Nitisol

Nitisol

▪ FAO soil group
 one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO) (soil). Occupying 1.6 percent of the total land surface on Earth, Nitisols are found mainly in eastern Africa at higher altitudes, coastal India, Central America, and tropical islands (Cuba, Java, and the Philippines). They are perhaps the most inherently fertile of the tropical soils because of their high nutrient content and deep, permeable structure. They are exploited widely for plantation agriculture.

      Nitisols are technically defined by a significant accumulation of clay (clay mineral) (30 percent or more by mass and extending as much as 150 cm [5 feet] below the surface) and by a blocky aggregate structure. Iron oxides and high water content are believed to play important roles in creating the soil structure. Nitisols are also strongly influenced by biological activity, resulting in a homogenization of the upper portion of the soil profile. These soils are related to the Alfisol and Inceptisol orders of the U.S. Soil Taxonomy. Related FAO soil groups originating in tropical climates and also containing layers with clay accumulations are Acrisols (Acrisol) and Lixisols (Lixisol).

* * *


Universalium. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Nitisol — Als Nitisol (früher Nitosol) wird nach WRB Klassifizierung ein Bodentyp der immerfeuchten Tropen bezeichnet. Das Bodenprofil mit der Horizontfolge A/(EBt)/Bt/BtC/CBt ist tiefgründig verwittert. Dabei kann der Eluviationshorizont (E) nicht… …   Deutsch Wikipedia

  • Nitosol — Nitisol (früher Nitosol) ist ein Bodentyp (soil group) aus den wechsel feuchten Tropen gemäß der FAO Klassifikation (World Reference Base). Das Bodenprofil mit der Horizontfolge A/(EBt)/Bt/BtC/CBt ist tiefgründig verwittert. Dabei kann der… …   Deutsch Wikipedia

  • World Reference Base — Die World Reference Base for Soil Resources (Abkürzung WRB) ist eine Bodenklassifikation, die als internationales Kommunikationsmittel für den Fachbereich Boden geschaffen wurde. Sie ist mehr oder weniger weltweit gültig, um Informationen über… …   Deutsch Wikipedia

  • World Reference Base for Soil Resources — La World Reference Base for Soil Resources (WRB: acrónimo (en inglés) Base referencial mundial para recursos de suelos), es el estándar internacional taxonómico de sistema de Clasificación de suelos respaldado por la International Union of Soil… …   Wikipedia Español

  • Acrisol — ▪ FAO soil group  one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO) (soil). Acrisols form on old landscapes that have an undulating topography and a humid tropical climate. Their natural… …   Universalium

  • Alisol — ▪ FAO soil group  one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO) (soil). Alisols are highly acidic, poorly drained soils prone to aluminum toxicity and water erosion. Liming and fertilization …   Universalium

  • Lixisol — ▪ FAO soil group  one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO) (soil). Lixisols develop on old landscapes in a tropical climate with a pronounced dry season. Their age and mineralogy have… …   Universalium

  • Plinthosol — ▪ FAO soil group  one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO) (soil). Plinthosols form under a variety of climatic and topographic conditions. They are defined by a subsurface layer… …   Universalium

  • FAO Soil Classification System — ▪ Table Soil classification system of the Food and Agriculture Organization   soil group  abbrevi ation defining  characteristics name derivation percent of Earth s land area See as table: Soils defined by parent material   Andosol AN volcanic… …   Universalium

  • Embu District — Basisdaten Einwohner  Bevölkerungsdichte 296.992 Einw. 409 Einw./km² Fläche 725,5 km² Koordinaten …   Deutsch Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”