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Tab 1 e Fiqure CONTENTS--Continued TABLES Page 1. Site-s~ecific data related to the grain sorghum mOdel. 5 2. Sorghum model mean and median yields, mean nonnalized yields from relief of stresses, and percent of years each stress was dominant .. . . . . . . . . . 7 3. Rank correlation coefficients for model-simulated sorghum yield vs. precipitation by stage using observed precipitation . . . . . . . . . . . . . . . . . . . . . 9 4. ~lean values of modeled sorghum yield, precipitation amount, and number of precipitation events affected by selected precipitation enhancement scenarios. . . . . . . . . . 16 5. Number and percent of years with normalized sorghum yield more than given amounts for selected scenarios . . . . 19 6. ["lean scenario precipitation increases associated with a modeled 6-percent yield increase, and mean precipitation increases from table 4 . . . . . . . . . . . . . . . .. 20 FIGURES 1. 2. 3. 4. 5. Regression line and data points for Lubbock, Texas. Regression lines from sorghum model for all five sites Effect of water surplus on modeled sorghum yield at Okl ahoma City .. .. .... .. Effects of temperature and water stress on modeled sorghum yield at Concordia, Kansas.. ........ Histograms of modeled yield and precipitation increases for selected scenarios . . Sorghum model plot for Goodland 1961 Sorghum model plot for Goodland 1978 Sorghum model plot for Oklahoma City 1955 Sorghum model plot for Oklahoma City 1969 Sorghum model plot for San Angelo 1948 Sorghum model plot for San Angelo 1963 Sorghum model plot for Concordia 1966 Sorghum model plot for Concordia 1976 ;; 10 11 13 14 17 22 22 23 23 25 25 26 26 6a ~ b. 7a. b. 8a. b. 9a. b. i i