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<br />Changnon, S. A., and S. E. Hollinger, 1990: Crop yield results from simulated rain applications to agricultural
<br />plots in Illinois. Journal of Weather Modification, 22:58-62.
<br />
<br />Ten different levels of rainfall were applied (during 1987, 1988, and 1989) to agricultural plots in
<br />central Dlinois to discern effects on com and soybean yields. Increases in rainfall during a hot dry
<br />summer (June-August 1988) revealed sizable yield gains. For one inch of added rainfall, the yields
<br />increased 10 bu/acre for com and 4 bu/acre for soybeans. In a summer of near avemge rain (1989),
<br />the increases were less, about 5 bu/acre for com and 3 lbu/acre for soybeans. When summer rainfall
<br />exceeded 14 inches, yields of both crops were decreased. The various rainfall tests revealed that rain
<br />increases done only on days when natural rainfall was ~;0.1 inch provided no detectable yield increases,
<br />whereas a 40% increase on all rain days (the largest increase tested) produced the greatest crop yield
<br />increase (up to the 14-inch optimum). Com yields reacted very favorably to added rains on days with
<br />~ 1.0 inch of rain.
<br />
<br />Changnon, S. A., and W. H. Lambright, 1990: Response. Bulletin of the American Meteorological Society,
<br />71:1758-1759.
<br />
<br />No abstract.
<br />
<br />Changnon, S. A., S. E. Hollinger, and P. Garcia, 1989: Analyzing the effects of additional rainfall on com and
<br />soybean yields. Preprints, 6th Conference on Applied Climatology, Charleston, SC. March 7-10, 1989.
<br />American Meteorological Society, Boston, MA, J41-J45.
<br />
<br />No abstract.
<br />
<br />Changnon, S. A., 1988: Climate-based representations of summer rainfall in Illinois. Journal of Climate,
<br />1:1041-1046.
<br />
<br />Historical (1901-1985) summer (June-August) rainfall data in central Illinois were used to construct
<br />three typical rain conditions: one representing the typical dry summer (based on the driest 20% of the
<br />summers of the past 85 years), a typical wet summer (from the 20% wettest), and the near-avemge
<br />summer rainfall conditions (the 20% nearest the long-tenn avemge). Monthly rain totals for each type
<br />were established first, then daily rain frequencies were used to defme all individual rain day amounts,
<br />and historical rain-day amounts by date were used to assign rain days to dates throughout the three types
<br />of summers. In-day conditions relating to rainfall rates, time of rain, and durations were constructed for
<br />each day of rain. The resulting three summer rainfall conditions are being used to guide applications of
<br />water onto agricultural test plots (protected from natural rains) to measure crop yield effects from
<br />weather modification but the approach and system could serve other applications like effects of climate
<br />change.
<br />
<br />Changnon, S. A., R. R. Czys, S. E. Hollinger, F. A. Huff, J. Nespor, R. W. Scott, and N. E. Westcott, 1988:
<br />The Precipitation Augmentation for Crops Experiment. Phase II. Final Report, NOAA Cooperative
<br />Agreement NA87RAH07077. Illinois State Water Survey, Champaign, IL, 82 pp. (available from
<br />National Technical Infonnation Service, 5285 Port RoyaJ Rd., Springfield, V A 22161).
<br />
<br />No abstract.
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