The Sickle is one of the many tools used for managing your farm in Harvest Moon: Friends of Mineral Town and Harvest Moon: More Friends of Mineral Town. It is used for clearing/cutting crops, grass, and weeds. You can upgrade your tools by giving the appropriate ore and fee to Saibara at the blacksmith's shop. You can measure your upgrade level in the tools menu. Every 100% is an upgrade and will denote the level you can upgrade to with a miniature ore icon of the appropriate level.