The ruling on using animal dung in agriculture

Question : The farmers in our area use materials made from animal dung to grow crops and fruits. Does this fall under the prohibition of urine and excrement under a fruit-bearing tree?

Answer : No. It is reported from the righteous predecessors that they used manure, meaning fertilizer, for the farmers, made from human excrement. It is for the benefit of the crops, but the question remains: is it permissible to eat the produce that has been watered with this impure substance? The correct view is that it is permissible to eat it, unless the smell of impurity appears in it, in which case it is not eaten. As for if it has undergone a change and the smell does not appear, then it is fine.