Reducing mineral fertilizers with microizate bacteria and microalg in water culture lettuce growing

In this thesis, the aim is to reduce the amount of mineral fertilizer in half in the greenhouse cultivation of curly lettuce in the greenhouse. When mineral fertilizers were reduced by 50%, plant growth, yield and product quality did not decrease, due to the bio-fertilizers. Micromikroalgae, bacteria and mycorrhiza bio-fertilizers were used in the study. Bacteria (Rhizofill) and mycorrhiza (Endo Root Soluble) are selected from commercial products with easy-to-find bio-fertilizers. Micromikroalgae Chlorella vulgaris produced by Cukurova University Faculty of Fisheries was used for mikroalgae application. Completion of bio-fertilizers instead of reduced mineral fertilizers was examined in terms of plant growth, yield, product quality and plant nutrition. Lettuce yield was statistically different compared to the applications. The highest yield was obtained from the control group, which was 100% mineral fertilization with 16.51 kg / m2, followed by 50% Nutrient + Bacteria with 16.24 kg / m2, and these two were statistically in the same group. Mikroalgae applications come with 13.87 kg / m2 mycorrhiza and 13.08 kg / m2 in the next 3rd and 4th row yield. When mineral fertilizers were reduced by 50% and bacteria, mycorrhiza and micromikroalgae bio-fertilizers were added instead, yield per unit area increased by 42%, 20% and 13.6%, respectively, compared to 50% fertilizer. Bio-fertilizer applications in parameters such as plant height, circumference, lettuce weight, leaf area, dry matter ratio, number of leaves have always shown higher values than the application using only 50% mineral fertilizer. It can be said that the bacteria comes to the fore in terms of plant development in bio-fertilizers, followed by mycorrhiza. While the highest vitamin C was taken from the application of bacteria, mycorrhiza and mikroalgae applications were followed, respectively. The nitrate amounts in the lettuce leaves in the experiment were recorded at the highest in bacteria bio-fertiliser. This may indicate that nitrogen of the air can be bound as nitrate in the Bacterial bio-fertilizer because it is even more than the nitrate contained in 100% Nutrient application. The nitrate amounts in the lettuce obtained in this thesis work are well below the limit values allowed by the Turkish Food Codex and are not dangerous for human health.