Ivaylo Kirilov - Academia.edu (original) (raw)

Papers by Ivaylo Kirilov

The present study aims to establish the genetic-diagnostic characteristic of Ferric Leptosols and... more The present study aims to establish the genetic-diagnostic characteristic of Ferric Leptosols and Nudilithic Ferric Leptosols which are formed on rocks with high iron content. Thise soils are spread over hard red sandstones, quartzites and granite gneisses of the ridge parts and the upper (eluvium) parts of the slopes in the hilly part of the northeastern Sofia filed. The performed diagnostic assessment and characteristics give grounds to include the studied soils in the Bulgarian National Soil Classification at subtype taxonomic level as Ferric Lithozems and Ferric Rankers, and in WRB as Nudilithic Ferric Leptosols and Ferric Leptosols.

The genesis of anthropogenic soils is widely studied. Soil changes or the formation of new soil t... more The genesis of anthropogenic soils is widely studied. Soil changes or the formation of new soil types due to human activities are a basic and major factor about anthropogenic soils. A genetic-diagnostic characteristics of anthropogenic influences and the current processes, which influence the formation of specific by composition, properties and structure soils, has been performed. Generally human activities and the consequent running processes are of a different nature and the reflection of these activities on soil cover is durable and visible. All that provides grounds for anthropogenic soils to be grouped and systemized as a separate soil type with subtypes and to be correlated according to according to FAO diagnostics and classification (2014) and the accredited criteria for soil assessment in the world referential base.

The present article considers the criteria for diagnostics and identification of sandy soils in B... more The present article considers the criteria for diagnostics and identification of sandy soils in Bulgaria. The research so far has proved that they have a soil profile structure of the type A-AC-C, sand content over 75% in the surface horizon and of 80-90% in the soil formation rock. With some exceptions they are non-fragmented soils. The humus content most often varies from very low to low and average by way of exception. The total content of iron is most often low and in isolated cases it is higher, which could be considered as an exception, too. The soil reaction is slightly acidic to slightly alkaline. The relative and volumetric density are high and very high and the general porosity vary from low to average. According to the water-physical indicators these soils are hydrophilic and very rarely - hydrophobic. The carbonate variation determines to a greatest extent the Sandy soil classification on a lower taxonomic level. The sorption capacity is low to average while the base sat...

The study presents assessment of water repellency (WR) in non-humus reclaimed mine soils from the... more 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 assessed by water drop penetration time (WDPT) before and after laboratory heating at 65°C. Variation in WDPT of soil samples in both seasons was established before heating. The longest time was measured in April at the non-vegetated site. At the pine-vegetated site, these values are lower, but are typical for most of the samples. After heating, a decrease of WDPT at both sites was observed. Sub-surface samples show similar fluctuations between seasons before heating. Unlike in spring, extremely water repellent samples were found at the pine-vegetated site in summer. Dif...

Bulgarian Journal of Agricultural Science, 2018

Atanasova, I. M. Banov, T. Shishkov, Z. Petkova, B. Hristov, P. Ivanov, E. Markov, I. Kirilov and... more Atanasova, I. M. Banov, T. Shishkov, Z. Petkova, B. Hristov, P. Ivanov, E. Markov, I. Kirilov and M. Harizanova, 2018 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 areas containing clays and irregularly distributed lignitic particles are heterogeneous materials exhibiting small-scale spatial variability of water repellency. Non-vegetated and pine-afforested spoils from the area of Maritsa-East lignite coal basin in Bulgaria were studied. The technogenic soils were characterized by severe to extreme hydrophobicity and heavier texture at the pine-vegetated site, as well as extreme acidity (pH 3-4). Principle Component Analysis (PCA) and cluster analysis were carried out, in order to stud...

Ivanov, P., Atanassova, I., Shishkov, T., Dimitrov, E., Banov, M. & Kirilov, I. (2021). Assessmen... more 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 sites cover several regions with different land use – stubble site (without vegetation), acacia and pine plantations. Surface soil layers and those of deeper depths in the soil profile were investigated. Soil water repellency was determined by water drop penetration time (WDPT) test at ambient conditions and after heating in an incubator at 65°C. It was found that before heating, extreme water repellency prevails in the surface soil layers of the studied sites compared to the subsurface. It also covers the highest share of all soil samples. Water drop penetration time significantly correlates with the extracted organic carbon (EOC) conten...

Bulgarian Journal of Agricultural Science, 2018