Summary
Salt accumulation in soils is one of the serious problems, particularly in greenhouse culture in Japan and all agricultural production in the arid and semi-arid regions of the world. As a countermeasure to such salinization in soil, we have developed a new method to capture the salt accumulating on the soil surface with using "salt capturing device" attached on them. The device was composed of multi-layerd medical gauze, a vinyl sheet, and/or a gauze rolled and shaped like a stick. Some basic experiments were performed to use the soils having the differrent textures, under the several atmospheric environments in the laboratory. In this paper, basic characteristics for evaporation, solute transport, and the amount of salt captured on the devices, were discussed.HomePage
It is convenient to use the definition for the capturing effectiveness, as the ratio of the captured salt to the amount of salt transported to the soil surface during evaporation. The averaged effectiveness of the flat-sheet type, G5 and GS, were beyond about 80 %, and the restricted evaporation type, using a thin vinyl sheet, had an effectiveness of over 90 %, a value of which was independent of the soil texture and atmospheric environmental conditions.Keywords: salt accmulation, evaporation, salt capturing device, capturing effectiveness