Five between-row spacings of asparagus ranging from 60 to 120 cm were combined with five planting depths ranging from 15 to 30 cm, in a central composite rotatable design. After seven harvest seasons, the accumulated yields (kg·ha–1) declined linearly by 108 (+18) kg·ha–1 for each increase of 1 cm of depth. Accumulated yield also declined linearly by 6.6 (+4.5) kg·ha–1 with each increase of 1 cm in row width. Depth and row width did not interact. Effects of treatment on average spear weight were negligible. When the experiment was terminated, the final depth of all crowns, regardless of original planting depth, had floated to about 11.3 cm.
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