Chen Ching-shan, chairman of the Hsinhu cooperative farm at Yunlin, who went to Singapore to survey the export market, points out that head lettuce is not suited to hot climates. The US has an extensive growing area and, coordinating with the seasons, can supply Japan with 7,000 metric tons a year.
當時赴新加坡測試外銷市場的雲林新湖合作農場場長陳清山指出，結球萵苣等「美生菜」不適合高溫氣候，美國產區大，在季節性調配下，全年可供應日本 7000 公噸美生菜。