Cotton Planting Forecast

 

Archives

UCCE APPROVED ACALA VARIETY TRIALS

 

1998 Studies
Eleven approved Acala varieties were planted in tests in 1998. Varieties included the standard, Maxxa, plus Phytogen-33, SJ-2, GC-510, Royale, DPL-6204, GC-535, C-141, GTO Maxxa, GC-500 and DP-6211. Tests were located in each ofthe six San Joaquin Valley cotton-producing counties, plus the Shafter and West Side Research and Extension Centers of the University of CA. Tests in grower fields were large scale, with individual entries grown in 6 to 8 row width plots averaging 1300 feet or more in row length. All studies had 4 replications in a randomized complete block design. Studies at West Side and Shafter locations were smaller, with plots 4 rows in width by 300 feet length…

 

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LONG-TERM NITROGEN MANAGEMENT TRIALS

 

The response o f Acala cotton in California to a range o f applied nitrogen treatments are under investigation in a multi-year, multi-site experiment. Goals of the experiment are to identify crop growth and yield responses to applied nitrogen and to provide information to better assess the utility of soil residual N estimates in improving fertilizer management. Results obtainedd uring the first three years o f this project have shown positive responses to increases in applied N across the 50 to 200 lbs N/acre range…

 

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INTERACTION OF COTTON NITROGEN FERTILITY PRACTICES AND COTTON APHID POPULATION DYNAMICS IN CALIFORNIA COTTON

 

Introduction:
During the last 10 years, the cotton aphid (Aphis gossypii) has developed from a non-pest to one of the most significant insect pests of California cotton. For instance,in1997, cotton aphid outbreaks were severe and an estimated 3.5% yield loss occurred despite -$40/acre control costs which were incurred. Cotton aphid infestations during the mid-season (July to mid-August) reduce cotton lint yields since the aphids act as a significant sink, competing with the bolls, for energy. The late-season infestations (mid-Aug.to Sept.) are problematic because the aphids deposit honeydew on the exposed cotton lint, which reduces the lint value. Reasons for this change in pest status of cotton aphid are unclear; however, one of the most noticeable changes in cotton production over the last 10 years is the use of a plant growth regulator instead of irrigation and nitrogen deficits to limit early-season cotton vegetative growth. This has allowed cotton production practices in the SJV to evolve to higher nitrogen fertilization and irrigation inputs.

 

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CA UPLAND VARIETY TRIALS – LARGE-SCALE AND SCREENING

Bob Hutmacher
.UCCE Extension Agronomist
Department of Agronomy and Range Science
UC Davis I Shafter REC
(661) 746-8020 I fax (661) 746-1619
rbhutmacher@ucdavis.edu

Cooperators: Ron Vargas, Steve Wright, Bill Weir, Bruce Roberts,
Dan Munk, Brian Marsh, Mark Keeley, Raul Delgado, Scott Perkins

1999 Studies

In 1999, studies are underway at nine locations in the San Joaquin Valley in tests run by our office in cooperation with the six San Joaquin Valley UCCE cotton Farm Advisors.  At the time of writing this report, we have limited data to report, since no final plant mapping data have been analyzed and we are still a way off from defoliation and harvest. Instead, the following will be a brief description of the type of testing program initiated for 1999, and data collection plans.

Two different types of studies are underway this year, (a) a large-scale plot study on grower fields to evaluate varieties in large plots, where adequate seed…

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