Yield Implications of Delaying the Sidedress Application of Nitrogen in Corn and Cotton in Arkansas.

Timely nitrogen applications are critical to optimize corn and cotton yield potential; however such applications are sometimes compromised by weather patterns and may conflict with other cultural practices. A series of studies with corn and cotton were established, in Arkansas, to assess potential yield implications as a result of delaying the N sidedress application in both crops, beyond the perceived optimum growth stage. Initial results show that the risk of yield potential increases if nitrogen is applied after the V8 growth stage in corn, and 200 heat units after bloom in cotton, provided that a minimum of 55 kg N per hectare were applied by first square in cotton.