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<br />CHAPTER II 1. <br /> <br />ECOLOGICAL STUDIES . . <br /> <br />47 <br /> <br />A. EFFECTS OF WATER SUPPLEMENTS ON GREAT PLAINS GRASSLANDS. <br /> <br />47 <br /> <br />1. <br /> <br />SYNTHESIS. <br /> <br />47 <br /> <br />2. PRODUCTION. <br /> <br />47 <br /> <br />3. FORAGE QUALITY . <br /> <br />48 <br /> <br />4. NUTRIENT AVAILABILITY. <br /> <br />49 <br /> <br />5. CONSUMERS. . . <br /> <br />49 <br /> <br />6. SOIL EROSION. <br /> <br />49 <br /> <br />7. <br /> <br />OTRER STUDIES. <br /> <br />49 <br /> <br />8. <br /> <br />LONGER TERM EFFECTS. <br /> <br />50 <br /> <br />B. <br /> <br />EFFECT OF DISCONTINUANCE . <br /> <br />50 <br /> <br />C. RECOMMENDATIONS - WEATHER MODIFICATION STRATEGY. . <br /> <br />50 <br /> <br />D. LITERATURE CITED . <br /> <br />52 <br /> <br />APPENDIXES . . . . <br /> <br />A. PLANTING DENSITY AND WATER STATUS OF WINTER WHEAT (TRITICUM <br />AESTIVUM) AFFECT GREENBUG (SCHIZAPHIS GRAMINUM) DENSITY. 55 <br /> <br />B. <br /> <br />WATER EF1PECTS ON WIND EROSION SUSCEPTIBILITY OF THREE <br />EASTERN 110NTANA GRASSLANDS . . . . . . . . . . . . <br /> <br />61 <br /> <br />C. <br /> <br />EFFECT OF IRRIGATION ON N-FIXATION BY FREE-LIVING <br />PROKARYOTES IN TWO GRASSLANDS. . . . . . . . <br /> <br />69 <br /> <br />D. <br /> <br />THE YIELD RESPONSE OF HIGH PLAINS GRASSLANDS TO WATER <br />ENRICHMENT, THREE PHASES. . . . . . . . . . . . . . . <br /> <br />77 <br /> <br />E. RESPONSE OF DIFFERENTIALLY ENRICHED GRASSLANDS TO CESSATION <br />OF IRRIGA~ION--DRY YEARS FOLLOWING WET . . . . . . . . . . .. 95 <br /> <br />F. <br /> <br />NYCTOPERIOD (PHOTOPERIOD) CONTROL OF VEGETATIVE GROWTH <br />OF HIGH PLAINS GRASSES . . . . . . . . . . . . <br /> <br />103 <br /> <br />G. RESPONSES OF ANNUAL AND PERENNIAL WHEATGRASSES TO <br />UNRELIEVED AND RELIEVED DROUGHT. . . . . . . . <br /> <br />III <br /> <br />H. PLANT RESPONSE TO SINGLE SHOWERS IN THE DRY SUMMER SEASON, <br />AGROPYRON SMITH II . . . . . . . . . . . . . . . . 129 <br /> <br />1. MESONET PREDICTOR - COVARIATE ANALYSIS . <br /> <br />145 <br /> <br />J. UST OF AUTHORS AND CURRENT ADDRESSES. <br /> <br />171 <br /> <br />viii <br /> <br />