PROBLEM TO BE SOLVED: To overcome a problem that organic acid components such as acetic acid are known to be generated by an explosive-shattering treatment of wood chips, the organic component reduce pH of a ligneous crude fiber, inhabitation of microorganisms becomes difficult by effects of acidity when the wood chips are used as a soil improving material and soil improving performance is reduced.SOLUTION: At least one kind of fulvic acid or humic acid selected from a group of fulvic acid or humic acid manufactured by impregnating undecomposed organic articles of tree, grass, vegetable dust or deciduous leaf and deciduous branch into pyroligneous acid or bamboo vinegar which are ultra-strong acidic organic acids generated in a manufacturing process of coal and curing them for long time, fulvic acid or humic acid extracted from humic soil and fulvic acid or humic acid extracted from deposit soil at bottom of water area is added in an explosive-shattering treatment process S2 for obtaining a ligneous crude fiber by an explosive-shattering treatment of wood chips consisting of wood waste.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】 木材チップを爆砕処理すると酢酸等の有機酸成分が生成することが知られており、有機酸成分は木質粗繊維のpHを低下させるため、土壌改良資材として用いる時に酸性の影響によって微生物等の生息が困難となり、土壌改良性能を低下させるという問題があった。【解決手段】 木、草、野菜屑、若しくは落葉落枝の未分解の有機物を炭の製造過程で産出される極強酸性の有機酸である木酢液又は竹酢液に適量漬け込み且つ長期間養生することで製造されるフルボ酸又はフミン酸、腐植土から抽出したフルボ酸又はフミン酸、及び、水域の底部の堆積土から抽出したフルボ酸又はフミン酸の群から選ばれる少なくとも1種のフルボ酸又はフミン酸を、木材廃棄物からなる木材チップを爆砕処理して木質粗繊維を得る爆砕処理工程S2で、加えるようにした。【選択図】図1
