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Upon inquiry, it was learned that the farmer had applied a large amount of uncomminuted pig manure to the ground. Due to the high temperature in the shed, the secondary decomposation of pig manure occurs, and the air nitrogen content increases, causing burning of seedlings and chlorosis of the bottom leaves of the eggplant plants. It is recommended to strengthen management, pay attention to the temperature of the greenhouse, strengthen ventilation, and the temperature difference between day and night should not be too large. If there is an epidemic disease, carbendazim can be used for control.