Plant, Sorghum & Cropmod are mostly consistent in r4063.
If the 'SkipRow' argument to a sow command exists and is non-zero, it is used.
>> NB. Sorghum 'SkipRow' code (1,1.5,2) still has a different meaning from plant (0,1,2)! <<
If the 'Skip' argument is defined, they look for a string like "solid", "single", or "double".