The main weeds in corn field are barnyard grass, dogweed, iron amaranth, celandine, oxalis and small fleabane and other species.1, barnyard grass: belongs to the annual grass weeds, resistant to drought and salinity, adaptable, and generally very difficult to prevent and eliminate.2, dogweed: the plant is tall with supportive roots, and it is a kind of common weed in the dryland crops.3, iron amaranth: the resistance to the agent is increasing, and in Some areas have formed a dominant group, belonging to the annual herbaceous plants.
First, barnyard grass
1, Introduction: barnyard grass belongs to annual grass weeds, with strong adaptability, like moist and warm, drought-resistant saline and alkaline features, generally difficult to prevent, is one of the main weeds that harm crops.
2, how to prevent and control: in the pre-millennium generally available 50% ethachlor for pre-millennium soil closure, usually also need to remove the field side of the weeds in a timely manner, to avoid weed invasion of farmland. After harvesting corn, deep plowing in a timely manner, the weed seeds that have entered the field are buried deep into the soil to reduce the chances of it coming out.
2, dogwood 1, Introduction: dogwood (dogwood) belongs to a kind of annual herbaceous plants, the plant is tall and has a supportive root, mainly grows in the wilderness at an altitude of less than 4,000m, the roadside, is the dryland crop is a common weed. 2, how to control: generally in the corn seedling after 3-5 leaf period, weeds 2-4 leaf period, selection of atrazine, rimsulfuron, nicosulfuron and other agents to prevent and eliminate, the time of application of the drug can be generally before 10:00 a.m., but also in the afternoon 3:00 p.m., the application of medicine, the requirement of sunny weather and no wind. Three, Amaranth 1, Introduction: Amaranth belongs to the annual herbaceous plants, at present, with the enhancement of resistance, Amaranth has formed a dominant weed group in some areas, the harm to the corn is getting bigger and bigger, and has become the first big weed in the fall, following the horse tooth forage. 2, how to control: generally available nitroxsulfuron + nicosulfuron + atrazine to prevent and eliminate resistant amaranth. Four, Cang Er 1, Introduction: Cang Er (Cang Zi) in the north of the main harm to maize, wheat, sunflower, potato and other crops, in the south of the main harm to fruit trees, but also the cotton aphid, boll weevil and other pests of the host, the damage to the crop is relatively large. 2, how to prevent and control: because of the high density of the spread of the seeds of the alewives, it is generally necessary to carry out the prevention and eradication before it flowers and bears seeds, usually can choose to use nicosulfuron, atrazine, nitro-sulfur oxon and other agents. Five, oxalis 1, Introduction: oxalis root system is very developed, rooted deep and drought-resistant, in the artificial pulling out it is easy to pull it out of the root system is still in the soil, and after a period of time will be re-grown, so it is very difficult to prevent and eliminate. 2, how to prevent and control: available hoe to remove its roots, reduce the chances of its re-growth, but also available fumisulfuron + nitroxsulfuron + atrazine ternary compound herbicide for prevention and control. Six, small fleabane 1, Introduction: small fleabane (small fleabane) belongs to the annual herbaceous plants, its root system is developed, the amount of seeds is very large, the reproduction speed is fast, is the main weed in the field, and has become one of the common malignant weeds. 2, how to control: with 40% fumitrazol diclofenac dispersible oil suspension agent 100ml to 30 kg of water uniform spray for control.