PROBLEM TO BE SOLVED: To provide lightweight seedling raising culture soil containing lightweight granular culture soil, lightweight culture soil mixed with rice husk charcoal and lightweight culture soil mixed with rice husk charcoal and further with soil, as a lightweight seedling raising material mixed with bamboo powder.SOLUTION: A bamboo material such as Phyllostachys pubescens, Japanese bamboo or bamboo grass is crushed into required small pieces, then pressure-kneaded by a pressure extruding apparatus with its internal pressure of at least 15 kg/cm2, cut with a cutter into minced shape with a length of 20-200 mm, discharged into the atmosphere from a perforated nozzle at the tip, and swellingly diffused to dissect hard texture and soft texture and to dissociate cellulose and hemicellulose that form cell walls, by lignin, thus obtaining loosened bamboo fiber chopped strands which are pulverized into fine powder of 10-200 microns to form a seedling raising mat.COPYRIGHT: (C)2013,JPO&INPIT【課題】竹粉配合の軽量育苗資材として、軽量粒状培土及び軽量培土に籾殻くんたん配合したものと軽量培土に籾殻くんたん配合さらに土を混入したもので軽量育苗培土を提供する。【解決手段】孟宗竹、和竹、笹竹等の竹材を所要の小片に破砕のうえ、加圧押出装置により少なくともその内部圧力が15Kg/cm2以上で加圧混練し、カッターでミンチ状にし且その長さを20~200mmに裁断のうえ、その先端の多孔なノズルより大気中に吐出し、膨潤拡散して硬組織と柔組織の解体と、細胞壁を形成するセルロース及びヘミセルロースをリグニンより解離させた解繊状の竹繊維チョップドストランドを用い、10~200ミクロンの微粉末に粉砕し育苗マットとする。【選択図】図1
