M. MIHOV and I. TRINGOVSKA
Maritsa Vegetable Crops Research Institute, BG - 4003 Plovdiv, Bulgaria
MIHOV, M. and I. TRINGOVSKA, 2010. Energy efficiency improvement of greenhouse tomato production by applying new biofertilizers. Bulg. J. Agric. Sci., 16: 454-458
Greenhouse tomato production in Bulgaria is extremely energy intensive; therefore the majority of producers grow tomatoes in greenhouses without heating. The aim of the research was to improve the tomato production energy effectiveness by using new technology conventional fertilization based on soil analysis and novel biofertilizers instead of manure. Two biofertilizers were used bacterial fertilizer BioLife (USA) and mycorrhizal inoculum Media Mix (USA). The application of biofertilizers to improve soil fertility combined with optimized use of synthetic fertilizers can increase the energy output with the yield which leads to an increased energy output-input ratio to 1.19 and 1.11 respectively. The energy output with the yield exceeds the energy inputs and energy gains of 19.45 GJ.ha-1 and 11.40 GJ.ha-1 are achieved. The results show that the total energy output (90.52 GJ.ha-1) increased by 32.0% when BioLife was used and by 22.9% when Media Mix was used. Bacterial fertilizer, mycorrhizal inoculum and tomato fruits energy equivalents of 0.01 MJ.kg-1, 14.5 MJ.kg-1and 1.2 MJ.kg-1 respectively have been established to allow an energy assessment of tomato production.