Crop Situation Update
If it’s any consolation, by August 8, 2011, we had encountered 74 days of 100 degrees or greater high temperatures at Altus. For 2012 through August 8, we have had “only” 46 (1 in April, 9 in May, 11 in June, 18 in July, and 7 in August). Out of the last three weeks, maximum temperatures have been 100 degrees or greater for 19 of those days. Generally, low humidities and high maximum wind gusts have also been noted. This situation, when coupled with the lack of substantial timely rainfall in most cotton producing areas, has resulted in severely reduced yield potential on standing acres. Irrigated fields with adequate water (few) are still progressing nicely. However, groundwater-based irrigation capacity has declined significantly according to several area producers. Because of the lack of mid-season rainfall, many irrigated acres will produce disappointing yields. Most dryland cotton in the state has been stressed for many days. Season long cotton heat unit accumulation for a May 1st planting date through August 8th at Altus totals 2233, which is about 24% above normal (1807). These factors all combine to result in a difficult situation for Oklahoma cotton in 2012.
Based on this week’s results from IPM Extension Assistant Jerry Goodson’s surveys, of 25 locations monitored (see Table 1), 14 have “bloomed out the top” (hit nodes above white flower or NAWF= 0) and reached the point of termination of insect scouting. Three sites were “still in the game” with NAWF near 5. Only fields with high irrigation capacities, timely water applications, and efficient delivery systems are still producing potentially harvestable yield at this time (see photo below).
Harmon County Subsurface Drip Irrigated RACE Trial near Hollis.
August 9, 2012 Volume 2 Edition 10 Volume 1 Edition 7
OSU Southwest Oklahoma Research and Extension Center