| Abstrakt: |
Vegetative and reproductive parameters were measured at maturity on field‐grown soybean plants [Glycine max(L.) Merr., var. Hark] given CO2enrichment to 1,200 (±150) ppm for 5‐week periods corresponding to vegetative, flowering, and pod‐filling stages of development. CO2enrichment during the vegetative stage had no effects on the measured parameters at maturity. CO2enrichment during flowering caused increased node numbers, leaf and stem dry weights, and pod numbers. Seed size decreased and need yield was not affected. CO2enrichment during pod filling had no effects on vegetative parameters, but caused a slight increase in pod number, and a marked increase in pod weight and seed yield at maturity. These results are discussed in terms of source‐sink relationships and the limitations imposed by the availability of photosynthate. |
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