Research was conducted by DSc ( habilitation ) Agata Jędrzejuk from the Department of Ornamental Plants of the Warsaw University of Life Science in Warsaw , Poland , to study the effects of LED light on Petunia cross Dark Red .
The test material were rooted cuttings of petunia ( Petunia x atkinsiana ) “ Dark Red ” , institute on 16th of April in pots P11 in standard peat substrate . The experiment was continue until 28th of June 2019 . The plants , leveled in height and quality , were separated into 4 combination and place in a grow elbow room in a constant temperature of 20 ° light speed . In each combination 15 plants were set . The espouse parameter were measured in 6 periods ( from 16th of April to 28th o June ): height of plant , bit and control surface area of leaf , number and diameter of flowers , diameter of plant . The germ of igniter consisted of light-emitting diode lamp by Plantalux . The solvent were compiled statistically using one - way ANOVA1 , and the means were compared using LSD test at P=0.95 .
Results
ontogeny dynamicsPlants growing in weather condition of greater participation of violent visible light ( combination 3 ) were characterize by the gamy development charge per unit . The shortest plants were from compounding 1 and 2 , which height was no great than 13 cm during the last daylight of the experimentation .
Number of shootsThe most shoot had the plants turn in conditions of bully engagement of crimson sparkle as well as a mix of blue and red lights ( compounding 3 and 4 ) . The phone number of shoots from these combinations during the last day of experiment equalize on average 22 and 23,40 .
aerofoil field of a leafPlants growing in atmospheric condition of greater participation of white visible light and blue light had definitely big leaves than plants grow under ruby-red light and a mixture of cherry-red and blue lights , on all dates of measurement . The leaves of petunia grow in conditions of greater participation of reddish Light Within had the smallest leaves and their surface area has been decreasing with each surpass date of mensuration .
Number of flowersThe greatest number of flowers since the 2d date of measure ( 25th of April ) had the plant grow in condition of greater participation of cherry-red light . On the last date of measurement ( 28th of June ) the number of flowers from this combination equaled 65.8 per industrial plant .
Diameter of a flowerFrom 25th of April to 11th of June plants growing in condition of greater involvement of ruby light as well as a mix of aristocratical and red lights had on average large diam of flowers that plants produce in consideration of greater participation of puritanical brightness .
Diameter of plantsThe measurements of the diam of plant have been need from 8th of May to 28th of June . plant growing in conditions of with child participation of red sparkle were characterized by the big diameter of plants on all dates of measurements . On the last day the diameter of above - observe plants reached on mean 50 curium . The smallest diam reached the plant life from the control group ( 100 % blank light participation ) – 43.9 cm .
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