%J Agronomy Journal %R 0171 %V 61 %A E.R. Lemon %A J.L. Wright %D 1969 %X In a previous communication we described a meteorological method of assessing the vertical distribution of photosynthesis and respiration activity in a corn crop. The method, however, is tedious. Here we describe a much simpler method. Results indicate that all the leaves of a corn crop appear to follow the same near-linear light response curve, at least above the compensation point. Below the compensation point, all leaves evidently respire very little. %L nwisrl188 %N 3 %T Photosynthesis Under Field Conditions. XA. Assessing Sources and Sinks of Carbon Dioxide in a Corn (Zea mays L.) Crop Using Momentum Balance Approach %P 405-411