Mariana Hristova

• Agricultural Academy - Bulgaria

The aim of this study was to characterize the particles and pores size distributions of coarse textured soils and to relate them with the indicators for soil physical quality. Four sites in the region of Blagoevgrad, southwestern Bulgaria were selected. The dominant plants grown in the region are tobacco and vegetables on coarse textured Eutric Lep...

The key to sustainable land management is to maintain a positive nutrient balance in the soil and preserve its fertility. The current study investigates six organic amendments - varying in type and macronutrient content, and their residual effects on soil nutrient status. After composting, a significant increase in the content of total N, NO3-N, P2...

Всяка природна вода съдържа определено количество радиация. Наличието на радионуклиди във водните източници може да се дължи на естествените радиоактивни елементи, срещащи се в скалите, каквито са основните продукти на разпад на урана и тория или да имат антропогенен произход, отложени най-вече чрез въздушния фолаут. Предмет на настоящото изследван...

The goal of the present study is to assess the soil quality in Bulgaria using (i) an appropriate set of soil quality indicators, namely primary nutrients (C, N, P), acidity (pH), physical clay content and potentially toxic elements (PTEs: Cu, Zn, Cd, Pb, Ni, Cr, As, Hg) and (ii) respective data mining and modeling using chemometrical and geostatist...

One way to reduce environmental stress and safeguard soil fertility and ecological sustainability in crop production is by adding compost to the soil substrate. Supplying the soil with organic matter improves its chemical and physical characteristics, leading to better plant growth and development and increasing yield. The study presents a pot expe...

In the region of Srednogorie, some soils own two main restricting normal development of vegetation factors-acidity and high levels of copper. Based on this problem in the vulnerable area as part of the environmental monitoring network and the need for an adequate solution, a vegetation experiment with contaminated soils presents. The vegetation exp...

Under controlled conditions, a greenhouse pot experiment was carried out with lettuce and granulated compost Uni Granules-Parvomay on alluvial-meadow soil (Fluvisol). The influence of increasing compost rate on chlorophyll a, chlorophyll b, chlorophyll a+b, carotenoids, total pigments content and nitrogen in lettuce was studied. The highest content...

Chitosan has become increasingly applied in agriculture worldwide, thus entering the soil environment. We hypothesized that chitosan should affect the water stability of soil. Since this problem has not been studied to date, we examined, for the first time, the influence of chitosan on the water stability and wettability of soil aggregates. The agg...

Degraded land (formerly ‘reclaimed’) after surface-coal-mining is a serious problem in South Wales. This project uses forestation to foster soil development on opencast coal-mine spoil technosols. It compares records of humification and the soil microbiological system (microcoenosis) using paired data from the same plantings in 1998 and 2018. Stati...

To ensure environmental sustainability of crop production, there is currently a growing interest in exploring the benefits and opportunities in the usage of organic amendments, аs an alternative to mineral fertilization. Organic fertilization can enhance plant nutrition, increase yields and quality, protect soil fertility. The use of test cultures...

The paper deals with a mining region of Bulgaria in the Sub-Balkan mountain valleys where there is enrichment of the rock material in copper, gold and other valuable metals and minerals. The study area is localized in the Southwest of Chelopech mining-close to the watershed of Topolnitsa River. A monitoring network has been set up. The dominated so...

Establishment of geochemical background and threshold values of potentially toxic еlements is essential for soil management activities. Available topsoil data collected in the Bulgarian soil quality monitoring network are explored for the concentrations of the potentially toxic elements (PTEs) of As, Cd, Cr, Cu, Hg, Ni, Pb and Zn. The ‘median + 2MA...

Organic matter in soil, its content, composition and morphology are important diagnostic features, which are valuable information on the study of soils and soil processes. Information on humus state is base for studies on soil genesis, soil monitoring and in developing strategies for agriculture, soil conservation and fertility, and sustainable lan...

The present study is related to monitoring areas polluted from mining industry over lands with intensive agriculture in the area of Chavdar village. The study area of the survey is localized in the north part of village Chavdar, the watershed of Topolnitsa River in the east, close to the tailing pond. It provides information about chemical and agro...

Purpose The application of different humic products for the treatment of soils and plants has increased in recent years. The characteristics of humic products, such as the content and composition of organic carbon and the maturity, provide valuable information which is essential for an adequate application. Such information is crucial for manufactu...

The Northwestern region of Bulgaria is considered the poorest and most depopulated part of the Republic of Bulgaria. An observation and control system has been selected for an extended study of environmental interactions in the area. In our research we use modern GIS-oriented monitoring networks, to assess the physico-chemical state of the soil in...

The soil monitoring program has been implemented in Bulgaria since 2004. It complies with the latest requirements of the European Commission, the European Environment Agency and best practices in several European countries. The national legislation adopted the Soil Act and the Soil Monitoring Ordinance in 2007-2009 as a consequence. The monitoring...

The aim of the study was to characterize humus system of natural and artificial products. Humus systems from leonardite, lignite biotransformed with Trichoderma sp. (Plantagra), plant materials after pyrolisis (charcoal) and composts are compared. Humus systems are characterized by Kononova-Belchikova's method, and heavy metals content was measured...

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...

The content and availability of Pb, Cu and Zn were determined by the methods of soil extractions with aqua regia, 1 M NH4NO3 and 1 M NH4Ac. Reclaimed soils, which differ in land use, the duration of post reclamation development, geological and geographical characteristics were studied. In most pedons trace elements total contents are irregular alon...

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...

This publication aims to describe the key pedolithogenius characteristics and ecological functions of technogenic soils (Technosols), containing sulphide minerals considering the plant diversity, soils’ redox environment, varying geochemical contents of copper and zinc and duration of post reclamation development of soil pedons.The results show tha...