Abstract
Tuber greening is one of the major causes of quality loss in the potato industry, however, the impact of nitrogen in-field fertilization on this visual defect remains unknown. Two field experiments, one in Tasmania with final N treatment rates of 40, 100 and 190 kg N ha−1 for Nicola and 35, 95 and 185 Kg N ha−1 for Maranca, and another in South Australia with N rates of 100, 200 and 300 kg ha−1 for Maranca, showed a positive linear relationship (R2 = 0.99, 0.86 and 0.90, respectively) between tuber N content and tuber greening, as determined by chlorophyll content. However, increased N fertilization rates did not directly translate to increased tuber N content, with responses appearing to vary with variety and location. We conclude that tuber N content is a risk factor associated with tuber greening, but the manipulation of tuber N content through N fertilization rate is not straightforward and may depend on variety and location.
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