Upland Regional Cotton Variety Test at the Maricopa Agricultural Center, 1997
G. L. Hart, Maricopa Agricultural Center
J. M. Nelson, Maricopa Agricultural Center
L. J. Clark, Safford Agricultural Center
Thirty four upland cotton varieties were grown at the Maricopa Agricultural Center as part of the national cotton variety
testing program. Lint yield, boll size, lint percent, plant population and
fiber property are presented in this paper.
An upland cotton variety test was conducted as part of the national cotton variety testing program.
This program allows varieties from many sources to be evaluated at various locations across the cotton belt.
Included in the test were four national standards, sixteen regional standards and fourteen other varieties from
across the cotton belt. The national standards are grown in five other tests across the cotton belt. The national
standards are Maxxa, Paymaster HS 26, SG 125 and STV LA 887.
Materials and Methods
This test was located in a level basin field with 850 foot runs and was arranged in a randomized complete block design
replicated five times. Plots were 4 rows wide, 43 feet long, with 40 inch spacing. The field was preirrigated on 20
March and seed was planted in moist soil on 10 April. Additional irrigations were on 30 April, 19 May, 5 June, 20 June,
2 July, 14 July, 24 July, 4 August, 15 August and 5 September. The cotton received 120 lbs/acre of nitrogen during the
season. Orthene and Knack was applied on 23 July, Lannate and Lockon on 12 August, Lockon and Orthene on 21 August, and
Applaud and Penncapp on 29 August. The planting was defoliated on 29 September and 6 October and the center two rows of
each plot were machine harvested on 29 October. Heat units (threshold 86/55 degrees F) for the growing season were 4161
and rainfall during the period (10 April to 29 September) was 1.87 inches. Fifty hand picked boll samples taken out of
two reps were used to determine lint percent and boll size. The same sample was ginned and twenty grams of lint was
analyzed for fiber properties.
Results and Discussion
Results of the test are shown in Table 1. Yields ranged from 879 to 1503 lbs lint/acre. The 1997 cotton growing season
was characterized by heavy Lygus infestations. Three and four year averages of lint yield of some varieties are
represented in Tables 2 and 3, respectively.
Fiber properties (HVI) are listed in Table 4.
This is a part of publication AZ1006:
"Cotton: A College of Agriculture Report," 1998, College of Agriculture, The University of
Arizona, Tucson, Arizona, 85721.
Any products, services, or organizations that are mentioned, shown, or indirectly
implied in this publication do not imply endorsement by The University of Arizona.
The University is an Equal Opportunity/Affirmative Action Employer.
This document located at http://ag.arizona.edu/pubs/crops/az1006/az10063b.html
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