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Effects of Light Intensity and Carbon Dioxide Concentration on Photosynthetic Rate of Soybean 1
Author(s) -
Brun W. A.,
Cooper R. L.
Publication year - 1967
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1967.0011183x000700050013x
Subject(s) - photosynthesis , light intensity , carbon dioxide , botany , biology , horticulture , ecology , physics , optics
Photosynthetic response curves to CO 2 concentration and light intensity were determined for the soybean varieties ‘Hark’ and ‘Chippewa‐64’. At light intensities above 5,380 lux, the photosynthetic rates of both varieties were limited by the CO 2 concentration of the surrounding atmosphere within the range investigated (270 to 1670 ppm). At normal atmospheric CO 2 concentration (300 ppm), photosynthesis of both varieties was light saturated at about 21,530 lux. At a CO 2 concentration of 1670 ppm, photosynthesis was not light saturated in either variety at the highest light intensity tested (75,350 lux). The photosynthetic rate of the variety Hark was higher than that of the variety Chippewa‐64 at 45 of the 48 combinations of light intensity and CO2 concentration tested.