Marana Pima Test, 1997
G. L. Hart, Maricopa Agricultural Center
J. M. Nelson, Maricopa Agricultural Center
Glen Barney, Marana Agricultural Center
Nine pima cotton varieties were grown at Marana Agricultural Center as part
of the national cotton variety testing program. Lint yield, boll size, lint
percent, and plant population are presented in this report.
A pima cotton variety test was conducted as part of the national cotton
variety testing program. Varieties from the USDA and private seed companies
were included. S-7, the national standard , was the only variety used in this
Materials and Methods
This test was located in a level basin field with 600 foot runs and was
arranged in a randomized complete block design replicated four times. Plots
were four rows wide, 38 feet long with 40 inch spacing. The field was
preirrigated on 3 April and seed planted in moist soil on 16 April. Additional
irrigations were on 30 May, 20 June, 3 July, 17 July, 31 July, 15 August, 26
August and 10 September. The cotton received 104 lbs/acre of nitrogen during
the season. The planting was defoliated on 23 October and 7 November and the
center two rows of each plot were machine harvested on 20 November. Heat units
(threshold 86/55 degrees F) for the growing season were 4101 and rainfall during
the period (16 April to 23 October) was 2.02 inches. Fifty hand picked samples
taken out of two reps were used to determine lint percent and boll size.
Results and Discussion
Results of the test are shown in Table 1.
Yields ranged from 874 to 1079 lbs lint/acre. Although this test was thinned,
final plant populations were high for all entries.
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/az10064b.html
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