Photosynthesis Under Field Conditions. IX. Vertical Distribution of Photosynthesis Within a Corn Crop

Wright, J.L. and Lemon, E.R. (1966) Photosynthesis Under Field Conditions. IX. Vertical Distribution of Photosynthesis Within a Corn Crop. Agronomy Journal. 58:265-268.

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Abstract

The vertical distribution of the photosynthetic fixation
of carbon dioxide within a crop of corn was calculated
from carbon dioxide profile data and transfer coefficients
obtained by analysis of windspeed measurements. Infrared
analyzers were used to measure the carbon dioxide
concentration at several heights within and above the
crop. The calculated total fixation for the day was approximately
60 g CO₂ m-? (equivalent to 470 pounds of sugar
per acre per day). The results demonstrated the importance
of the upper leaves in the fixation of carbon dioxide
and showed the increased fixation by the lower leaves
during periods of high light penetration. There was some
indication that a coupling existed between the level of
windspeed and fixation under conditions of high light
and relatively low windspeed. With refinement in technique
the method could be used to obtain more quantitative
estimates of the distribution of photosynthesis in
other crops.

Item Type:	Article
NWISRL Publication Number:	0060
Subjects:	Irrigated crops > Corn / maize Mass Import - autoclassified (may be erroneous)
Depositing User:	Dan Stieneke
Date Deposited:	20 Nov 2010 21:53
Last Modified:	15 Mar 2017 22:45
Item ID:	482
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/482