Analysis of Dry Matter Accumulation and Nitrogen, Phosphorus, Potassium Nutrition Characteristics of Potato Cultivar Hui-2

Free-virus potato seed were used to investigate the dry matter accumulation and nitrogen, phosphorus, potassium nutrition characteristics of Hui-2, a high yield potato cultivar. The result showed that the nitrogen (N), phosphorus (P2O5) and potassium (K2O) absorption rate in the leaves were kept paces with the dry matter accumulation rate which showed a double-peak curve , the peak appeared during the seedling to squaring stage and full flowering to late flowering stage respectively. The dry matter accumulation and nutrition absorption had a single-peak curve in the tubers and the peak appeared in wilting stage. Full-bloom stage to wilting stage was the main stage of dry matter formation and nutrition accumulation. Before the final flowering stage, the distribution of dry matter and nutrition in leaf was larger than in tuber, after that, the trend was reverse. The absorption ratio of nitrogen, phosphorus and potassium of Hui-2 were nitrogen (N)∶ phosphorus (P2O5)∶potassium (K2O) = 1∶0.140∶1.919, that is, the absorption amount of N, P2O5, and K2O for formation of 500 kg tubers was (N) 2.756 kg, phosphorus (P2O5) 0.310 kg and potassium (K2O) 4.256 kg respectively.