Premium
Influence of Daily Carbon Dioxide Exposure Duration and Root Environment on Soybean Response to Elevated Carbon Dioxide
Author(s) -
Heagle A. S.,
Booker F. L.,
Miller J. E.,
Pursley W. A.,
Stefanski L. A.
Publication year - 1999
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1999.00472425002800020034x
Subject(s) - carbon dioxide , yield (engineering) , photosynthesis , horticulture , carbon dioxide in earth's atmosphere , zoology , chemistry , agronomy , botany , biology , materials science , organic chemistry , metallurgy
Little is known about effects of daily CO 2 enrichment duration and root environment on plant response to elevated CO 2 . Two experiments were performed with Essex soybean ( Glycine max L. Merr.) in open‐top field chambers to address these questions. In one experiment, effects of 12 and 24 h d −1 exposures to double‐ambient CO 2 were compared for plants grown in 14 L pots that were either insulated to moderate soil temperature or not insulated. Although never significant statistically, trends at some growth stages suggested that nighttime CO 2 enrichment contributed to growth and yield. Plants grew and yielded more in insulated than noninsulated pots, but there were no significant CO 2 enrichment × insulation interactions. In the second experiment, response to approximately 1.3, 1.6, and 1.9 times ambient CO 2 was compared for plants grown in the ground or 14 L pots. Enhancement of photosynthesis, growth, and yield by CO 2 enrichment was similar in pots and in the ground. Linear responses to different CO 2 concentrations were significant for all yield components in both root environments, whereas quadratic responses were significant for plants in pots but not for plants in the ground. Tests of proportionality of response for yield components showed no evidence of significant differences between plants in pots and in the ground except weight per 100 seeds. Seed yield enhancement at 1.9 times ambient CO 2 was 36% for plants in pots and 33% for plants in the ground. Overall, proportional response of soybean to CO 2 enrichment was relatively uniform in spite of large differences in baseline growth and yield.