NDP-037

Carbon Dioxide Enrichment: Data on the Response of Cotton to Varying CO2 Irrigation, and Nitrogen (1992)

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B. A. Kimball, J. R. Mauney, R. L. La Morte, G. Guinn, F. S. Nakayama, J. W. Radin, E. A. Lakatos, S. T. Michell, L. L. Parker,
G. J. Peresta, P. E. Nixon III, B. Savoy, S. M. Harris, R. MacDonald, H. Pros, and J. Martinez

DOI: 10.3334/CDIAC/vrc.ndp037

This NDP presents data on the effects of continuous CO2 enrichment of cotton during five consecutive growing seasons, 1983 to 1987, under both optimal and limiting levels of water and nitrogen. Unlike many prior CO2-enrichment experiments in growth chambers or greenhouses, these studies were conducted on field-planted cotton at close to natural conditions with open-top chambers. Measurements were made on a variety of crop-response variables during the growing season and upon crop harvest. The initial experiment examined the effects of varying CO2 concentration only. During the following two seasons, the interactive effects of CO2 concentration and water availability were studied. During the final two seasons, the interactions among CO2 concentration, water availability, and nitrogen fertility were investigated.

The data include identification variables (such as year, institution and site codes, and treatment regimens), intermediate growth measurements (such as plant height, leaf-area index, number of flowers, and dry weight of leaves) taken at various times during the growing season, and crop-harvest results (such as lint yield, seed yield, and total aboveground dry biomass). These data will be useful in studying the possible future effects on crop production of a doubling of global atmospheric CO2 concentrations and for validating crop-growth models designed to predict the effects of elevated CO2 on cotton growth. The data show that, for all five growing seasons and all experimental treatments, cotton yields and plant dry weights were increased significantly by CO2 enrichment.

The NDP includes a 48.4-kB ASCII data file, FORTRAN and SAS computer codes for accessing the data, a descriptive file, and written documentation. The documentation includes a supplemental text that describes and presents data for many other parameters, including daily weather, soil profile properties (e.g., initial soil moisture and nitrogen conditions), and irrigation and fertilizer treatments. These additional data are available from CDIAC on magnetic media upon request.

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