Characteristics of Rendzinas in the Ludogorie Region
Authors: Vladimir Ilinkin, Simeon Bogdanov, Antonia Goleva
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The paper presents results from an investigation on soils located in the Ludogorie
region. Rendzinas (Rendzic Leptosols, FAO, 2006) have been studied. They are situated in
the Lower forest vegetation zone (0–600 m a.s.l.) of the Moesian forest vegetation area. Soil
samples have been taken from seven soil profiles. The study covers an area of 3000 m2
factors of soil formation have been characterized. Soil physical and chemical properties have
been investigated. The results have been processed by a statistical programme. The arithmetic
means (M) and standard deviations (±SD) have been calculated.
The studied soils are characterized by favourable physical properties, e.g. water-resistant
crumb and granular structure, porosity and bulk density Their low supply of plant available
water is due to the high permeability of the parent material.
The tendency of calcium to form complex insoluble compounds with humic
substances (Knežević & Košanin, 2010) is a prerequisite for reduced accessibility of N and
humus, although are not in low contents.
The calcium content is naturally higher given the specific features of the parent
material. Antagonism between the ions of Ca and К, Ca and Mg (Jorova, 1995) is a
prerequisite for reduced accessibility of К and Mg, although, soil texture with a predominant
presence of silt and clay, allows for higher nutrient content than that of other primitive soils.