Abstract
The supplementation of blue light to red light enhanced plant growth compared with the use of red alone. The aim of thestudy was to determine the effect of different doses of blue light on the biometric traits and photosynthesis of dill plants. Theplants were grown in pots in a growth chamber. They were grown in red light (100 μmol m-2 s-1) and blue light (from 10 to 50μmol m-2 s-1) in five combinations. Light emitting diode modules were the source of light. The plants were evaluated every 7days during vegetation, for the first time - seven days after germination and later on the 14th, 21st and 28th day aftergermination. The share of blue light in the spectrum significantly influenced the biometric traits of the dill plants. Itsignificantly inhibited the elongation growth of the plants and negatively affected the increase in fresh weight. A small dose ofblue light (20%) had positive effect on the plants’ area. The research did not reveal a simple relationship between the amountof blue light and dry weight yield. The value of physiological indexes depended both on the combination and measurementtime. The plants from the combination with 30% blue light were characterised by the greatest photosynthesis intensity. Aneffective share of blue light in the spectrum may range from 10 to 30% in relation to red light and depends on the plant’sdevelopment phase and on the result we want to achieve in the cultivation of plants.
Highlights
Spice plants grown and sold in containers tend to have excessively elongated hypocotyl at the initial period of cultivation due to their high density and usually insufficient amount of light
Plant growth and morphogenesis are strongly influenced by the light spectrum and both yield and crop quality could be improved by controlling light quality (Whitelam and Halliday, 2007)
The highest dry weight yield in the last week of measurements was observed in the combination with 40% blue light
Summary
Spice plants grown and sold in containers tend to have excessively elongated hypocotyl at the initial period of cultivation due to their high density and usually insufficient amount of light. This situation results in worse quality of plants for sale (Callan et al, 2007). Plant growth and morphogenesis are strongly influenced by the light spectrum and both yield and crop quality could be improved by controlling light quality (Whitelam and Halliday, 2007). According to Hälvä et al (1992b), red light increased dill plant growth and induced the elongation of internodes. Blue light-treated plants had shorter internodes and produced relatively high herb yields
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