Productivity and Physiological Response of Four Hybrid Poplar Clones Grown on Different Type of Substrate
Productivity and Physiological Response of Four Hybrid Poplar Clones Grown on Different Type of Substrate

Author(s): Maria Glushkova, Svetoslav Anev
Subject(s): Economy, Geography, Regional studies, Energy and Environmental Studies, Environmental Geography
Published by: Национално издателство за образование и наука „Аз-буки“
Keywords: hybrid poplars; growth; productivity; photosynthesis; water use efficiency
Summary/Abstract: In order to reveal the productivity and physiological response of different poplar clones 200 cuttings of 4 hybrid poplar clones – “BL”, “Agathe”, “45/51” and “37/61” were set in rooting containers in 2 variants of cultivation - soil substrate and compost. The necessary growing activities for the poplar saplings were taken during the growing season, including watering and treatment against pathogens and insect pests. The growing parameters - height and diameter of the seedlings of 1-year-old seedlings were measured and the differences between poplar clones were reported. The rate of light-saturated photosynthesis and transpiration rate were measured with a portable infrared gas analyser Li-6400 and water use efficiency was calculated. The effect of genotype (clone) and substrate on the health status, growth in height and diameter and the physiological indicators - intensity of photosynthesis, intensity of transpiration and water use efficiency were studied. The results of the study showed the presence of significant clone differences of the studied functional parameters pertained to the growth and productivity of the studied four hybrid poplar clones at a young age. Poplar clone “BL” was found to show the best growth characteristics compared to the others at the age of seedlings one year. The growing substrate has also a significant effect on the variability of growth and physiological parameters among different poplar clones.

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