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<br />Changnon, S. A., and S. Hollinger, 1988: Use of unique field facilities to simulate effects of enhanced rainfall
<br />on crop production. Journal of Weather Modification, 20:60-66.
<br />
<br />In the spring of 1987, recently constructed "rain shelters" became available in which field experiments
<br />of rain effects on crops could be conducted. Some shelters were designed to be moved over the test
<br />plot area during a rain event to exclude natural rain. When there was no precipitation falling, the
<br />shelters could be moved off the plots so the plants experienced the same weather as other crops in the
<br />region. An overhead sprinkler irrigation system was installed in the shelters so the time, amount, and
<br />quality of water applied to each plot could be controlled. This system allowed for the establishment of
<br />an experimental design to begin to test the validity of the crop-weather model results in an actual field
<br />situation. This paper addresses the 1987 field experiment, the facility, the rain models used, and the
<br />yield results.
<br />
<br />Changnon, S. A., F. A. Huff, and C.-F. Hsu, 1988: Relations between precipitation and shallow groundwater in
<br />Illinois. Journal of Climate, 1: 1239-1250.
<br />
<br />The statistical relationships between monthly precipitation (P) and shallow groundwater levels (GW) in
<br />20 wells scattered across Illinois with data for 1960-84 were defined using autoregressive integrated
<br />moving average (ARIMA) modeling. A lag of one month between P to GW was the strongest temporal
<br />relationship found across Illinois, followed by no (0) lag in the northern two-thirds of Illinois where
<br />mollisols predominate, and a lag of two months in the alfisols of southern Illinois. Spatial comparison
<br />of the 20 P-GW correlations with several physical conditions (aquifer types, soils, and physiography)
<br />revealed that the parent soil materials of outwash alluvium, glacial till, thick loess (~2.1 m), and thin
<br />loess (>2.1) best defined regional relationships for drought assessment.
<br />
<br />Equations developed from ARIMA using 1960-79 data for each region were used to estimate GW levels
<br />during the 1980-81 drought, and estimates averaged between 25 to 45 em of actual levels. These
<br />estimates are considered adequate to allow a useful assessment of drought onset, severity, and
<br />tennination in other parts of the state. The techniques and equations should be transferrable to
<br />regions of comparable soils and climate.
<br />
<br />Changnon, S. A., D. Brunkow, R. R. Czys, A. Durgunoglu, P. Garcia, S. E. Hollinger, F. A. Huff, H. T. Ochs,
<br />R. W. Scott, and N. E. Westcott, 1987: Precipitation Augmentation for Crops Experiment: Phase II.
<br />Exploratory research, year 1. Final Report, NOAA Grant NA86RAH05060, Contract Report 430.
<br />Illinois State Water Survey, Champaign, IL, 195 pp. (available from National Technical Infonnation
<br />Service, 5285 Port Royal Rd., Springfield, V A 22161).
<br />
<br />No abstract.
<br />
<br />Changnon, S. A., and F. A. Huff, 1987: Design of the 1986 Illinois weather modification experiment. Journal
<br />of Weather Modification, 19:77-81.
<br />
<br />A summary of the design aspects of the 1986 PACE field project is presented. A review of the
<br />experimental background, overall objectives, the 1986 objectives. and an assessment of the 1986 field
<br />effort and design is provided. In general, the design proved satisfactory, although a few modest
<br />adjustments were needed to overcome certain unforeseen sampling problems.
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