Published in Scientific Papers. Series B, Horticulture, Vol. LXVIV, Issue 2
Written by Dimitar DIMITROV, Stoyan FILIPOV, Kostadin KOSTADINOV
To determine the amount of greenhouse gases during the period 2021-2024, an experiment was set up with spinach under greenhouse conditions. The following options were tested: 1. spinach chamber without fertilization - control; 2. spinach chamber with mineral fertilization - NPK; 3. spinach chamber with organic fertilization - Vitaorganic; 4. Chamber without lettuce and without fertilization. At each reading, the CO2 concentration was additionally measured outdoors and in the polyethylene greenhouse. Readings were carried out weekly from planting to harvesting - from January to April. Under adverse weather conditions, young plants fertilized with organic fertilizer consume less CO2, compared to that released from the soil and available in the atmosphere. As temperatures rise, they begin to consume increasingly larger amounts, with the maximum at the end of February, after which consumption decreases to on March 28. The mineral fertilization option has a higher degree of CO2 fixation compared to organic fertilization. When entering economic maturity, the CO2 fixation values are highest for mineral fertilization, while with organic fertilization the fixation is less.
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