Based on the previous research results on potato plant nutrient requirements,the amount of nutrient demands for harvesting 1 000 kg of tubers and the possible factors which influence the values were discussed and evaluated.The results indicated that 3.0-4.0 kg N,1.00-1.50 kg P2O5 and 4.0-6.0 kg K2O were needed for producing 1 000 kg of tubers,and the factors influencing the nutrient requirements included soil organic matter content,soil pH,years and yields.Understanding fertilizer requirement of unit yield ...