However, after twice field preparation and plant growing periods, the infiltration rate will be reduced and the hardpan function can be fully recovered in the following cultivation.

• 显示硬盘层经破坏后，可提高入渗率以增加地下水补注量。唯经由二次的整田及作物生长期间之乾湿交替过程，将逐渐降低土壤入渗率，并于下一期作完全恢复原有硬盘层之机能。