Changes of Nutrient Absorption,Yield and Quality in Solanum tuberosumL.under Different Potassium Levels

In order to study the changes of nutrient absorption,yield and quality in Solanum tuberosum L.under different potassium levels,a field experiment with randomized block design was conducted,including 3 potassium treatments(K1:0kg/ha,K2:75.00kg/ha,and K3:112.50kg/ha)and 3 replications.The results showed that the dry matter accumulation of Solanum tuberosum L.was the highest in K3 treatment,which was 42.16% and 37.29% higher than K1 and K2,respectively;the nitrogen uptake of K1,K2and K3 treatments reached to 220.39,235.31 and 306.46kg/ha in harvest;the phosphorus uptake of K3was 20.38% higher than that of K2in harvest;and the potassium uptake of K3 treatment reached to 204.48kg/ha in harvest,64.44% and 26.14% higher than K1and K2,respectively.K3 treatment had the highest yield,increased by 97.48% and 44.47% compared to K1and K2.With the increase of potassium amount,the content of reducing sugar increased,while the vitamin C decreased.The results suggested that the optimum amount of potassium fertilizer was 112.50kg/ha for potato in Heilongjiang.