Toma Shishkov

• Agricultural Academy - Bulgaria

The soils from the central part of Sredna Gora Mountain in Bulgaria were studied aiming to establish the occurrence of contemporal soil forming processes occured in the forest ecosystem. Soils were analyzed to determine the carbon content, the soil organic matter composition and the total soil acidity. The precise soil classification based on the d...

The result of the survey carried out on the territory of the Sofia-city municipality is presented, in relation to the application of the Program for the protection, sustainable use and restoration of soils as a limited and non-renewable natural resource. The obtained data on the Chomic Luvisols nearby the area of Kremikovtsi debate the basic physic...

The paper deals with soil properties characterized the intrinsic peculiarity of studied Chromic Cambisols from the Upper Thracian Lowland, in the Southern Bulgaria. To fulfill the aim, a systematic survey and sampling have been carried out on the terrain with conventional and organic systems of farming. Soil physical, chemical and physicochemical p...

The paper deals with statistical analyses of data on soil properties of Pellic Vertisols selected from the eastern as well western part of the Upper Thracian Lowland, in Southern Bulgaria. Based on the survey in 2019, 2020 and 2021 at conventional and organic farming the data was processed using the statistical package Statgraphics (Anova). Soil te...

Coal ash reclaimed Technogenic soils from the area of Maritsa-Iztok lignite coal basin in Bulgaria were studied for three types of land use, i.e. cereals stubble, acacia and pine vegetated sites. Coal (fly) ash, a waste product from the thermal power plant has been added to the spoils containing geological materials that have been excavated in the...

Ivanov, P., Atanassova, I., Shishkov, T., Dimitrov, E., Banov, M. & Kirilov, I. (2021). Assessment of soil water repellency in reclaimed soils under different land use. Bulg. J. Agric. Sci., 27 (4), 712-718 Study on soil water repellency in reclaimed Technosols from the area of Obruchishte village, Maritsa-Iztok Mines has been carried out. Sampling...

Soil maps constitute a key factor in managing agricultural and forest plots. Their importance has increased with the implementation of innovative methods, such as precision agriculture, which are targeting the resilience to regional climate changes. Having up-to-date information on the soil current status is of extreme importance for updating the e...

Farms in mountainous areas and other areas with significant natural constraints are disadvantaged as they have lower productivity and higher production costs. The CAP provides specific additional support for farmers in these areas. In order to ensure the efficient use of EU funds and the equal treatment of farmers throughout the Union, mountainous...

The study presents assessment of water repellency (WR) in non-humus reclaimed mine soils from the region of Maritsa-Iztok Mines, Bulgaria. Soil samples from two experimental plots (under black pine and without vegetation), from depths 0-5 (10) cm and 10-20 cm, in different seasons (spring and summer) were studied. Soil water repellency (SWR) was as...

Relationships between soil water repellency, physical and chemical properties in hydrophobic technogenic soils from the region of Maritsa-Iztok coal mine in Bulgaria. Bulg. J. Agric. Sci., 24 (Suppl. 2): 10-17 Soil water repellency (soil hydrophobicity) is considered a key mechanism for sequestration of organic carbon. Technogenic soils from mine a...

Soil characteristics are result of the soil development stages and depend on the intensity and duration of weathering and soil forming processes. Investigations on local environment constituents are associated with studies on the representative soil units and on the morphological, physical, chemical and mineralogical properties of soil varieties. T...

The present study describes signature lipid biomarkers in reclaimed mine soils, an unreclaimed spoil and a natural soil (Vertisol) for a major coal mine basin in Eastern Europe. Alkanes, fatty acids and fatty alcohols, as well as coal biomarkers were abundant in the mine soils and the unreclaimed spoil. The alkanes distribution in the reclaimed min...

The heterogeneity of soil physical properties of Fluvisols, lack of large pristine areas, and different moisture regimes on non-flooded and flooded terraces impede the possibility to find a soil profile which can serve as a baseline for estimating the impact of natural or anthropogenic factors on soil evolution. The aim of this study is to compare...

