A trial project cultivating temperate-zone fruits in the area failed as the climate was not suitable. Fortunately, the King of Thailand had gotten wind of the successful project at Lishan and so approached the Chinese ambassador, Shen Chang-huan, for help.
當時泰王蒲美蓬聽說我國有個農藝專家，在山區種植同類果樹極為成功，就請求我國派宋慶雲前去協助。宋慶雲接到這個使命後，即前往泰北，發現日、韓果苗栽種的地方，氣候並不適宜種溫帶果樹。