The Oklahoma Agricultural Experiment Station official variety tests (OVTs) were planted at the Southwest Research and Extension Center at Altus (Lugert-Altus Irrigation District – furrow irrigated), Tipton Valley Research Center (dryland), and Caddo Research Station at Fort Cobb (center pivot irrigated) in 2016.
1) Altus conventional tillage furrow irrigated OVT – planted May 27 at 4 seeds/row-ft, harvested November 21. This trial experienced severe Bacterial blight infection beginning in late July.
2) Tipton no-till dryland OVT – planted June 8 at 3 seeds/row-ft, harvested November 22.
3) Fort Cobb no-till in terminated wheat cover – low elevation spray center pivot irrigated OVT – planted May 26 at 4 seeds/row-ft, harvested November 30.
- Four replicates were planted and harvested at all sites. Plots were four rows wide at all sites. Row spacing at Altus and Tipton was 40 inches, and row spacing was 36 inches at the Fort Cobb site. Plot lengths in all trials were 30 ft. Harvested area was the center two rows by the length of the plot. Trials were harvested with a brush-roll plot stripper. Grab samples were taken by plot in three replicates for lint and seed turnouts and High Volume Instrument (HVI) fiber quality analyses.
- These grab samples were ginned on small plot ginning equipment at the OSU SWREC and lint samples were submitted to the Cotton Phenomics Laboratory at the Fiber and Biopolymer Research Institute at Texas Tech University for HVI analyses.
- Additionally, 50-boll samples were taken from each plot in three replicates and other data (including boll sample lint fractions, boll size, seed index, lint index, and seed per boll) were derived from those. Additional collected data included plant height from the soil surface to terminal and a visual estimate of storm resistance (1-9 with 9 tightest).
- Important cultural practices are noted in Table 1, and results for Altus (Tables 2 and 3), Tipton (Tables 4 and 5), and Fort Cobb (Tables 6 and 7) are presented below. Click here to download .pdf including tables.