The surface reason for its formation is the reduction of agricultural and non-agricultural income.

其形成的表层原因为：农业收入和非农收入减少。

youdao

In addition to the total number of farms accounted for 16% of large farms in agriculture-based income, the remaining 84% of small farm income sources are non-agricultural income-based.

除了占农场总数16%的大农场以农业收入为主外，其余84%的中小农场收人来源均以非农业收入为主。

youdao

Agricultural income is also derived from non-food crops such as rubber, fiber plants, tobacco, and oilseeds used in synthetic chemical compounds.

农业收入还来自非粮食作物，如橡胶、纤维植物、烟草以及可用于生产化学合成品的油料作物。

youdao

Moreover, some 70% of farming households derive most of their income from non-agricultural activities.

ECONOMIST: Japan's farmers