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Corn Grain, Corn Silage, and Sorghum <br />Corn grain, corn silage, and sorghum have similar irrigation water requirement, therefore, further <br />investigation was made into the potential for creating a combined crop group. TR-21 <br />recommends growing season start and end dates based on average monthly temperature or frost <br />date as shown in Table 3. <br />Table 3 <br />TR-21 Recommended Growing Season <br /> <br />Crop Earliest Planting date as related <br />to mean air temperature Latest Maturing date as related <br />to mean air temperature <br />Corn Grain 55 De Mean Tem 32 De Frost <br />Corn Silage 55 Deg Mean Temp 32 Deg Frost <br />Sor hum 60 De Mean Tem 32 De Frost <br />Figure 2 shows the TR-21 Blaney-Criddle crop coefficients for corn grain, corn silage, and <br />sorghum. Note that if the beginning and ending of growing season criteria are the same, similar <br />crop coefficient curves will result in similar monthly irrigation water requirements at the same <br />location. <br />Figure 2 <br />TR-21 Blaney-Criddle Crop Coefficients <br />1.2 <br />0.8 <br />1 <br />c <br />a~ <br />.~ <br />0 0.6 <br />U <br />O <br />L <br />U <br />0.4 <br />0.2 <br />0 <br />0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 <br />Percent of Growing Season <br />Corn Grain Corn Silage ~^Sorgum <br />Page 7 of 13 <br />