The classification of soils originated from three main sources: from early empirical soil surveys, from folk soil classifications and from scientific theory of pedology. The first soil classifications reflected their origin in different extent, and still remain certain features of their initial sources. The actual situation in soil classification is discouraging, mainly due to the diversity of ...

a r t i c l e i n f o Here we analyze the past and present roles of the five soil-forming factors in USDA Soil Taxonomy. As opposed to the 7th Approximation of 1960, the factorial and genetic approach is clearly present in Soil Taxonomy. Soil climate is the most important factor in Soil Taxonomy. It is used at the highest level to define two of the 12 soil orders: Aridisols, the soils of the dr...

this paper reports some species of ameroseiidae from various habitats in different parts of iran. ameroseius bassolase (vargass, 2001)has been reported from iran, but it was a misidentification of sertitympanum aegyptiacus nasr & abow-awad, 1984. redescription of ameroseius lidiae bregetova, 1977 based on female specimens is also presented.

A critical evaluation was conducted on the complexity in teaching Soil Taxonomy to students of soil classification. Since its debut in the 1960 International Soil Science Conference under the name of "Soil Classification, Comprehensive System, 7th Approximation," Soil Taxonomy has brought radical changes in concepts and nomenclature. The principles of this new system are perhaps superior to any...

Although fertility capability classification (FCC) has high performance in land evaluation and soil maps interpretation, so far it has been less attended in land evaluation studies. Therefore, qualitative (FCC method) and quantitative (Riquer index) land fertility capability evaluation for Wheat and Rice cultivation and comparison of Soil Taxonomy and WRB classification with FCC were chosen as ...

knowledge about spatial soil variation in terms of measured pedodiversity offers the possibility to estimate the quality and variance within a soil map. diversity indices and abundance distribution models are statistical tools which ecologists have applied for decades for analyzing the intrinsic regularities of various ecological entities. in this study relationships between soils evolution, la...

fying landscape attributes which are believed to contain similar soils (Hudson, 1992). “Landscape position” can The key Soil Taxonomy is based upon the idea that certain properbe considered to be a geographic approach to classificaties can be used to define populations of soils from the soil continuum. tion, in which combinations of surficial and stratigraphic The soil mapping paradigm is that ...

An extensive screening of soil samples from Kerala State,India,gave a new streptomycete, Streptoverticillium quilonensis. Its taxonomy is described in detail.

a r t i c l e i n f o In Soil Taxonomy three diagnostic subsurface horizons reflect clay enrichment: the argillic, kandic, and natric horizons. Clay illuviation is recognized in Soil Taxonomy at some level in 10 of the 12 orders, including the percent of the soil series in the USA contain taxonomically defined clay-enriched horizons. However, many other soils contain Bt horizons that do not qua...