Adapt-N models the contribution of terminated cover crops to available nitrogen. This contribution depends on the following inputs:
Cover Crop Type: select grass, legume, or a mix of the two. Mixes are approximated to mostly grass, mostly legume, or an even mix.
Cover Crop Stand: select the best description for cover crop stand at the time of termination. Stand refers to the density of plants, which results from original planting density, crop establishment, and/or winter kill. Sparse stand implies lower plant density with large or numerous thin or bare spots. Medium stand implies medium density, moderate winter kill or thin patches or bare spots. Dense stand implies good establishment with little winter kill.
Cover Crop Stage: the approximate growth stage at which the cover crop was terminated. For mixes, including mixes that are mostly legume, use the growth stage of the grass component.
Cover Crop Incorporation (after termination): select whether the cover crop was left on the surface, partially incorporated, or fully incorporated.
Termination Date: enter the date the cover crop was terminated (surface killed or incorporated). This date must be before any spring tillage event.
It is important to note that when thinking about whether the crop is a Cover Crop or a Prior Crop in the Adapt-N configuration, the general rule of thumb is that if some or all of the crop is removed from the field, it would be considered a Prior Crop. If all the plant matter was left in the field, it is considered a Cover Crop.