Marana Upland Test

G. L. Hart, Maricopa Agricultural Center
J. M. Nelson, Maricopa Agricultural Center
Glen Barney, Marana Agricultural Center


Twenty four upland cotton varieties were grown at the Marana Agricultural Center. Lint yield, boll size, lint percent, plant population and fiber property data are presented in this report.


An upland cotton variety trial was conducted at the Marana Agricultural Center. Experimental strains and established varieties were included in the test. This test was not part of the national cotton variety testing program.

Materials and Methods

This trial 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 4 rows wide, 38 feet long with 40 inch spacing. The field was preirrigated on 3 April and seed was 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 growin season were 4130 and rainfall during the period ( 16 April to 23 October) was 2.02 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 trial are shown in Table 1. Yields ranged from 473 to 1557 lbs lint/acre. Fiber properties (HVI) are listed in Table 2. Although this test was thinned, plant populations were very high for most 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.
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