Mulching paper sheet

摘要

A mulching paper sheet having satisfactory mechanical strength, elongation, weathering resistance and biodegradation resistance while being used for plant culture, includes a paper sheet substrate formed mainly from a cellulosic pulp; a biodegradation-retarding agent comprising humic acid and/or a water-insoluble metal salt of humic acid and coated on or impregnated in the substrate; and optionally an antimicrobial agent contained in at least the longitudinal side edge portions of the paper sheet substrate.