The rapid reduction in the sweet potato crop reflects two phenomena: First, the movement of the rural population to the cities. Even though the sweet potato does not require much care, its planting and harvesting still require lots of manpower.
甘薯產量逐年減少，是很可惜的事，因為它既美味、營養、價廉，且可在二期水稻間的休耕時期種植，使田地充分利用。