The effects of nitrogen form on potato plant growth, tuber formation and tuber yield were studied under sand cultural condition using cultivars Kexin 1 and Favorita in 2013 and 2014. The results showed that there were no significantly different influences on plant height, leaf area, leaf SPAD value, plant dry matter accumulation and tuber weight when applied nitrite (NO 3 -N) or ammonia (NH 4 -N) before tuberization. However, there were higher leaf SPAD value, faster plant growth and higher tuber yield under application of NH 4 -N after tuberization compared with that of NO 3 -N. The plants treated with NO 3 -N before tuber initiation produced more tubers per plant than those treated with NH 4 -N. Moreover, no significant effect was detected on tuber dry matter distribution under different forms of nitrogen applied. Thus, potato nitrogen management including N fertilizer form and its application time should be adjusted according to the aim of commercial potato production or seed potato propagation.
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