Potato growth, nitrogen balance, quality, and productivity response to water-nitrogen regulation in a cold and arid environment.

The single effect of nitrogen and water application on plant height had a highly significant effect ( p <0.01) ( Figure 3A ).

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3.3.2 Soil NH 4 + -N In the potato field, the soil NH 4 + -N content showed a decreasing trend with the soil depth increasing at harvest ( Figures 7A–C ).

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The results of this study showed that potato starch, vitamin C and protein content with the increase of nitrogen application showed a trend of increasing and then decreasing, and reached the peak under N2 treatment (nitrogen application of 185 kg ha -1 ), which is consistent with the previous finding that the quality of potato tubers with the increase of fertilizer application showed the pattern of change of the single-peak curve ( Wang et al., 2017 ).

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