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Valchovski H.I.,Institute Of Soil Science N Pushkarov
Zootaxa | Year: 2012

Little is known about the diversity, ecology, distribution and habitats of earthworm populations in Bulgaria. In the present study an attempt has been made to collect all scientific works on earthworm species (Lumbricidae) of Bulgaria. The complete list of earthworm taxa of Bulgaria comprises 50 species and subspecies of Lumbricidae, belonging to 15 genera. For the first time, comprehensive information on distribution and habitats of all lumbricids in the country is given. The paper is useful for further monitoring studies of earthworm diversity and abundance in relation to environmental issues, land use and climate change. Copyright © 2012 Magnolia Press. Source


Vasileva V.,Institute of Forage Crops | Kostov O.,Institute Of Soil Science N Pushkarov | Vasilev E.,Institute of Forage Crops | Athar M.,288 Meadowview Road
Pakistan Journal of Botany | Year: 2011

Utility of lucerne crop fertilization with nitrogen fertilizer has been discussed in literature with controversy. In this study experiment was conducted to determine the effect of mineral nitrogen at the doses of 40, 80, 120 and 160 mg N/kg on some characteristics of lucerne under induced water deficiency stress at the stage of budding in a pot trial. It was found that mineral nitrogen at the doses of 120 and 160 mg N/kg soil increased the productivity of dry top mass by 17 and 23% in conditions of optimum moisture, and by 9% in conditions of water deficiency stress at the dose of 80 mg N/kg soil. Application of mineral nitrogen at the dose of 120 and 160 mg N/kg soil increased the quantity of dry root mass by 43 and 38% for the conditions of optimum moisture, and by 54-56% for conditions of water deficiency stress. Mineral nitrogen fertilizing at the dose of 40 mg N/kg soil had the lowest suppressive effect on the nodulation (11%). The dose of 160 mg N/kg soil was found to be toxic to nodulation. The dose of 80 mg N/kg soil, at which the crop had the lowest sensitivity to water deficiency stress, was optimal for lucerne development. Source

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