Weed control techniques in winter wheat fields

Time:

2013-04-08


The main weeds that occur in rice wheat rotation wheat fields include hard grass, Kanmai Niang, Poa pratensis, Poa pratensis, wild oats, Chinese cabbage, cattail, pig weed, shepherd's purse, and other monocotyledonous and dicotyledonous weeds.

The main weeds that occur in dry wheat rotation wheat fields include wild oats, pigweed, Zeqi, Soniang Artemisia, mother-in-law, Maijiagong, Dachaochi, Niufangzi, shepherd's purse, and other monocotyledonous and dicotyledonous weeds.

According to the characteristics of weed occurrence in wheat fields, it is recommended to adopt the principles of "one sealing", "two killing", and "three supplementing" for weed prevention and control in wheat fields, namely, sealing before sowing, preventing and controlling during the seedling stage (mid to late November), and supplementing during the turning green period (late February to mid March of the following year).

Prevention and control technology

1、 Prevention and control of wheat weeds in rice wheat rotation:

1. The plowing of wheat fields requires intensive cultivation, covering of wheat seeds, and combined with the prevention and control of broad-leaved weeds. Corresponding measures should be taken during the three prevention and control periods:

1) After wheat sowing and before seedling, ① 25% chlortoluron 300-400g, ② 25% chlortoluron 250-300g+60% butachlor 75-90ml, or ③ 50% isoproturon 140-160g mixed with 60-80kg of water evenly spray per mu (667m2) for sealing treatment (increase water consumption in case of soil drought to ensure the efficacy).

2) Seedling stage (3-4 stages): Use ① 140-160 grams of 50% isoproturon+10-15 grams of chlorpyrifos (32% bensulfuron) or 15-20 grams of broadstar (10% bensulfuron) per mu, or ② Hange, Maicaoxing (50% bensulfuron · isoproturon) 150-180 grams, or ③ Maige (50% bensulfuron · isoproturon) 150-180 grams Or ④ Mizun (69g/L of oxazolin) 80-120ml or Mihexin (20-30g of 15% alkynooxalic acid+15-20g of Kuanxing or 30-40ml of Jinkueda (20% of chlorofluoropyroxyacetic acid), or Mizun 1+1 (15g of Kuanxin+30ML of Jinkueda) or Jieqing 1+1 (15g of Kuanxing+30ML of Jinkueda) and other formulas, mix 30-40kg of water to evenly spray to prevent and remove weeds of Hekueda. Isopropanol can also be used in combination with Maihexing to improve the control effect of grass weeds and reduce the risk of wheat freezing damage caused by Isopropanol during cold waves.

3) Wheat rejuvenation period: for wheat fields with grass and broad weeds, the formula of Maizun 100-150ml or Maihexing 30-40g+Chaowei 10-15g, Kuanxing 15-20g or Jinkuoda 40-60ml can be used per mu, and 30-40kg water can be added to evenly spray to control grass and broad weeds; For wheat fields dominated by gramineous weeds, we can choose Maizun 100-150ml or Maihexing 30-40g, add 30-40kg water to evenly spray to supplement and control gramineous weeds; For wheat fields dominated by broad-leaved weeds, ① Maijing (32% bensulfuron methyl 15g+10% bensulfuron methyl 15g), ② Jinkuai up to 40-60ml, ③ Jiazun 1+1 (Chaowei 15g+Jinkuai 30ML), ④ Jieqing 1+1 (Kuanxing 15g+Jinkuai 30ML) 1-2 bags mixed with 30-40kg water can be used for uniform spray to control broad-leaved weeds.

2. In the wheat field where wheat is intercropped with rice, after harvesting the rice, furrows should be opened and covered with soil. After 7-10 days of seedling training, it is necessary to combine the removal of broad-leaved weeds and take prevention and control measures during the seedling stage and the turning green stage: 1) Seedling stage (3-4 stages): the same as above (seedling stage formula); 2) Wheat Revitalization Period: Same as above (Revitalization Period Formula)

2、 Prevention and Control of Weeds in Dry Wheat Rotation

1. Wild oats and broad-leaved weeds mixed in wheat fields: It is necessary to focus on the key period of prevention and control in the early winter period and supplement prevention during the turning green period. 1) Seedling stage (3-4 stages): Same as above (seedling stage formula); 2) Wheat Revitalization Period: Same as above (Revitalization Period Formula)

2. The mixed wheat field of pig plague, sown Artemisia annua, and shepherd's purse should focus on the key period of prevention and control in the early winter period, and supplement prevention during the turning green period.

1) Early winter of seedlings: from the middle to late November to early December, when weeds are almost complete, ① Maijing 1-2 bags or ② Chaowei 10-15g or Kuanxing 15-20g+Jinkueda 30-40ML ③ Jiazun 1+1, ④ Jieqing 1-2 bags mixed with 30-40kg water can be used for uniform spray, basically controlling weed damage during wheat growth period

2) Revitalization period: for the wheat fields where the suitable period for prevention and control of swine plague has passed and no effective prevention and control has been carried out in the early stage, the pesticide should be applied as soon as possible from late February to early March. ① 1-2 bags of Maijing, or ② 10-15g of Chaowei or 15-20g of Kuanxing+30-50ML of Jinkuai, ③ 2 bags of Jiazun, and ④ 2 bags of Jieqing can be used for spray evenly with 30-40kg of water per mu. Early application can also achieve good weed control effects, but late application is not effective.

3. Pig plague, sow mother Artemisia, and mother-in-law mixed wheat field: According to different situations, the method of applying pesticides during the seedling stage and selecting treatments in stages is adopted.

1) Early winter of seedlings: from mid to late November to early December, when weeds are almost complete, ① Maijing or ② Chaowei 10-15g or Kuanxing 15-20g+Jinkueda 30-40ml per mu can be selected; ③ Jiazun 1+1, ④ Jieqing 1-2 bags of water 30-40kg can be sprayed evenly

2) Green returning period: For the fields with a lot of lacquer, you can supplement as much as 40-60ml/mu of gold during the wheat green returning period. ② Jiazun 2 bags and ③ Jieqing 2 bags are sunny and the temperature is higher than 10 ℃. The weather forecast is that the weather will be better in the next few days. Before the wheat jointing, you can add 30 kg of water to spray evenly.