EFFECTS OF ROTATION AND NITROGEN ON YIELD AND QUALITY OF POTATOES

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Abstract
The effects of eight rates of N, ranging from 0 to 245 kg/ha, on yield, specific gravity and petiole nitrate content of potatoes (Solanum tuberosum L.) grown continuously in the same soil and in a 2-yr rotation with corn were evaluated over a 4-yr period. Yields under continuous potato culture were lower than yields in the corn-potato rotation. Soil infestation with Verticillium wilt (Verticillium albo-atrum) was a factor contributing to this yield reduction. The response pattern to added N was identical for both planting systems each year and was best described by a quadratic curve. The optimum rate of N for maximum yield under the irrigated, coarse-textured soil conditions of this experiment was about 175 kg/ha. This is 40 kg higher than the current N recommendation for potatoes in Ontario. Specific gravity under continuous potato culture was significantly reduced each year, but rates of N sufficient for maximum yield did not reduce specific gravity. Tissue nitrate-N reflected the rate of N applied and was significantly higher in petioles from continuous potato plots on the second sampling date.

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