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<br />surf ace temperature, not always cons idered in prec ipitat ion enhancement <br />projects, should be included in the climatology in areas where temperature <br />stress is likely. <br /> <br />Additional precipitation in some years will greatly increase crop yield but <br />in other years will have little or no effect on yield. Unfortunately, our <br />ability to recognize in advance which year will benefit and which will not <br />is less than perfect. We know that even modest additional precipitation at <br />crucial times during plant growth and development can dramatically improve <br />yield, but the existence of treatable clouds during these times cannot be <br />assured. This suggests that weather modification technology is unlikely to <br />be consistently successful if it is reserved for use only in "favorable" <br />years or at crucial times. Therefore, the most practical plan for an opera- <br />tional precipitation enhancement project is one that includes criteria for <br />suspending operations as necessary to prevent possible environmental and <br />social problems but that specifies the treatment of every suitable opportunity <br />across a broad spectrum of cloud and storm conditions from the preplanting <br />period through to maturity. <br /> <br />;;;; <br /> <br /><I. <br /> <br />Acknowledgments. - We wish to express our appreciation to Dr. Bernard Silverman <br />of the Bureau of Reclamation for proposing this research topic and for his <br />many helpful suggestions as the work progressed; to Drs. Gerald Arkin and <br />William Dugas of the Texas Agricultural Experiment Station for their thoughtful <br />review of this paper, and Dr. Richard Vanderlip of Kansas State University <br />for his helpful comments during its preparation. Special thanks to <br />Ms. Connie Todd for her diligence and patience in typing the many revisions <br />of the paper. <br /> <br />~ <br /> <br />~ <br /> <br />28 <br />