The YBMZ technique used in this study is a new technique
and was developed with the intent to further improve the accuracy
of the SCMZ technique in classifying high-, medium-,
and low-productivity areas of the field. This technique relies
on five GIS data layers for zone delineation: (i) multispectral
bare-soil aerial imagery (red, green, and near-infrared bands),
(ii) soil organic matter, (iii) soil cation exchange capacity, (iv)
soil texture (sand, silt, and clay content); and (v) the yield map
from the previous growing season.