Effects of the Soil Mixed With a Few Soil Amendment Matters on Soil Physical Properties and Young Camphor Tree Growth

27 Mar Effects of the Soil Mixed With a Few Soil Amendment Matters on Soil Physical Properties and Young Camphor Tree Growth

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Abstract

真砂土に土壌改良材 (ピートモース, 真珠岩ハーライト, 黒曜石パーライト) を混入して, 保水の増加, 固相率と土壌硬度の改善, さらにそれにクスノキポット苗を植え1年6ヶ月にわたる生育等を調査した, その結果, 保水力は真珠岩パーライトか他の2種に比べ抜群の成績を示し, 樹木生育も同じ傾向になったか, 3つの物理性の値と生育量の関係を重回帰分析で求めたところ, 生育を左右する最大要因は土壌硬度という結果を得た。

English Abstract

It is described with this paper how a few kinds of soil amendment matters improve the water-retentivity of the sand what is called “Masa” or “Masa-soil” and a few soil physical properties, and increase growth of young Camphor tree (Cin momun camphora) planted in treated soils.
The results of this study are follows:
1. Three kinds of soil amendment matters were adopted;(1) peat-moss, (2) expandedperlite and (3) expanded-obsidian. The soil treated by expanded-perlite had about twice amount of available water content by volume in comparison with non-treated soil, the others had only few amount. Expanded-perlite is a desirable matter to keep young trees alive in dry season without watering.
2. Tree growth also showed the best at the soil mixed with 40% expanded-perlite. Nevertheless, the soil mixed with 10% soil amendment matter almost had not effects on tree growth.
3. Soil physical properties were measured for determining effects to tree growth. As the result of multiple regression a lysis, it is concluded that tree growth was simply influenced by soil hardness without regard to available water content and soil solid phase.