Factors of Soil Formation: A System of Quantitative Pedology |
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according accumulation acid Agriculture amount analyses annual areas arid average become brown calcium carbonate cent characteristics chemical classification clay climate colloidal compared composition concept considerable contains cover crop cultivated curve definition deposits depth derived determined distribution earth effect entire environment equation especially example exists expressed field forest functions geological given horizon humid humus igneous inches increase indicates influence layer leaching limestone loam loess mature means mineral moisture moraines nature nitrogen observed organic matter origin parent material particles pedology period plant Pleistocene podsol practical prairie present processes production quantitative rainfall ratio regions relation relationships relative represents result rock sand sandy shows silt slope soil formation soil properties soil types soil-forming factors surface Table temperature tion topography United values variables vary vegetation weathering whereas yield zone