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Tsvetkov I.,AgroBioInstitute | Dzhambazova T.,AgroBioInstitute | Batchvarova R.,AgroBioInstitute | Markov E.,Institute of Soil Science Nikola Poushkarov | And 4 more authors.
Acta Horticulturae

We compared the effect of biotisation techniques on growth and mineral uptake in nursery-grown micropropagated Myrobolan 29C plants, against conventional techniques. Biotisation techniques consisted of inoculation of mycorrhizas (Glomus intraradices) and bioagents (Trichoderma harzianum), moreover, the soil borne pathogens were controlled through antagonist microorganisms. Nutrients (N, P, K) were supplied based on plant demand for biotised plants whilst they were empirically supplied for the conventionally managed block. Biotised plants showed a double growth (total dry matter) compared to control plants (34 g/plant against 18 g/plant) despite a significant reduction of the amounts of nutrients supplied. A fertigation plan is proposed to reduce undue mineral elements application by matching the plant demand for nutrients. Source

Agency: Cordis | Branch: FP7 | Program: CP-IP | Phase: ENV.2009. | Award Amount: 9.16M | Year: 2009

SoilTrEC proposes to develop an integrated model of soil processes that describes key soil functions. These functions are defined in the EC Soil Thematic Strategy as essential ecosystem services for the well-being and economic success of the EU. The key science advances are to develop, from first-principles, computational models that integrate soil erosion, solute transport, carbon dynamics and food web dynamics within an open-source modelling framework. This framework will provide the platform, together with existing GIS capacity, for a prototype simulator at EU-scale to assess soil threats and evaluate approaches to mitigation. This physical-based modelling will be integrated with new advances in decision support developed from life cycle and economic assessment methodologies for natural resources. A key conceptual advance of this project is to quantify soil stocks, their formation, loss and functions within the context of the earths Critical Zone. This encompasses the terrestrial environment from the top of the biospheres tree canopy to the bedrock delineating the lower bounds of freshwater aquifers. SoilTrEC will link 4 EU field sites that describe key stages within the life cycle of soil formation, its productive use and degradation. Existing data sets will be augmented with targeted process studies in order to provide the data sets to validate the integrated model of soil processes. These process studies will be integrated with results from additional EU, USA and Chinese field sites to compare soil processes and rates as they vary with lithology, climate and land use. These sites and their teams will be integrated through shared results and an international research training programme into a global network of Critical Zone Observatories. This programme of research will engage very actively with stakeholders involved in the practical management of land, and will draw strongly on the advice and guidance of international leaders in soil sustainability.

Hristozova M.,Military Medical Academy | Denkova D.,Bulgarian Academy of Science | Yordanova I.,Institute of Soil Science Nikola Poushkarov | Rangelov V.,Military Medical Academy | Alyakov M.,Military Medical Academy
International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM

Antarctica is the least-studied region of the earth. The aim of the study is to determine the concentrations of natural and artificial radio nuclides in the soil, their transmission in terrestrial plants.and its major role in understanding the behavior of radioisotopes in an ecosystem. Antarctic has not suffered a direct action of human activities that released radioactive elements. The global fallout are the main cause for the presence of artificial radionuclides present in this environment and the registered levels of 137Cs in this study indicate this. The concentration and activity of Cesium-137 in the soil as in mosses, lichens and samples from volcanic ash have been estimated. The results for 137Cs and 90Sr activity in soils were compared and discussed. © SGEM2015. Source

Kercheva M.,Institute of Soil Science Nikola Poushkarov | Rousseva S.,Institute of Soil Science Nikola Poushkarov | Dimitrov E.,Institute of Soil Science Nikola Poushkarov | Nenov M.,Institute of Soil Science Nikola Poushkarov | Shishkov T.,Institute of Soil Science Nikola Poushkarov
Applied Geochemistry

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 stable aggregates at particular depths can be explained by certain vertical heterogeneity of the soil profiles in space. The water stable aggregates in 1-3. mm size dry aggregates in the upper layer vary from 44% to 76% under native vegetation, drop to 1% under intensive cultivation, and comprise 19% in land not tilled for 5. years. The results allow linking the characteristics of soil structure with other biotic and chemical properties for better estimation of the driving forces for soil aggregate formation. © 2011 Elsevier Ltd. Source

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