| 摘要 |
PURPOSE:To obtain soil capable of reserving the heat and simply keeping a temperature suitable for cultivating a plant at a low cost and further a structure for reserving the heat of soil. CONSTITUTION:The objective soil 2 comprises earth (2a) and a heat reserving material (2b) and is capable of reserving the heat. The heat reserving material (2b) is prepared by mixing 100 pts.wt. paraffins which are a heat reserving component with 5-30 pts.wt. hydrocarbon-based organic polymer which is a binder component by a mechanical means. Furthermore, the objective structure (T) for reserving the heat of the soil 2 having an auxiliary heating means 5 additionally installed in the soil 2 capable of reserving the heat is obtained. Thereby, the soil temperature can be kept within a range suitable for cultivating a plant and the running cost for reserving the heat of the soil can remarkably be reduced. The surface treatment of the heat reserving material, the formation of a shielding layer in the structural material and a vessel or a tank for housing the heat reserving material are not required. As a result, the cost for forming the structure for reserving the heat of the soil can be reduced. |
