Suchergebnisse

In the European Union, most of the wastes from the building sector are composed of earths. Earth construction may be an interesting outlet for the re-use of these wastes, while meeting the challenge of circular economy: in particular, it involves low-embodied energy processes and earth material can be reused for building by end-of-life. Nonetheless, the identification of suitable earths for construction remains an issue. To overcome this problem, an option may be to analyse earth building heritage, which is at least one-century old in Europe: indeed, earth employed in these buildings can be regarded as 'timetested', and thus suitable for construction. In this paper, more than 20 different earths collected inrammed earth heritage building in France are presented. The results are confronted both to literature and to several classifications employed in soil sciences. A classification system based on granularity and clay activity will be relevant to address the convenience of earth for building purposes

In the European Union, most of the wastes from the building sector are composed of earths. Earth construction may be an interesting outlet for the re-use of these wastes, while meeting the challenge of circular economy: in particular, it involves low-embodied energy processes and earth material can be reused for building by end-of-life. Nonetheless, the identification of suitable earths for construction remains an issue. To overcome this problem, an option may be to analyse earth building heritage, which is at least one-century old in Europe: indeed, earth employed in these buildings can be regarded as 'timetested', and thus suitable for construction. In this paper, more than 20 different earths collected inrammed earth heritage building in France are presented. The results are confronted both to literature and to several classifications employed in soil sciences. A classification system based on granularity and clay activity will be relevant to address the convenience of earth for building purposes

In the European Union, most of the wastes from the building sector are composed of earths. Earth construction may be an interesting outlet for the re-use of these wastes, while meeting the challenge of circular economy: in particular, it involves low-embodied energy processes and earth material can be reused for building by end-of-life. Nonetheless, the identification of suitable earths for construction remains an issue. To overcome this problem, an option may be to analyse earth building heritage, which is at least one-century old in Europe: indeed, earth employed in these buildings can be regarded as 'timetested', and thus suitable for construction. In this paper, more than 20 different earths collected inrammed earth heritage building in France are presented. The results are confronted both to literature and to several classifications employed in soil sciences. A classification system based on granularity and clay activity will be relevant to address the convenience of earth for building purposes

In the European Union, most of the wastes from the building sector are composed of earths. Earth construction may be an interesting outlet for the re-use of these wastes, while meeting the challenge of circular economy: in particular, it involves low-embodied energy processes and earth material can be reused for building by end-of-life. Nonetheless, the identification of suitable earths for construction remains an issue. To overcome this problem, an option may be to analyse earth building heritage, which is at least one-century old in Europe: indeed, earth employed in these buildings can be regarded as 'timetested', and thus suitable for construction. In this paper, more than 20 different earths collected inrammed earth heritage building in France are presented. The results are confronted both to literature and to several classifications employed in soil sciences. A classification system based on granularity and clay activity will be relevant to address the convenience of earth for building purposes

Dargelegt werden die Eigenschaften von rötlich-braunen ariden und zimtfarbenen siallitischen Böden in Libyen. Die das Wachstum und die Fruchtbildung von Olivenbäumen limitierenden Bodenfaktoren sind u.a.: ungünstiger Wasserhaushalt, hoher Gehalt an Karbonaten, Versalzung der Böden, hoher Gipsgehalt sowie ein Mangel an Nährstoffen. Es wird nachgewiesen, daß die Entwicklung des Wurzelsystems vorwiegend durch physikalische Eigenschaften der durchwurzelten Bodenschicht bestimmt wird. (DÜI-Ott)

The Shuttle Radar Topographic Mission (SRTM) imagery was used in 2012 to identify stream courses in Akure South Local Government Area (AKSLGA) where Akure (Latitute 7015'N and Longitude 5015'E) the capital of Ondo State Nigeria which had witnessed a tremendous urban sprawl in the last twenty years was located. The cultivation of vegetable in the inland valley areas was a way to improve the income and diet of the city dwellers. The polygonized boundary of AKSLGA which was superimposed on SRTM image was extracted out while the focal statistics, the contour lines at an interval of 10 m and the stream courses were generated using the Spatial Analyst Tools in ArcMap. The streams were each buffered at a distance of 100 m to generate the inland valley areas using the Analysis/ Proximity/ Buffer Tools. The soils were generally sandy loam while the average bulk densities and gravel content values were 1.53 g/cm3 and 9% respectively. The nutrient concentration showed mean values of 1.02 %, 11.2 ppm, 0.25 cmol/kg, 3.77 cmol/kg, 1.66 cmol/kg and 3.32 % for nitrogen, phosphorus, potassium, calcium, magnesium and organic matter respectively which were suitable soil conditions for vegetable production.

Soils of Khana Local Government Area of Rivers State, Southern Nigeria were evaluated using semi detailed soil survey for citrus cultivation. The purpose of this research was to evaluate the suitability of soils of the study area for the cultivation of citrus. The total land area covers 49,631.54 ha and was delineated into eight mapping units based on the soil types. One pedon each was dug in each mapping unit and described using the FAO system. The nonparametric method of soil suitability evaluation was used. Four soil orders, majorly Inceptisols/Cambisols, Entosols/Arenosols, Ultisols/Acrisols, and Alfisols/Lixisols, were identified in the area. The results showed that land requirements/characteristics such as climate (mean annual rainfall), wetness (depth to water table) and fertility made the land marginally suitable (S3) to not suitable (N) for citrus cultivation across the eight pedons. The three limitations for citrus cultivation in the area are climate (annual rainfall), wetness (depth to the water table) and fertility (low status of NPK and pH). The land is potentially suitable for citrus cultivation but currently marginally and not suitable due to these three limitations.