TY  - JOUR
T1  - Evaluation of Growth, Yield and Energy Requirements of Hydroponic ‘Green Oak’
Lettuce under Led Light with High Plants Density Condition
AU - Watjanatepin, Napat 
JO  - Journal of Engineering and Applied Sciences
VL  - 14
IS  - 18
SP  - 6601
EP  - 6609
PY  - 2019
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2019.6601.6609
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2019.6601.6609
KW  - yield
KW  -start-up cost
KW  -LED light
KW  -hydroponic greenhouse
KW  -high plant’s density
KW  -energy consumption
KW  -start-up cost
KW  -yield
AB  - The Hydroponic System (HS) has obtained the soilless technology can produce more than 10 crops
of leafy vegetable with rapid growth, high yield and superior quality. The aim of this study is to identify and
monitor the hydroponic "Green Oak" lettuce growth development and yield under LED supplement and to
evaluate the start-up cost and energy consumption of the hydroponic system with LED light. The
NFT-hydroponic and commercial nutrient solution under high plant’s density condition and three difference
of LED array was applied. Plant yield and energy consumption were evaluated by the method of Poulet and
Barbosa. The results show that the hydroponic "Green-Oak" lettuce under LED R70+B30 indicated the highest
yield. The start-up cost of HS-LED is about 220 USD/m<sup>2</sup>. The energy per unit of total biomass is 0.038 kWh/g
and the power density of the proposed LED lighting in average is 0.22 kW/m<sup>2</sup>. It is possible to apply LED
lighting for hydroponic greenhouse in the high plant&#146;s density which could produce a high yield and a good
quality of the lettuce. The LED light array consumed the largest number of energy, for energy sustainability,
the LED needs to be switched to low power consumption types and a new design for the LED light source
should be applied. The results from this study could be applied to design for the effective of HS-LED
in the next step.
ER  -