The Protected Landscape Area Zahorie is spread on an area of 27 522 a on the Borska nizina lowland. It consists of the localities Horn les and Dolny les on the alluvium of the Morava river left bank and Kobyliarka elevation between the villages Borsky Svaty Jur and Laksarska Nova Ves Sandy (arenic) soils are spread on the area of 9052 ha (33% of the whole area). They are developed on eolian and alluvial sediments. They are without carbonates, what is the reason of their acidity. Soil acidity is increased from Mollic Fluvisols (CAm), Eutric Fluvisols (FMm), Dystric Regosols (RMm) to Haplic Podzols (PZm) in the catena of natural arenic soils without significant anthropic influences as cultivation, fertilization and liming are a result of pedogenetical processes. The lowest content of humus in very shallow humic horizon (0.2 in) was determined in Dystric Regosols (RMm). It corresponds to the composition of vegetation type Thymo angustifolii-Corynephoretum canescentis Krippel 1954 with low biomass production of the herb layer, which was determined in the area "Vo Vrskoch" near the village Laksarska Nova Ves. Eutric Fluvisols (FMm) in the locality "Cierny les" in the distric of the village Gajary has a deeper humic horizon (0.5 m), with higher content of humus. It was developed in the process of humification of plant residues of vegetation. The highest biomass production of the plant community type Pleurozio schreberi-Pinetum, Somsakova 1988, with higher biomass production of the herb layer. Highest biomass production of phytococnose Fraxino-pannonicae-Ulmetum Soo in Aszod 1936 corr. Soo in deep humus horizon creation (0.9 m) of soil type Mollic Fluvisols (CAm). This soil has the highest content of humic substances of high quality from arenic soils on the locality "Siroke" near by the village Vysoka pri Morave.
