Project Summaries

01-937OK  Project Manager: J. M. Reeves


Randy Boman, Oklahoma State University

The effects of the extreme drought of 2011 were continued in Oklahoma in 2012. However, 2012 was "better than 2011" with "only" 57 days of high temperatures of 100 degrees or greater through September 15 at Altus. Beginning in October of 2011, rainfall provided some subsoil moisture accumulation by planting time, but little runoff in watersheds. Some timely rainfall events in mid-May provided sufficient moisture to ensure stand establishment. June precipitation was slightly above normal, and later planted fields emerged to excellent stands. Extreme heat and drought was again encountered beginning in mid-July. For the first time in its 60 plus year history, no irrigation water was released by the Lugert-Altus Irrigation District (LAID). Excessive triple-digit temperatures did not break until mid-August. On many days, hot desiccating winds prevailed during this period. July and August rainfall was 77% and 48% of normal, respectively, but a 30 to 40 day period without rainfall did occur. This situation resulted in the depletion of subsoil moisture by the crop, and without additional water, the crop in the LAID and in other areas with severely declining groundwater based irrigation. The year ended with over 90% of the state in the extreme or exceptional drought categories.

Replicated cotton variety demonstrations were established in nine cotton producing counties of Oklahoma. A total of 9 County Replicated Small Plot (CRSP) trials, and 9 large-plot Replicated Agronomic Cotton Evaluation (RACE) trials were planted in producer-cooperator fields. A total of 29 variety-related trials were planted. The majority of these trials were established under no-till or strip-till conditions. Of the 3 irrigated CRSP trials planted, only one site survived. RACE trials included 9 locations with 5 irrigated and 4 dryland sites, but only 4 irrigated trials were harvested. Test average yields ranged from a low of about 700 lb./acre in a furrow irrigated trial to over 1500 lb./acre in subsurface drip and in center pivot trials. Fiber properties at most sites were remarkably good. When yield, fiber CCC loan value, ginning costs, and seed and technology fees are considered, the statistically significant difference in top and bottom variety performers with respect to net value/acre averaged $195 across three sites where the same entries were planted. Top performers with respect to net value/acre included PhytoGen 499WRF, Deltapine 1219B2RF, and NexGen 1511B2RF.

In addition to the variety testing work, several trials were initiated to test various new cotton inputs. Nichino America is investigating new formulations of their ET product and two harvest aid trials with 4 replicates were established: 1) ET formulation trial I-early with 4 treatments applied at 45% open bolls on September 18; and 2) ET formulation trial II-late with 4 treatments applied at 65% open bolls applied on October 3. A product was also tested for FMC to investigate the efficacy of the new Display harvest aid product on irrigated cotton. A harvest aid demonstration was initiated in a Harmon County subsurface drip irrigated field. This consisted of 13 treatments, and a well-attended field day was held at the site.

The Oklahoma State University Extension Cotton Team generated a total of 13 editions of the Cotton Comments newsletters which were published and sent directly to 237 e-mail recipients. The newsletter survey resulted in 53 respondents providing feedback. Based on the newsletter survey, an additional 99 recipients received the newsletter from someone who forwarded it to them. Newsletters were also posted to the Web sites and For the Web site, the yearly number of unique visitors was 4,621. Recipients were asked to rate on a scale of 1-5 (1 being not very useful) and 5 (being extremely useful). The result was an average ranking of 4.45. On the question of topics being timely and discussed, the result was 4.43. For the question on whether the newsletter should be continued, the result was 100%.


Project Year: 2012

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