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Soil value ((ドイツ語:Bodenwertzahl)) or BWZ is a comparative assessment of soil quality used in Germany. It is determined from soil sampling data and ranges from 0 (very low) to 100 (very high). According to the Geological Service of the state of North Rhine-Westphalia, the soil value of arable land is based on a field assessment framework which combines an assessment of soil type, soil condition (soil development) and the parent material of which the soil is composed. The result, the soil value, expresses the relative net income that, under normal and proper management, is determined only by the profitability of the soil. Additions or deductions in this value to take account of variations in yield due to terrain and climate (e.g. average annual temperature) give the field value (''Ackerzahl'').〔 == Range of values == The following range of values and colour scheme is used:〔(''Wertzahlen der Bodenschätzung'' ) at www.gd.nrw.de. Accessed on 2 Sep 2012.〕 Very poor 0 - 18 brown Poor 18 - 35 red Medium 35 - 55 orange High 55 - 75 yellow Very High 75 - 100 green The values exhibited by different types of soil are: Sand 0 - 11 Sandy loam 11 - 30 Heavy to clayey loam 31 - 50 Loam, partly with loess covering 51 - 70 Loam with loess covering 71 - 90 Loess 91 -100 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Soil value」の詳細全文を読む スポンサード リンク
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