本研究於2017年4月利用國立屏東科技大學水土保持系戶外教室之坡地芒果園初設長度及寬度為10 m及2 m山邊溝，期間選定山邊溝之溝面坡降分別為：1.5 %、5 %、7 %、9 %、11%及13 %之裸露溝面為試驗區，再於6~8月雨季期間進行土壤沖蝕量觀測。獲致結果:水土保持手冊之山邊溝溝面坡降建議值1.5%為基準，該溝面坡降之土壤沖蝕量，分別對比溝面坡降為5 %、7 %、9 %、11 %及13 %者之土壤沖蝕量，可知後者之土壤沖蝕量依序分別為前者3、5、6、8及9倍，顯示坡地果園山邊溝溝面坡降不宜大於1.5%。

The mainly objective of this study was to realize soil erosion after created preliminarily hillside ditch with various longitudinal section slopes in slopeland orchard. The plot was a slopeland mango orchard, and located at the outdoor classroom of Soil and Water Conservation, National Pingtung University of Science and Technology. There were several slopes of longitudinal section on hillside ditch included as: 1.5 % , 5 % , 7 % , 9 % , 11 % and 13 %. The soil erosion measurement on the bare ground surface of hillside ditch with 10 m in length and 2 m in width ,was conducted from June to August , 2017. The results obtained are as follows: The recommended value of the slope of the hill ditch slope of the Soil and Water Conservation Manual is 1.5%. Comparing the soil erosion of the slopes of 5 %, 7 %, 9 %, 11 % and 13 %, it is known that the soil erosion of the latter is 3, 5, 6, 8 and 9 times respectively. It shows that the slope of the slope of the hillside ditch in the slope orchard should not exceed 1.5%.