Fall applications of N with a nitrification inhibitor are made. The majority or all of N is applied in the fall without a nitrification inhibitor. Irrigation Scheduling 4's - The University of Arkansas Irrigation Scheduling Program is followed. 3's - Some type of irrigation scheduling program us used that utilizes weather information and field measurements of evapotranspiration. 2's - Irrigation performed when judged necessary by land manager.
Decision is based on past experience combined with some field measurements.
1's - Irrigation frequency is not based on any measure parameters. 20 lb of K2O on soils testing high or excessively high for P and K. Calibration of fertilizer application equipment 4's - Application equipment is adjusted and calibrated at least once a year. 3's - Application equipment is adjusted and calibrated every other year. 2's - Application equipment has not been calibrated in the last 5 years. 1's - Application equipment has never been calibrated.