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夏秋季节,有些池塘的绿萍由绿逐渐变黄,甚至枯萎死亡.主要原因是水温过低、池水过肥和病虫为害.防治办法:①地下水抽出后,
Summer and autumn, some ponds of green duckweed gradually turn yellow from green, and even wither death.The main reason is the water temperature is too low, the water is too fat and pests.Prevention and treatment methods: ① groundwater extraction,