The effect of illumination on the physiological parameters of greenhouse grown tomatoes | Apgaismojuma ietekme uz siltumnīcā audzētu tomātu fizioloģiskajiem parametriem
2019
Sergejeva, D., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture. Inst. of Soil and Plant Sciences | Simtniece, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture. Inst. of Soil and Plant Sciences | Reinsons, R., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture. Inst. of Soil and Plant Sciences | Badaukis, N., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture. Inst. of Soil and Plant Sciences | Kalnins, E. [and three others], Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture. Inst. of Soil and Plant Sciences
Light is one of the most important factors affecting plant growth, development, yield and its quality. The trial was arranged at the Polycarbonate Greenhouse of the Institute of Soil and Plant Sciences of the Latvia University of Life Sciences and Technologies in the autumn of 2018. Tomatoes were grown under LED, induction and high pressure sodium lamps with 16 h photoperiod, light intensity at the tomatoes tops were 100 µmol mE−2 sE−1. Tomato varieties 'Encore' F1, 'Diamantino' F1, 'Bolzano' F1 and 'Chocomate' F1 grafted on the 'Maxifort' rootstock were used in the trial. The intensity of plant transpiration and water retention were determined. Non-destructive methods have been used to evaluate chlorophyll fluorescence parameters (Fv/Fm, Fv/F0, PI) with OS5p + fluorometer and indices CRI500 (carotene content), NDVI (chlorophyll content), SIPI (content of various pigments), GI (Chlorophyll Content), PSRI (Plant Aging) were determined by the RS-3500 spectro-radiometer based on the spectra of reflection of tomato leaves. The most intensive transpiration for all analysed tomato varieties was found under LED lighting. The highest transpiration intensity under the LED illumination was found in 'Bolzano' F1. The lower water retention capability was also below the LED illumination, but the highest below the high pressure sodium lamps. Fv/Fm and Fv/F0 values show that plants are best suited for LED and induction lamp lighting, but interactions between variety and lighting are essential.
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