Detailed Explanation of Key Points of Chemical Weed Control in Rice Seedbeds

Many rice seedbeds have a wide variety of weeds, high density, and severe damage, which has become one of the main obstacles to cultivating strong seedlings and achieving a bountiful autumn grain harvest. The main techniques for doing a good job of weed control in seedbeds are:
I. For dry-raised seedbeds, one of the following 3 formulations should be used: 1. 150 milliliters of 36% Shui Han Ling emulsifiable concentrate per mu; 2. 75 to 100 milliliters of 60% butachlor emulsifiable concentrate per mu; 3. 30 to 40 grams of 30% Yangtian Yicijing or Yangcaojing wettable powder per mu. Formulations 1 and 2 should be applied after the rice seedbed is covered with soil and before film mulching, uniformly sprayed with 40 to 50 kilograms of water; Formulation 3 should be applied from the two-leaf-one-heart stage to the four-leaf stage of the seedlings (no pesticide may be applied before the two-leaf stage), uniformly sprayed with 30 to 40 kilograms of water. In addition, underground pests such as mole crickets and earthworms are more serious in dry-raised seedbeds. 2.5 kilograms of 5% phorate or 2 kilograms of 3% carbofuran granules per mu can be mixed with 30 to 40 kilograms of fine soil and broadcast in the seedbed before sowing, which can effectively control underground pests.
II. For water-raised seedbeds, one of the following 4 formulations should be used. 1. 30 to 40 grams of 50% Kuai Sha Bai, Shen Chu or Sha Bai Wang wettable powder per mu; 2. 30 to 40 grams of 30% Yangtian Yicijing or Yangcaojing wettable powder per mu; 3. 30 to 40 grams of 25% dichloroquinoline · benzyl (Daonongle) suspension concentrate per mu; 4. 60 to 70 milliliters of 60% butachlor emulsifiable concentrate per mu. Formulations 1 to 3 should be uniformly sprayed with 25 to 30 kilograms of water at the 2- to 3-leaf stage of the seedlings; drain the field water before spraying, then reflood 2 to 5 cm 1 to 2 days after spraying, and maintain this for 5 to 7 days. Formulation 4 should be mixed with fine soil and broadcast at the 1- to 1.5-leaf stage of the seedlings.