| 摘要 |
PURPOSE:To eliminate a special hydrophobic agent and to eliminate a levelling work of surplus soils, by a method wherein granular soil, in which an earth coagulant is added in digged-up trench soil to mix them together, is buried as a hydrophobic agent togetherwith a drain pipe. CONSTITUTION:A trench 2 is digged up deeper than a plowsole 1 of a field, an earth coagulant and water are mixed in the digged-up trench soil mixture to prepare granular soil 3. A drain pipe 4 having a number of pores is installed in the tranch 2, the granular soil 3 is buried as a hydrophobic agent togetherwith the drain pipe 4, and cultivated soil 5 is back-filled on the granular soil 3. Plural lines of closed conducts 7, communicated to a basic drainage channel 6 formed by means of the tranch 2, are provided below the plowsole 1 to improve drainage and permeability of a field. This, since a soil coagulant is added in digged- up trench soil to prepare a hydrophobic agent, eliminate a special hydrophobic agent such as chaff, and prevents the digged-up trench soil from remaining on the surface of a field, resulting in the possibility to eliminate a levelling work for surplus soils. |
