Shin-etsu Chemical Co., Ltd.

Rikagaku Kenkyusho

Takao Oshima

Kinya Ogawa

Yoichi Hirasawa

Yoshiaki Nishimura

Seiji Sakai

Hiromi Ohsaki

Shigeyoshi Arai

Shohei Isomura

Kyoko Sugita

Kenichi Ito

Kenichi Itoh

Tatsuhiko Honguu

Masatsugu Kamioka

Yo-ichi Ishikawa

An artificial soil structure includes at least one hydrophobic layer of hydrophobic particles provided in a soil. A particle size of the hydrophobic particles can be 2000 micrometers and less. The hydrophobic particles are sand and/or dirt treated with a water-repellent agent or hydrophobic particles having a high molecular weight polymer. An artificial water-retentive soil structure includes a soil block containing a water-retentive agent and a hydrophobic layer of hydrophobic particles provided on the soil block. A method of preventing land desertification includes the steps of placing a hydrophobic layer of hydrophobic particles in a soil at a prescribed depth from the earth surface and controlling the water content in said soil.

Artificial soil structure and a method of preventing land

A method of laying a road characterized by spraying and impregnating a roadbed with 1 g/m.sup.2 to 500 g/m.sup.2 of a liquid water-repellent agent and then laying a road on said roadbed wherein said liquid water repellent agent is fluid at ordinary temperatures and contains as the main ingredients one or more compounds chosen from among silane-type compounds and organopolysiloxane derivatives.

Methods for laying roads

An agent for the prevention of salt damage of plants for use in intermediate soil comprised of water-repellent particles, and a method of preventing salt damage to plants from salty soil using an agent to establish a water-repellent layer as a layer above the underground water level. An agent for the prevention of salt accumulation in greenhouse soil comprised of hydrophobic particles which are substantially hydrophobic. A salt accumulation prevention layer containing an agent for the prevention of salt accumulation in greenhouse soil which is provided at the surface layer or a prescribed depth from the surface layer of the greenhouse soil.

Agent for prevention of salt damage of plants and a method of preventing

Silicon isotopes are effectively separated by irradiating a polysilane compound or a fluoromosilane compound according to this invention with infrared laser rays. The polysilane compound is defined by the formula.

Working substances used in laser isotope separation and method of laser

Growing community of inventors

Kubiki-mura, Japan

Takao Oshima