Published in Scientific Papers. Series B, Horticulture, Vol. LXVIV, Issue 1
Written by Dimitar DIMITROV, Kostadin KOSTADINOV, Stoyan FILIPOV
The amounts of carbon emissions during the cultivation of lettuce in greenhouse conditions during the autumn-winter period were measured in a polyethylene greenhouse. Fertilised and unfertilised soils, with and without plants, were placed in hermetically sealed chambers for 24 hours under identical conditions, after which the quantitative content of CO2 in each chamber was determined. The impact of mineral and biological fertilizers on greenhouse gas emissions was studied. To assess the contribution of soil microflora to carbon emissions in the gas chambers, a comparison was made between the CO2 levels measured in the unfertilised and fertilized soil variants, as well as between soils with and without plants. Model calculations were performed for the absorbed CO2 gas over a relatively equal period in each of the three research years for NPK-fertilized, biologically fertilized, and unfertilized lettuce cultivation variants. It was found that mineral fertilization when cultivating salads in greenhouse production conditions, in norms N12.5P4.17K15.83 and has lower emissions - as a share in greenhouse gases (in the amount of 90.74 g/m2) compared to unfertilized and fertilized with organic plants.
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