Solar energy conversion efficiency and growth aspects of the duckweed, Spirodela punctata (G.F.W. Mey.) Thompson

Document Type

Article

Publication Date

1-1-1984

Abstract

Duckweed, Spirodela punctata (G.F.W. Mey) Thompson, was grown on cattle manure dilutions in small outdoor tanks, under different environmental conditions, during the autumn of 1979 and the spring of 1980. Daily growth rates and solar energy conversion (photosynthetic) efficiencies of duckweed were similar for plants grown on manure dilutions of 2.5, 5.0 and 10.0 gl-1. There were no significant differences in the daily growth rate or efficiency of photosynthesis for growth periods of 1-4 days. The maximum mean growth rate and solar energy conversion efficiency observed were 12.7 g m-2 day-1 and 4.2% of the photosynthetically active radiation (PAR). The highest values obtained for a single sample were 19 g m-2 day-1 and 4.9%. In terms of dry organic matter production, duckweed was observed to grow as much, or more, during the night as during the day. The source of energy for night growth was not determined. Percent moisture of the duckweed was less at high air temperatures than at low temperatures. Insolation was not significantly related to percent moisture. Percent ash remained relatively constant for all levels of temperature and insolation. © 1984.

Publication Source (Journal or Book title)

Aquatic Botany

First Page

157

Last Page

170

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