Pima Regional 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
Eighteen Pima varieties were grown in a replicated trial 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 data
are presented in this report.
This trial was conducted to evaluate Pima varieties and experimental strains
under central Arizona conditions. Varieties from the USDA and private seed
companies were included. This trial was part of the national cotton variety
testing program with S-7 designated as the national standard and OA 312 and
S-6 being regional standards.
Materials and Methods
This trial 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 four
rows wide, 43 feet long, with 40 inch spacing. The field was preirrigated on
20 March and seed 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
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
Results and Discussion
Results of the trial are shown in Table 1.
Yields ranged from 463 to 1430 lbs lint/acre. The 1997 cotton growing season
was characterized by heavy Lygus infestations. Three and four year averages of
lint yields are presented 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/az10064a.html
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