Extractable DOC and DON from a dry-land long-term rotation and cropping system in Texas, USA

► DOC and DON relationship is decoupled when chemical extractants are used. ► Continuous cropping decouples DOC and DON relationship. ► Cropping is more important than tillage for ammonium-N recovery. ► Nitrate-N pool is larger than ammonium-N and DON pool.