Institute Of Soil Science Agrotechnology And Plant Protection N Poushkarov

Sofia, Bulgaria

Institute Of Soil Science Agrotechnology And Plant Protection N Poushkarov

Sofia, Bulgaria
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Simeonova T.,Institute Of Soil Science Agrotechnology And Plant Protection N Poushkarov | Stoicheva D.,Institute Of Soil Science Agrotechnology And Plant Protection N Poushkarov | Koleva V.,Institute Of Soil Science Agrotechnology And Plant Protection N Poushkarov | Sokolowska Z.,Polish Academy of Sciences | Hajnos M.,Polish Academy of Sciences
International Agrophysics | Year: 2017

The study characterized the regime of nutrient leaching under different nitrogen and phosphorus supply of irrigated maize grown as monoculture on Fluvisol for the period 1999-2008 and additionally studied in the years 2009, 2010, and 2011. The aim of the study was to estimate the effect of longterm fertilizer application on the leaching of nutrients from the soil under maize grown as monoculture. The experiment design included four nitrogen fertilizer rates (B1-control, B5, B4, B3, B2) calculated to compensate 50, 75, 100, and 125% from the plant N uptake, respectively. The field plots were equipped with lysimeters (at 50 and 100 cm depth) for studying the relationship between the applied fertilizer rates and the nutrient concentrations in the lysimetric water. The greatest nitrogen concentration in lysimetric water was observed under variant (B3-N200 P150) throughout the study period and the highest N losses were registered (36 kg ha-1) in 2010 under the same treatment (B3). A very good correlation was found between the N rates, calcium, and magnesium losses. Lysimetric water component compensation shows that agricultural activities have only influenced the speed of weathering and had no significant effect on the rates. © 2017 by Tsetska Simeonova.


Kathijotes N.,Cyprus University of Technology | Petrova V.,Institute Of Soil Science Agrotechnology And Plant Protection N Poushkarov | Zlatareva E.,Institute Of Soil Science Agrotechnology And Plant Protection N Poushkarov | Kolchakov V.,Institute Of Soil Science Agrotechnology And Plant Protection N Poushkarov | And 2 more authors.
American Journal of Environmental Sciences | Year: 2015

The water-energy nexus reveals that large amounts of energy is stored in used water and can be used as an energy source. Anaerobic fermentation is an excellent ecological waste treatment and a way of producing low cost electrical and thermal energy. By using digestate resulting from biogas production instead of synthetic fertilizers derived from natural gas, we can save energy, cut consumption of fossil fuels and reduce our carbon footprint. The aim of this study then is to determine the effect of digestate on the yield and quality of crop production as well as its effect on the immediate environment. A ratio of raw materials in biogas, pig manure and vegetable wastes of 70:30 was used on lettuce as an indicator culture. The studies were carried out on two different soil types. Digestate was applied at various percentages, tested with untreated soil as control. The results are encouraging indicating that digestate as a biomass is rich in macro and micronutrients and can be used in agriculture for the improvement of soil fertility. © 2015 Nicholas Kathijotes, Vera Petrova, Elena Zlatareva Viktor Kolchakov, Svetla Marinova and Plamen Ivanov.

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