Kiryuerde
Kiryuerde ( Japanese 桐 生 砂 , Kiryūzuna , Eng . " Kiryū gravel"), also misleading: vitamin earth , comes from the region around the Japanese city of Kiryū in the south of Gunma prefecture and is a volcanic gravel granulate. Due to the high iron content, it has a red color.
Kiryuerde is very dimensionally stable and permeable to air due to its porosity and can store water relatively well. As with the similar Akadama earth , this prevents root rot .
In Japan it is widely used in the cultivation of orchids , Rohdea japonica and wild grasses. It is also well suited as an additive for other soil mixes.
It is usually available in stores in various grain sizes between 1 and 12 mm. Outside of Japan, Kiryuerde is used for bonsai , mainly for Pinus and Juniperus species ; but also deciduous trees thrive in it. It serves to support growth and helps in the recovery of susceptible or sickly trees. Pine trees in particular can lose vitality and growth after a few years; they can then be planted in pure Kiryu soil for 2–3 years.
Individual evidence
- ↑ a b c 桐 生 砂 （き り ゅ う ず な） . In: ガ ー デ ニ ン グ ・ フ ラ ワ ー . Retrieved May 23, 2011 (Japanese).