Abstract
Measurement of yield variability is needed for developing and evaluating site-specificcrop management strategies. However, there are many sources of error in measuring the actualyield variability. The boundary effect on yield monitor data was studied by successive clipping ofyield monitor data. Results indicated that the correlations between grain yield and the NDVI onDOY 203 were improved as the field perimeter was clipped to 30.5 m inside of the fieldboundary. The coefficient of determination (r2) between the yield and NDVI on DOY 203improved from 0.67 to 0.76. Shannon-Weiners Diversity Index (SWDI) showed that diversity atthe perimeter was decreased as clipping was carried out. The yield variability was considerably higher in the clipped areas due to the speed of the harvester, headland harvest and time foryield monitor fill-up and emptying. The highly diverse yield monitor areas were about 2 timesthat of remotely sensed data as indicated by the SWDI.
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