By Ralph Mazzanti and Ron Baker, RRVP Coordinators
South Arkansas: The heat units have most fields maturing fast. In some cases maturity is a few days earlier with a current DD50. Greenseeker technology was utilized on all fields and determined 6 of 9 fields requiring no midseason nitrogen. Two hybrid fields in Chicot and Arkansas Counties are 100% headed and have expected drain dates on 8/1 and 8/3, respectively. Some amazon sprangletop escapes have appeared in the Chicot and Monroe County fields. Stink bugs are on the increase in some fields while are dispersing in others from week to week. The Chicot County field reached threshold levels of stink bugs and was treated with Lambda-cy.
North Arkansas: All fields are progressing well with three beginning to head and the others predicted to do so within the next ten days or less. Warmer weather has continued to help develop the fields much closer to their DD50 predicted growth stage compared to earlier in the season. Nitrogen loss due to volatilization of preflood N in White, Independence, and Clay Counties and denitrification in Randolph County required corrective N treatments. This resulted in abandoning the single-shot preflood N strategy for Independence and Clay Counties. The correction in those counties was made with a normal midseason N application. White and Randolph Counties required spot treatment N corrections prior to midseason.