Analysis on Dry Matter Accumulation and Nitrogen,Phosphorus, Potassium Nutrition Characteristics of Potato Atlantic

Free-virus potato seed were used to investigate the dry matter accumulation and nitrogen,phosphorus,potassium nutrition characteristics of Atlantic by pot experiment.The result showed that the plant grew rapidly during the earlier growing stage,and the tuber emergence was early.The accumulation rate of root was fastest in bud stage while stems and leaves were in squaring stage and tuber was in flowering stage with the same trends of absorption and accumulation of nutrition.During the earlier growing stage,dry matter and nutrition distributed main in leaves.With the development of plant and the tuberization and expansion,the distribution in tuber ascended and reached over 80%.The relativity of accumulation of dry matter,nitrogen,phosphorus,potassium and the days after emergence for Atlantic can well fitted with trinomial function.The absorption ratio of nitrogen,phosphorus and potassium of Atlantic were nitrogen(N)∶phosphorus(P2O5)∶potassium(K2O) = 1∶0.175∶2.142,that is,the absorption amount of N,P2O5,and K2O for formantion of 500 kg tubers was(N)1.609 kg,phosphorus(P2O5) 0.281 kg and potassium(K2O) 3.445 kg respectively.