Study on mechanization of mulching cultivation using biodegradable film for early season culture rice (Part 2): development of mulch slit cutting mechanism for biodegradable film using nylon cord

摘要

A mulch slit cutting mechanism that uses nylon cord was developed to create mulch slit in the biodegradable film (referred to as BF) laid on the paddy field. This mechanism features the use of highly safe nylon cord of grass cutters as cutting material, which was adapted to the transplanting arm of rotary-type transplanter, and the cutting of mulch slits immediately before transplanting by the impact of nylon cord. The motions of nylon cord and transplanting finger were simulated to determine the most suitable slit length. As a result, the mulch slit length was influenced by planting depth and plant spacing as well as nylon cord length and its angular position. At 120-160mm plant spacings and 10-50mm planting depths, the differences of theoretical and experimental values were within 5mm, and enough mulch slit lengths necessary for transplanting seedlings were cut. Therefore, the study recognized the usefulness of this mechanism as mulch slit cutting mechanism of a transplanter for paddy field mulching cultivation system.