Far-red LEDs improve fruit production in greenhouse tomato grown under high-pressure sodium lighting

Citation

Hao, X.M., Little, C., Zheng, J.M., et Tsao, R. 2016. « Far Red LED Improved Fruit Production in Greenhouse Tomato Grown under High Pressure Sodium Lighting. », Acta Horticulturae (ISHS)1134:95-102.

Résumé en langage clair

A study was conducted from November 2014 to April 2015 in a greenhouse (192
m2 growing area) to investigate the effects of far-red LED light on plant growth, fruit
yield and quality of greenhouse tomato (Solanum lycopersicum). Twin-head (stem)
transplants of tomato cultivar ‘Foronti’ grafted on rootstock cultivar ‘Stallone’ were
planted into six twin-rows at 2.8 stems m-2 in the greenhouse in late November The
two outside twin-rows were used as the guard row while the four middle twin-rows
were divided into 16 experimental plots (24 stems per plot). Four far-red LED
treatments which provided 0 (control), 8, 16, and 24 μmol m-2 s-1 of far-red photon
flux were applied to the 16 plots in a Latin-square design with 4 replications.
Overhead high-pressure sodium (HPS) lamps provided 165 μmol m-2 s-1 of light to all
the plots in the greenhouse. The application of far red light and overhead HPS
supplement light was started in early December with a consistent photoperiod of 16 h
(1:00 to 17:00 HRS). Both lighting systems were automatically shut-off when outside
global solar radiation was >300 W m-2. All 3 far-red light treatments increased the
stem length in the early but not in the late stage of the greenhouse trial. Fruit yield in
the first month of fruit harvest was increased by all three far-red treatments.
However, the increase diminished in the second and third month of fruit harvest. The
fruit harvested from the plants exposed to far-red light also had higher carotenoid
content. Therefore, this study showed the beneficial effects of low dose of far red
light in early stage of fruit production of greenhouse tomatoes grown under HPS
lighting.

Résumé

A study was conducted from November 2014 to April 2015 in a greenhouse (192 m2 growing area) to investigate the effects of far-red LED light on plant growth, fruit yield and quality of greenhouse tomato (Solanum lycopersicum). Twin-head (stem) transplants of tomato cultivar 'Foronti' grafted on rootstock cultivar 'Stallone' were planted into six twin-rows at 2.8 stems m-2 in the greenhouse in late November The two outside twin-rows were used as the guard row while the four middle twin-rows were divided into 16 experimental plots (24 stems per plot). Four far-red LED treatments which provided 0 (control), 8, 16, and 24 μmol m-2 s-1 of far-red photon flux were applied to the 16 plots in a Latin-square design with 4 replications. Overhead high-pressure sodium (HPS) lamps provided 165 μmol m-2 s-1 of PAR to all the plots in the greenhouse. The application of far red light and overhead HPS supplement light was started in early December with a consistent photoperiod of 16 h (1:00 to 17:00 HRS). Both lighting systems were automatically shut-off when outside global solar radiation was >300 W m-2. All 3 far-red light treatments increased the stem length in the early but not in the late stage of the greenhouse trial. Fruit yield in the first month of fruit harvest was increased by all three far-red treatments. However, the increase diminished in the second and third month of fruit harvest. The fruit harvested from the plants exposed to far-red light also had higher carotenoid content. Therefore, this study showed some beneficial effects of low dose of far red light in early stage of fruit production of greenhouse tomatoes grown under HPS lighting.

Date de publication

2016-05-22

Profils d'auteurs