Fourteen acala and four delta varieties were tested in two separate field trials in Greenlee county in 1991. Yields at both sites were about 1000 pounds per acre (seed cotton yields) than the 1990 yields. Cool weather and wet grounds delayed planting one to two weeks compared with 1990. The highest yielding varieties, both acala and delta type, produced around 2300 pounds per acre of seed cotton. An experimental New Mexico acala, B510 and Stoneville 506 were the top varieties.

Twelve upland cotton varieties were compared in an on farm trial in Graham county. The highest yielding variety was Stoneville 324, a relatively new semi-smooth- leafed variety from Stoneville with fiber qualities that approach those of DPL 90. Stoneville 324 yielded 4226 pounds of seed cotton with HS Sal 10 following closely behind at 4158 pounds per acre.

Eight field experiments were conducted across the cotton growing areas of Arizona in 1992 for the purpose of evaluating Upland cotton varieties in terms of adaptability and performance. Five commercial cottonseed companies participated in the program. Two varieties were submitted from each company at each location. Experiments were conducted on grower-cooperator fields in each case except one, which was conducted on a University of Arizona Agricultural Center. Locations used in the program spanned the range of conditions common to cotton producing areas of the state from about 500ft. to 3,000ft. elevation. Results indicated a broad range of adaptability and competitiveness on the part of each of the participating companies and their representative varieties. Each of the companies offers a compliment of varieties that can serve to match various production strategies commonly employed in the state as well as showing a strong capacity to be regionally adaptive.

Eighteen short staple varieties were grown in a replicated trial at the Maricopa Agricultural Center as part of the National Cotton Variety Testing Program.

Thirty six short staple varieties and thirteen long staple varieties were grown in a replicated field trial on the Safford Agricultural Center in Graham county. Stoneville 324 was the highest yielding short staple variety in the trial with a yield of 4733 pounds per acre of seed cotton. The average yields of short staple varieties was greater than in 1991. Long staple cotton did not fare as well with the weather as did the short staple. The yield of S-6 was about 100 pounds of seed cotton less than in 1991. The good news is that other long staple varieties are being developed that can out yield S -6 in the high desert area. O & A Pima was the highest yielding variety with a yield that exceeded S-6 by about 500 pounds of seed cotton per acre. S-7 followed closely behind O & A Pima 4 and both matured quicker than S-6. Heat unit data from the past couple of years are given in this report along with the average heat unit accumulation.

Two New Mexico acalas, one California acala, two upland hybrids and two other upland varieties were evaluated in a two-part trial at one location in Greenlee county in 1992. The New Mexico acalas topped the trial with 1517-91 having the highest yield with 2227 pounds of seed cotton per acre.

Twelve pima varieties were grown in a replicated trial at the Maricopa Agricultural Center as part of the National Cotton Variety Testing Program.

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Twenty five long staple varieties were tested in a replicated small plot trial on the Safford Agricultural Center in Graham county at an elevation of 2950 feet. The highest yielding variety in this study was Hazera 83-208 with a yield of 1180 pounds of lint p1er acre. This interspecific hybrid from Israel was the highest yielding cultivar in the 1999 test, also. The top five varieties consisted of two interspecific hybrids from Isreal, a variety developed by the University of Arizona and entries from Buttonwillow Research and California Planting Cotton Seed Distributors (CPCSD). The average yield in the trial was the same as last year, but the highest yield was slightly lower. Yield and other agronomic data as well as fiber quality data are contained in this paper.