How do duckweed control in paddy fields

Q: Shang Yongguang, Jining City, Shandong Province: The rice seedlings of the water bred are in the 3-leaf 1 heart stage. There are many duckweeds in the field, which can cause fertilizers to fail, and which herbicides can be used to control them?

Answer: To prevent duckweed seedlings, you can use pyrazosulfuron, bensulfuron-methyl, merrazopsone, 2A 4 chlorine and other agents. 2 A 4 chlorine should be applied in the 4-leaf stage to the jointing stage.

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