Effects of sewage sludge source liquid fertilizer on the growth and soil properties of milk cabbage

The sludge was underwent alkali-thermal hydrolysis to obtain liquid fertilizer. A liquid fertilizer gradient is used to replace nitrogen in urea and use it as fertilizer during the cultivation of milk cabbage. In order to explore the effects of liquid fertilizer on the growth and soil properties of milk cabbage, the non-fertilization group and the urea-only application group were compared.