Because contract farming tends to result in uneven product quality, Chang's most urgent need was to improve cultivation techniques. The Tounan Farmers 'Association imported a small variety of potato from the US and developed its own specialized farming equipment. Spacing the rows evenly, which is essential to producing a medium-sized crop, was the most important of Chang's standardizations.
由於契作品質參差不齊，當務之急就是改善栽培技術，斗南鎮農會引進美國小型馬鈴薯品種、研發專用農機，推動標準作業程序，關鍵之一在於「行株」間距要一樣寬，才能種出大小適中的作物。