Nitrogen fertilizer is one of the key factors limiting the high yield of potato.At present,the application of nitrogen fertilizer in potato production lacks scientific guidance,and there are widespread phenomena such as excessive nitrogen supply,unreasonable form combination and backward supply mode,which seriously restrict the high yield and efficient production of potato.In this review,the effects of nitrogen supply on tuber formation and development were discussed,and the effects of nitrogen on the initiation of potato stolons,the formation time,quantity and weight of tuber were summarized.Under low nitrogen conditions,tuber initiates early,but the sink is strong and the source is weak,leading to low incidence of stolon,high incidence of tuber death,and low number and weight of potato tuber per plant.Excessive nitrogen supply inhibits the development of stolons,delays the formation time of tubers,and reduces the number and weight of tubers.The supply of suitable nitrogen is conducive to the formation of high yield.The reasons may be that the tip of stolons expands early to form tubers,the incidence of tuber death is low,and the number and weight of tubers per plant increases.Previous researchers have done a lot of work on the regulation of potato tuber development regarding reasonable nitrogen supply,but due to different climatic factors,soil physicochemical properties,main varieties and production purposes,the threshold values are different either.These remain to be further explored.
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