Please use this identifier to cite or link to this item: http://hdl.handle.net/10497/17654
Title: Integrated effects of root-zone temperatures and phosphorus levels on aeroponically-grown lettuce (Lactuca sativa L.) in the tropics
Authors: Luo, Hong Yi
Lee, Sing Kong
He, Jie
Issue Date: 2009
Citation: Luo, H. Y., Lee, S. K., & He, J. (2009). Integrated effects of root-zone temperatures and phosphorus levels on aeroponically-grown lettuce (Lactuca sativa L.) in the tropics. The Open Horticulture Journal, 2, 6-12. http://dx.doi.org/10.2174/1874840600902010006
Abstract: In this study, butterhead lettuce (Lactuca sativa L. cv. Baby Butter) plants were grown at three root-zone temperatures (RZTs): 25°C, 30°C and ambient-RZT (A-RZT) ranging from 26°C-42°C while their shoots were maintained at hot ambient temperature ranging from 26°C-42°C. Three phosphorus (P) concentrations: -25% P (minus P, 23.25ppm), control (31.00ppm) and +25% P (plus P, 38.75ppm) were supplied to the plants at each RZT using Netherlands Standard Nutrient Solution. Interactions between RZT and P concentrations on productivity, root morphology, maximum photosynthetic O2 evolution (Pmax), P uptake and its partitioning between shoot and root were studied. Lettuce plants grown with the plus P concentration at 25°C-RZT had the highest productivity, highest Pmax, highest shoot and root P concentrations. However, all the root morphological parameters studied were the greatest in plants grown with the minus P at 25°C-RZT. Higher P concentration in the solution and 25°C-RZT resulted in higher portion of the absorbed P partitioned to the shoots. Integrated effects of RZT and P concentration on the productivity, root morphology, photosynthesis and P uptake were discussed.
URI: http://hdl.handle.net/10497/17654
ISSN: 1874-8406
Other Identifiers: 10.2174/1874840600902010006
Website: http://dx.doi.org/10.2174/1874840600902010006
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