Effect of airflow and carbon dioxide on growth, yield, and gas exchange of lettuce

Romaine lettuce (Lactuca sativa var. longifolia L.) was grown hydroponically inside a walk-in growth chamber (Conviron, PGW36) with two levels of airflow (0.36 and 2.50 m$\rm\cdot s\sp{-1})$ at different atmospheric CO$\sb2$ concentrations (350 and 700 \rmμ mol\cdot mol\sp{-1}). A combination of metal-halide and high-pressure sodium lamps was used to provide 30 mol$\rm\cdot m\sp{-2}$ photosynthetic photon flux (PPF) per day with a 12-hour photoperiod at the rate of 660 \rmμ mol\cdot m\sp{-2}\cdot s\sp{-1}. Air temperature was maintained at 22$\sp\circ$C and relative humidity at 70% for both day and night. Nutrient solution pH was kept at 5.7 with nitrate as the sole nitrogen source. Growth analysis was carried out at 3-day intervals and gas exchange rate of both single-leaf and whole-plant was measured with a modified portable photosynthesis system (LI-COR, LI-6200 PPS). A microcomputer-based data acquisition and process control system was developed to maintain CO$\sb2$ concentration and monitor environmental condition in each of the four runs of this experiment.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Crop Sciences

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Chen, Guang-Yau Stanley

Contributors dc:contributor

• Spomer, L. Art

• Agriculture, Agronomy
• Biology, Plant Physiology

Statement dc:rights

• Copyright 1996 Chen, Guang-Yau Stanley

Language dc:language

eng

Identifier

9780591471984
AAI9737070
(UMI)AAI9737070

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/21203