Most of soil functions depend directly or indirectly on soil water retention and transmission, which explains their importance for many environmental processes within Earth's Critical Zones. Soil hydraulic properties are essential in irrigation and drainage studies for closing water balance equation, for predicting leaching of nutrients, for water...

Soil is a basic natural resource and therefore farms, livestock, forests and waters from watersheds resolve their problems on the soil. The Zlatitsa-Pirdop valley forms a closed air pool which is crucial for the distribution of harmful substances (emitters). The selected soil survey area is linked directly to the threats to soil identified in the E...

Most of soil functions depend directly or indirectly on soil water retention and transmission, which explains their importance for many environmental processes within Earth's Critical Zones. Soil hydraulic properties are essential in irrigation and drainage studies for closing water balance equation, for predicting leaching of nutrients, for water...

Region occupies the foothills at the central part of Sredna Gora Mountain. The terrain is characterized as a high hilly to mountainous and rugged with deeply developed river network. In terms of climate the region belongs to the Sub-Balkan's mountainous climatic region. In the past, vegetation was mixed deciduous forests. Today forest vegetation is...

The paper dials with the interpretation of variables of new data of organic matter composition and exchange cations composition of soils from sub-Balkans valleys of central part of Bulgaria. The composition of organic matter is used as a reflection of environment in valleys where the organic matter state is controlled by the specific balance of hum...

The present study describes the basic chemical and physico-chemical characteristics of reclaimed soils and waste slag from waste dumps of Pernik coal mine basin for assessment of the present status of restoration processes following a technical and biological reclamation. The study sites are spoils near Baikusheva neighborhood, slag dumping sites a...

Purpose The purpose of this study was the investigation of sediment provenance and soil formation processes within a Mediterranean watershed (Koiliaris CZO in Greece) with particular emphasis on natural and manmade terraces. Material and methods Five sites (K1–K5) were excavated and analyzed for their pedology (profile description), geochemistry...

Настоящата книга „Черноземите в България – проблеми, оценка, използване и опазване. Научни трудове” се издава по случай 130 години от написването на капиталния труд в естест- воизпитателните науки „Русский чернозем” от В. В. Докучаев през 1883 г., с което се поставят основите на науката за почвите в света, 140 години от рождението на основоположник...

Historical review reveals the several stages in the study and followed systematic of Chernozems, which were conducted in the country in accordance with the agricultural practice needs in different periods and today are linked to the Common Agricultural Politics (CAP) of the European Union. The actualization of the classification of Chernozems is a...

Soil water retention is of primary importance for majority of soil functions. The characteristics derived from Soil Water Retention Curve (SWRC) are directly related to soil structure and soil water regime and can be used as indicators for soil physical quality. The aim of this study is to present some parameters and relationships based on the SWRC...

Ecological conditions, and in particular, soil forming factors responsible for pseudopodzolic forest soil development are described in this chapter. The genetic approach toward the dynamic of evolution of the type of pseudopodzolic forest soils is based on the conception of genetic horizons and explanation of soil properties. In relation with diffe...

In the context of globalization of the planet, the relation of soils and humans is a decisive matter directly related to the quality of life of mankind. Our relation to soil is connected to all the components of the environment, including land, air, and water, that are vital conditions for human existence. The surface of the dry land on earth is 14...

Ecological conditions and in particular soil forming factors responsible for the development of zheltozem soil are described in this chapter. The genetic approach toward the dynamic of evolution of the type of zheltozem soils is based on the conception of genetic horizons and explanation of soil properties. In relation with different soil forming f...

Ecological conditions and in particular soil forming factors responsible for the development of the group of soils manifested morphologically slight development are described (Leptosols, Regosols, Arenasols, Terra rossa, Technosols) in this chapter. The contemporary profiles status is shown in relation with different soil forming factors. Scientifi...

