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This article in AJ

  1. Vol. 59 No. 1, p. 73-75
    Received: Oct 16, 1965

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Apparent Photosynthesis in Field Soybean Communities1

  1. Clarence M. Sakamoto and
  2. Robert H. Shaw2



Limited data of net photosynthesis observations in a field chamber study indicated that a soybean community was light saturated at about 6,000 to 6,400 foot-candles in the initial flowering stage and at 5,500 foot-candles in the pod-formation and the pod-filling period. Thereafter, the saturation level dropped abruptly. Maximum net photosynthesis at light saturation showed a similar pattern.

Data are presented which showed that although leaf area increased from flowering to pod-formation, net photosynthesis did not increase correspondingly

Projection of the net photosynthesis-light intensity curve indicates that the compensation point in the soybean community was about 1,000-1,500 foot-candles.

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