Analysis on Dry Matter Accumulation and Nitrogen,Phosphorus and Potassium Nutrition Characteristics of Feiwuruita(a Potato Variety)

Feiwuruita,a potato variety with free-virus,was tested to investigate effects of dry matter accumulation on absorption,accumulation and distribution of nitrogen,phosphorus and potassium nutrients.The results showed that the fastest stage of absorbing nutrients of roots,stems and leaves was at the seedling stage,the main period of absorbing nutrients of tubers with the faster rate of nutrient absorption was between the bud stage and wilt stage of stems and leaves.Because the growth peak of its stems and leaves occurred early,its tuber formation and growth,and starch accumulation period happened early,which could get the higher economic yield by increasing the period and efficiency of photosynthesis in spite of its short growth period.The absorption ratio of N∶P2O5∶K2O was 1∶0.133∶1.666,that is,the absorption amount of N,P2O5 and K2O for formantion of 500 kg tuber was 1.654 kg,0.221 kg and 2.756 kg respectively.