Farm manyre is spread in fields as a nutrient or organic supplement .Effluents from sewage disposal plants are used in some areas both for irrigation and for the nutrient supplement contained .

• 农用肥料可作为滋养或有机补充肥料洒入田间，从污水处理厂排出的废水在某些地方即可用来灌溉，所含的滋养成份也可作为滋养补充肥料。