Published in Scientific Papers. Series B, Horticulture, Vol. LXVI, Issue 1
Written by Plamena YANKOVA, Hriska BOTEVA
The purpose of the study is optimization of fertilization with the greenhouse tomatoes. The experimental work has been brought out during the period 2018-2019, in the test field of department “Plant Production” in a polyethylene greenhouse, without heating, with two varieties tomatoes - Grando F1 and Pink Rok F1, grown as a soil crop. Three schemes of fertilization have been tested with five formulations fertilizers for fertigation: brought in as main fertilization /control/ and a combined scheme: fertilization in seven and three days during the vegetation on the increase rate of the vegetative mass and productivity of the plants. The results from the tested fertilization schemes show a positive effect on the growth and productive manifestations with both tomato varieties in comparison with the control. It is statistically proven that the impact is bigger with the combined fertilization by YaraTera Kristalon Special (18-18-18); YaraTera Kristalon Lazur (20-05-10); YaraTera Kristalon Orange (6-12-36); YaraTera Kristaflex Yellow 12-32-11 and YaraLiva Calcinit, brought in in 3 days, in comparison with the fertilization in 7 days, which is expressed stronger for variety Grando F1. The results about the number and mass of the fruit per plant are analogous. By the analysis carried out on the averaged data is established that variety Grando F1 exceeds as per productivity variety Pink rok F1 by 11.1% (fertilization in 3 days) and 4.8% (fertilization in 7 days), as the differences are mathematically proven.
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