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Response of Soybeans to a Carbon Dioxide-Enriched Atmosphere¹

Two soybean varieties were exposed to 350 and 1350 ppm CO₂ from seedling to maturity in Mylar chambers in the greenhouse. There was a marked increase in plant growth in the CO₂ atmosphere at a concentration of 1350 ppm. Seed yields were increased 57% in the variety ‘Hark’ and 40% in the variety ‘Chippewa-64’. The increase in seed yield was primarily due to an increase in the number of pods per plant. Many of the new pods were born on the longer branches in the CO₂ enriched atmosphere.

Key Words: photosynthetic response to CO₂ • yield response to CO₂

² Formerly Research Associate (now Agronomist-in-Charge, U. S. Regional Soybean Laboratory, Urbana Ill., Crops Research Division, ARS, USDA.) and Associate Professor of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota.

Received for publication February 6, 1967.

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