Nursing method with polypropylene spunbonded fabric in rice.

摘要

The possible utilization of polypropylene spunbonded fabrics for covering the plants in rice seedling nurseries was investigated. Considering the cropping systems available in the southern part of Korea, sowing dates were fixed at April 5 and April20 for single cropping and May 6 and May 26 for double cropping. The nursery period was 35 days for each sowing date. Four different thickness of polypropylene spunbonded fabrics, 40, 60, 80, 100 g/m2, were tested. The temperature and light intensity were not significantly different among the thicknesses of polypropylene spunbonded fabrics. Light intensity was significantly reduced in polypropylene spunbonded fabric (72.2 Klux) compared with polyethylene film (85.5 Klux), but the reduced light intensitywas enough for seedling growth. The temperature with polypropylene spunbonded fabric covering during low air temperature periods was higher than that in polyethylene film tunnels. At transplanting, the rice seedlings grown under polypropylene spunbondedfabric were shorter (17 cm) but healthier than those grown under polyethylene film (23 cm). The estimated possible nursery periods using the polypropylene spunbonded fabric covering may start from April 1 at Chinju (plain area in Southern Korea, 20 m altitude) and April 15 at Susang (mountainous area, 430 m altitude). Labour hours and cost were reduced by about 28% and 48%, respectively.