In the Mayama district of Shimonita-machi, the traditional type of agriculture was a combination of rice, barley, wheat, sweet potatoes, and cocoon production. These crops were grown on the river terraces and gentle slopes. In this type of farm management, Welsh onion growing was only supplementary to cash cropping. This traditional type of farm management have changed into a new and more intensive one due to the decline of sericulture and wheat and barley production, the instability of konjak market price and the acreage allotment of rice production. Farmers have reduced self-support crops, and have introduced commercial crops. Thus a new type of farm management have developed which combines welsh onion with konjak and shiitake production. Welsh onion growing has been developed with demand for year-end gifts and of major restaurants. Additionaly, the yield of welsh onion is 670 thousand yen per 10 are, about three times as high as yield of konjak and cocoon, and about fourteen times as high as yield of rice. Therefore, welsh onion growing is main commercial farming in the compound management of agriculture in the district. Although welsh onion growing is labor intensive farming, farms can decide the size of welsh onion growing according to available labor force in their family, and they can obtain higher returns from small scale of operation. Furthermore, a distribution network of welsh onion has traditionaly been maintained by each farmer, so that welsh onion has been grown by both full-time farmers and part-time farmers. Eventually, welsh onion growing promotes not only the viable agriculture in the Mayama district of Shimonita-machi, but also plays an important role in retaining cash crop farming of part-time farmers.