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<br />I <br />I <br />I <br />I <br />I' <br />1 <br />I <br />I, <br />I <br />, <br />I <br />, <br />I' <br />I <br />I, <br />I <br />J <br />I <br />I <br /> <br />2035 <br /> <br />l2 percent over estimated yields given in Table 6.24. <br /> <br />Crop cultural practices are summarized in Table 6.26. These <br /> <br />cultural practices are used in each climatic zone judged suitable for <br /> <br />corn silage production. Fertility requirements, summarized in <br /> <br />Table 6.27, vary in each climatic zone. <br /> <br />6.2.6 Grain Sorghum <br />Grain sorghum acreage has steadily increased since about 1970 and is <br />now considered an important feed crop in Colorado. Based on <br />Colorado Agricultural Statistics published by the Colorado <br />Department of Agriculture, Colorado ranked twelfth in grain sorghum <br />production during 1984 with approximately 15,910,000 bushels <br />harvested from about 430,000 acres. About 21 percent of the <br />harvested grain sorghum acreage in Colorado was irrigated in 1984 and <br />yielded an average of about 75.5 bushels/acre. Dryland production <br />averaged about 26.5 bushels/acre in 1984. Grain sorghum was not <br /> <br />planted in either Montezuma or La Plata counties in 1984. <br /> <br />Grain sorghum can be grown as both an irrigated and dry land crop. <br /> <br />Grain sorghum produces the highest yields in warm or hot regions if <br />sufficient soil moisture, either from summer rains or irrigation, <br />can be provided. The minimum temperature needed for sorghum growth <br />is about 59 degrees F. Consequently, cooler climatic conditions or <br />a short frost-free season constrain the ability to produce this crop. <br />The grain sorghum plant is capable of withstanding heat extremes <br /> <br />6- 40 <br />