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Published in Scientific Papers. Series B, Horticulture, Vol. LXIV, Issue 1
Written by Kostadin KOSTADINOV, Radoslav CHIPILSKI, Stoyan FILIPOV

During the vegetation period of the year 2019 on experimental field at Agricultural University - Plovdiv it was conducted a physiological study of tomato cultivar (Rugby) with determined growth under the treatment with chemical and organic fertilizers. The purpose of this research was to examine changes of the functional activity of the plant photosynthetic apparatus of variants with different fertilization and different planting dates. It was determined more optimal ratio between photosynthetic active radiation (PAR) and quantum yield (qY-Fv/Fm) of the photosystem II (PS II) in dark-adapted leaves for organic and chemical fertilized variants, compared to no fertilized variant. Minimal fluorescence (Fo) in reaction centers of PS II after dark-adapted of leaves was with highest value at chemically fertilized variant, which means that it did not affect the photosynthetic activity. Significant differences were observed for values of chlorophyll content index (CCI) in the different variants, as most stable average result showed organic fertilized variant for three differing planting dates on experimental field.

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