Abstract: A seedling-growing sheet (1) is in the form of a laminate body (2) consisting of a band-like support member (3) and a porous sheet body (4) laminated on the support member (3). A large number of receptacles (6) for housing rice seeds (15) are formed in the sheet body (4) of the laminate body (2). These receptacles (6) are arranged apart from each other in the longitudinal direction of the support member (3). Formed in the laminate body (2) are cutting perforations (8) consisting of a large number of cut lines (9) along which planting pieces (10) each having at least one receptacle (6) are cut away from the laminate body (2). These cutting perforations (8) are arranged apart from each other in the longitudinal direction of the laminate body (2).

Abstract: In measuring a stress of a soft magnetic metal wire, an A.C. magnetic field exceeding a coercive force of the metal wire is applied to the soft magnetic metal wire with a tensile load applied thereto, using an exciting coil, thereby inducing an A.C. electromotive force through a detecting coil. An effective value of one or more higher harmonic wave components including a stress information of the soft magnetic metal wire in the waveform of the A.C. electromotive force is determined as a measurement amount. By taking higher harmonic wave components as an amount in this manner, the stress of the soft magnetic metal wire 4 can be measured correctly.