Ecological conditions and in particular soil forming factors responsible for the development of the group of hydromorphic soils with gley properties are described in this chapter. Different soil forming factors define the status of excess soil moisture. Scientific information provided the sequence of layers or horizons, soil texture, structure, and...

Ecological conditions and in particular soil forming factors responsible for the development of cinnamonic forest soil are described in this chapter. The genetic approach toward the dynamic of evolution of the type of cinnamonic forest soil is based on the conception of genetic horizons and explanation of soil properties. In relation with different...

Soil-forming factors responsible for the development of alluvial and deluvial soil are described in this chapter. The genetic approach toward the dynamic of evolution of the alluvial and deluvial soil type is based on the conception of sedimentation and explanation of soil properties. In relation with different soil-forming factors, the contemporar...

Ecological conditions and in particular soil forming factors responsible for the development of dark mountainous forest and mountainous meadow soil are described in this chapter. The genetic approach toward the dynamic of evolution of the dark mountainous forest and mountainous meadow soil type is based on the conception of genetic horizons and exp...

In Bulgarian, “soil” has another meaning which is: beginning, start, commence, lead off, start up, initiate, jump off, prototype, creation.

Ecological conditions, and in particular the soil forming factors responsible for gray-brown forest soil development are described in this chapter. The genetic approach toward the dynamic evolution of the type of gray-brown forest soils is based on the conception of genetic horizons and the explanation of soil properties. In relation to different s...

Ecological conditions and in particular soil forming factors responsible for the development of brown forest soil are described in this chapter. The genetic approach toward the dynamic of evolution of the brown forest soil type is based on the conception of genetic horizons and explanation of soil properties. In relation with different soil forming...

Ecological conditions and in particular soil forming factors responsible for the development of rendzinas (humus-calcareous) soils are described in this chapter. The contemporary profiles status is shown in relation to different soil forming factors. Scientific information and data provide horizons, soil texture, structure, and properties as well a...

Ecological conditions and in particular soil forming factors responsible for the development of smolnitsa are described in this chapter. The genetic approach toward the dynamics of evolution of the type of smolnitsa is based on the conception of genetic horizons and explanation of soil properties. In relation with different soil forming factors lik...

Ecological conditions, and in particular soil forming factors responsible for the development of chernozems are described in this chapter. The genetic approach toward the dynamic of evolution of the type of chernozems is based on the conception of genetic horizons and explanation of soil properties. In relation with different soil forming factors l...

Ecological conditions and in particular soil-forming factors responsible for the development of saline soils are described in this chapter. The dynamics of evolution of the meadow solonetz and meadow solonchak soil type is based on the conception of the explanation of soil properties in relation with soil forming factors. Information and data from...

The development of soil science in Bulgaria came about due to the urgent need to increase the economic prosperity of the country and find effective ways to raise crop yields.

Population growth and increasing land use intensity lead to growing demands and exploitation of natural resources. Soils are among the most important and most endangered natural resource entities. In order to plan and implement sustainable soil management practices and to facilitate the rational exploitation of the resource, more detailed informati...

Dissemination level Confidential until the end of the project and until release by COM, then Public Delivery date 31.3.2012 Status 0-oder Draft Author(s) eContentplus This project is funded under the eContentplus programme 1 , a multiannual Community programme to make digital content in Europe more accessible, usable and exploitable. 1 OJ L 79, 24....

Publisher: Paris-Lodron University of Salzburg, Austria

The study presents results on the informativity and spatial variation of soil aggregation characteristics in one of the Critical Zone Observatories (CZO) in Europe – Fuchsenbigl, Austria. Water stable aggregates of different size were measured, and strong relationships between soil aggregation estimates were found. The horizontal variation of water...

The study summarizes the tasks and some of the obtained results in the frame of ongoing GS Soil project by the Institute of Soil Science "Nikola Poushkarov" (ISSNP). An overview of the contribution of ISSNP is done concerning: soil related theme catalogue; legislation framework of intellectual property's rights in Bulgaria; results of questionnaire...