PROBLEM TO BE SOLVED: To provide slope spraying greening methods, especially vegetation base material spraying method, for enabling the strength of a vegetation base material to enhance while enabling a netting work to be omitted, when spraying alone to a thickness of 3 to 10 cm, particularly when spraying to a thickness of 3 to 5 cm that is most frequently employed.SOLUTION: Provided is a vegetation base material used in a greening method in which a vegetation base material is directly sprayed onto a slope, not in combination with a netting work as a greening foundation work, the vegetation base material being a mixture at least comprising a growth base material that is a main material, a clay mineral, a first short fiber material A, and a second short fiber material B, for the first short fiber material A and the second short fiber material B, relatively, the first short fiber material A is hard and has a long average fiber length, and the second short fiber material B is soft and has a short average fiber length. The average fiber length of the first short fiber material A is 4.5 cm ± 3.0 cm, and the average fiber length of the second short fiber material B is 2.0 cm ± 1.0 cm.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】法面吹付緑化工法、特に植生基材吹付工において、単独で３～１０ｃｍ厚に吹付した場合、特に最も採用されるケースが多い３～５ｃｍ厚に吹付した場合に網張工が省略できると共に、生育基盤の強度を増強させる。【解決手段】緑化基礎工として網張工を併用せずに植生基材を傾斜地に直接吹き付ける緑化工法に用いる前記植生基材であって、主材料となる生育基盤材と、粘土鉱物と、第１の短繊維材Ａと、第２の短繊維材Ｂとを少なくとも含む混合物であり、前記第１の短繊維材Ａと前記第２の短繊維材Ｂは、相対的に、前記第１の短繊維材Ａが硬質で平均繊維長が長く、かつ、前記第２の短繊維材Ｂが軟質で平均繊維長が短いことを特徴とする。前記第１の短繊維材Ａの平均繊維長が４．５ｃｍ±３．０ｃｍ、かつ、前記第２の短繊維材Ｂの平均繊維長が２．０ｃｍ±１．０ｃｍである。【選択図】なし
