Regardless of whether it is direct seeding or direct-seeded rice, the rice generally does not establish water layer and moist management before the 2nd leaf stage of rice seedlings. After 2 leaf 1 heart period, water layer management should usually be established. On the one hand, shallow water irrigation can promote rice tillering, and on the other hand, it can suppress grass with water to prevent the germination of crabgrass and Qianjin. In uneven fields, the water layer should be properly postponed to avoid drowning.
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