PROBLEM TO BE SOLVED: To provide a method for producing bark fiber culture soil by which barrier to growth can be reduced as much as possible with simple means and also production of the bark fiber culture soil is facilitated so as to improve production efficiency.SOLUTION: The method for producing bark fiber culture soil includes: a primary crushing step (Sa) for primarily crushing bark raw material a curing step (Sb) for piling bark fiber materials primarily crushed in the primary crushing step to cure the materials for a prescribed period of time a secondary crushing step (Sc) for secondarily crushing the bark fiber materials cured in the curing step and a fibrillation step (Sd) for fibrillating the bark fiber materials secondarily crushed in the secondary crushing step. At least at any one of a period between the curing step and the secondary crushing step, a period between the secondary crushing step and the fibrillation step, and a period after the fibrillation step, sublimed sulfur powder-mixing steps (Se1, Se2, Se3) for admixing sublimed sulfur powder to the bark fiber materials are set up so as to admix 0.45-2.7 pts.wt. of the sublimed sulfur powder to 100 pts.wt. (dry part by weight) of the bark fiber material.COPYRIGHT: (C)2012,JPO&INPIT【課題】 簡易な手段で生育障害をできるだけ低減できるようにするとともに、製造も容易にして製造効率の向上を図る。【解決手段】 樹皮原料を一次粉砕する一次粉砕工程(Sa)と、一次粉砕工程で一次粉砕された樹皮繊維材料を堆積して所要期間養生する養生工程(Sb)と、養生工程で養生された樹皮繊維材料を二次粉砕する二次粉砕工程(Sc)と、二次粉砕工程で二次粉砕された樹皮繊維材料を解繊処理する解繊処理工程(Sd)とを備え、養生工程と二次粉砕工程との間、二次粉砕工程と解繊処理工程との間、解繊処理工程の後の少なくとも何れかのときに、樹皮繊維材料に硫黄華粉末を混合する硫黄華粉末混合工程(Se1,Se2,Se3)を設け、樹皮繊維材料100重量部(乾物重量部)に対して、硫黄華粉末を、0.45~2.7重量部混合した。【選択図】 図1
