Soybean dry matter allocation under subambient and superambient levels of carbon dioxide

Journal Article · · Agronomy Journal; (United States)

DOI:https://doi.org/10.2134/agronj1991.00021962008300050020x· OSTI ID:6902309

Allen, Jr, L H; Bisbal, E C; Boote, K J; Jones, P H ^[1]

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1. Univ. of Florida, Gainesville (United States)

Rising atmospheric carbon dioxide concentration [CO[sub 2]] is expected to cause increases in crop growth and yield. The objective of this study was to investigate effects of subambient, as well as superambient [CO[sub 2]] on soybean [Glycine max (L.) Merr] dry matter production and allocation for two reasons: to assess response of plants to prehistoric as well as future expected CO[sub 2] levels and to increase confidence in [CO[sub 2]] response curves by imposing a wide range of [CO[sub 2]] treatments. Soybean was grown in outdoor, sunlit, controlled-environment chambers at CO[sub 2] levels of 160, 220, 280, 330, 660, and 990 [mu]mol (CO[sub 2]) mol[sup [minus]1] (air). Total dry matter growth rates during the linear phase of vegetative growth were 5.0, 8.4, 10.9, 12.5, 18.2 and 20.7 g m[sup [minus]2]d[sup [minus]1] for the above respective [CO[sub 2]]. Samples taken from 24 to 94 d after planting showed that the percentage of total plant mass in leaf trifoliolates decreased with increasing [CO[sub 2]] whereas the percentage in structural components increased. At final harvest the respective [CO[sub 2]] treatments resulted in 38, 53, 62, 100, 120, and 92% seed yield with respect to the 330 [mu]mol mol[sup [minus]1] treatment. Total dry weight responses were similar. Late season spider mite damage of the 990 and 280 [mu]mol mol[sup [minus]1] treatments reduced yields. These data confirm not only that rising CO[sub 2] should increase plant growth, but also that plant growth was probably seriously limited by atmospheric [CO[sub 2]] in preindustrial revolution times back to the previous global glaciation.

• DOE Contract Number: AI01-81ER60001
• OSTI ID: 6902309
• Journal Information: Agronomy Journal; (United States), Journal Name: Agronomy Journal; (United States) Vol. 83:5; ISSN 0002-1962; ISSN AGJOAT
• Country of Publication: United States
• Language: English

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