In these cases farmers cannot pass on their agricultural know-how to their children or grandchildren, so no generation change in farming occurs, farmers grow older and at last they give up farming.
世帯の兼業では子や孫に農業ノウハウが受け継がれないので、営農者の世代交代が進まず、営農の主体が高齢化し、最終的に営農放棄となる。