Abstract
Most yield mapping systems on combine harvesters measure the rate of clean grain flow. However, this rate at any instant is a function of yield over a finite region along the swath. This smoothing effect will limit the spatial resolution of the yield map. As a simplification it is assumed that flow rate is a convolution of yield along the swath and an impulse response function (i.r.f.) which summarises all processes in the combine. A model of this i.r.f. was derived from flow data for the opening and closing sections of 35 passes. The results were found to be consistent with an independent estimate of the time delay for grain flow through the combine and field comparisons of yield variation and flow rate for adjacent swaths. For the combine used, spatial resolution would seem to be limited to 15 to 25m. Deconvolution to achieve finer resolution appeared to be unsuccessful, probably because of noise in the flow sensor.
Published Version
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