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DeKalb 656 and a new Northrup King hybrid, NK 7759, were the leading hybrids in both yields and adjusted gross income per acre. However, yields were lower than anticipated. The top yield was 8161 pounds per acre, providing an adjusted gross income of $480.30 per acre.

Eleven corn hybrids were grown for silage in Greenlee county in 1988. Excellent yields were recorded; the top hybrid, Northrup King's S 8505, produced nearly 40 tons per acre at 70% moisture. Laboratory analyses were run on samples from each hybrid; these analyses, plus calculations of crude protein and energy per acre were made.

Droughts in the Midwestern corn belt pushed up demand and prices for corn nationwide, but those droughts did not affect southeast Arizona. Rainfall increased; in some locations in Cochise County, rains nearly set a record. High moisture during July helped pollination and pushed Arizona growers into the limelight with a first and a third place win in the National Corn Growers yield trials. The national winner was Ted Johnson, with a yield of 253 bushels per acre (14,168 pounds per acre) (1, 2).

Information on silage corn yield and quality can help silage growers and users choose varieties that best fit their needs. We conducted a silage corn variety trial using 16 varieties that are commonly grown in the region. Variety RX940RR-2 produced the highest silage yield with an average of 28.2 ton/A and the variety 28V71 had the highest crude protein content (7.45%) among the varieties. Varieties that produced higher yield, higher crude protein, and lower NDF than the average of the sixteen varieties were 28V71, DKC67-88, and 818VT3.

Fourteen corn hybrids were tested, only one of which had previously been evaluated in University tests. Yields, stands, moisture in the grain at harvest, net value of the crop (after subtracting drying costs) and other agronomic data were determined. The top -yielding hybrid, Pioneer 3183, produced 11,942 pounds per acre but produced about $2 per acre less than the highest valued variety, DeKalb 656, which produced $460.54 per acre.

Five corn varieties with maturities varying from 95 to 108 days were grown in a double crop situation following barley. The variety that produced the highest net value (after deducting drying costs) yielded only $194.39 per acre, slightly less than the marginal cost of production.

Ten varieties of 115 to 125 day corn hybrids were tested in an on going variety trial in Greenlee county. Drying costs were also calculated to not only determine the top- yielding variety but also the variety having the highest net value after subtracting drying costs. Pioneer 3183 ranked top in both categories.