Published in Scientific Papers. Series B, Horticulture, Vol. LXV, Issue 1
Written by Desislava SLAVCHEVA-SIRAKOVА, Kostadin KOSTADINOV, Stoyan FILIPOV, Nadezhda SHOPOVA
This paper presents the results of an experiment related to cultivation of red-leaf lettuce type 'Lollo rosso’ variety ʻTuskaʼ outdoors, in transition to organic production. The experiment has been conducted in field conditions on the premises of the Agricultural University in the region of Plovdiv. During the lettuce growth several variants were tested: 1. NPK (mineral fertilization); 2. Control (non-fertilization); 3. Italpollina; 4. Arkobaleno; 5. LC (Lumbricompost); and 6. Ekoprop NX. The effect of the different organic fertilizers has been studied through the main biometrical parameters. Statistically significant differences have been reported for the most important indicators - fresh mass weight g and number of leaves with highest values observed in variants 6. Ekoprop NX and 4. Arkobaleno. Organic fertilization successfully replaces the fertilization with a combined fertilizer (NPK) under the different hydrothermal conditions of the experimental period.
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