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<br />using low estimates of range productivity). With a higher <br />estimate of range production, a'new revenue increase of up <br />to $43 million could be expected (16). It should be noted <br />that this work concerned changed in revenue due to added rain, <br />but did not address factors which may influence revenue levels. <br />These factors were not expected td influence the change caused <br />by augmented precipitation. <br /> <br />Estimates of benefits are conservative in that possible <br />interaction of extra fertilizer with the added rainfall would <br />add to production. In addition, the added moisture could <br />allow continuous cropping which'would increase production. <br />A possible adverse effect might: be worsening of the saline <br />seep problem in some areas in Montana if rainfall timing and <br />crop management are not carefully ~ontrolled. <br /> <br />2; 2.1. 3 Kansas. A study of the economic and environ- <br />mental effects of altering the pre'cipitation pattern was also <br />conducted in Kansas (13). Rainfall variability, impacts on <br />different types of storm systems, al t,erna t i ve economic conditions, <br />and differential effects on various agricultural areas were <br />included in the study. <br /> <br />The Kansas study focuses on potential benefits of successful <br />cloud seeding. A model was devel~ped to simulate cloud seeding <br />with rainfall rates and amounts v~ried from a 10 percent decrease <br />to a 75 percent increase. When ~pplied to a 30-year series <br />of rainfall observations, the model indicated a significant <br />change in growing season rainfatl. While findings were not <br />uniform throughout the state, generally rainfall increases <br />ranged from 3.81 centimeters (1~50 inches) in southeastern <br />Kansas to 5.72 centimeters (2.2$ inches) in the northwestern <br />region (13). <br /> <br />2-5 <br />