A nine-row precision planter has 16 cells on each metering plate. Metering-plate/ground-wheel speed ratio is 1:2; wheel rolling diameter is 40 cm. With no skid, find within-row spacing in mm.
One wheel turn travels π(400) mm and gives half a plate turn, hence 16/2=8 seed drops per row. Spacing is π(400)/8=157.08 mm, C. Nine rows affect total planted width, not the spacing along an individual row.
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