy corn, popcorn and other corn varieties with poor drug resistance: 42% Yulong, Yushuang shovel, selective hoe, etc., can be selected before seedling; 55% of imported Gengjie can be selected in time after the emergence of corn weeds after seedlings. or domestic 40% quick-acting peak (sulfonate atrazine) 180,300ml / mu. It is suggested that it is necessary to grasp the opportunity for the application of ① post-seedling herbicides. Weeds are too large to enhance drug resistance, weeds are too small, there is no certain leaf area to absorb herbicides, and can not achieve the purpose of weeding. The temperature in ② should not be too high. Internal absorption of post-seedling herbicides in high temperature and dry weather, the liquid is evaporated soon after spraying, and the absorption and conduction is slow, which is not conducive to the efficacy. ③ chemical weeding before and after 7 days can not be sprayed with organophosphorus, do not use motor sprayer spray, in the case of high temperature, it is best to avoid corn heart leaves, so as to avoid drug damage. 3. Directional weeding between rows before closing ridges in the fields where chemical herbicides are not ideal in the early growth stage of corn, 20% Fengchi paraquat 150 200 g / mu, or 25% cedar paraquat 100 500 150 g / mu can be sprayed in the direction of water after the 8-leaf stage of corn, the plant height is more than 60 cm and the base of the stem is aged and purple. Tip: use the medicine with a spray shield and do not spray it on the crops. To use clean water dispensing, do not use river water, well water and other impurities containing more water, sufficient light and high temperature noon medication effect is good. Click to get more corn planting techniques click to get more food crop planting techniques