关键词: 马铃薯, 产量, 钾高效, 耐低钾, 水分含量, 淀粉含量

Abstract: Pot experiment was carried out to study potassium nutrition characteristics of 28 potato strains. The results indicated that potassium nutrition influenced tuber yield, water content and starch content significantly:low potassium decreased tuber yield and water content significantly, while starch content was different according to strains. Among tested strains, the yield of N6-22 per plant was highest significantly, as well as Zhongnong Ⅷ-1, J-aba, Yihong pi, 971-12 and Zhongnong Ⅷ-3 were higher significantly than the average under low-potassium stress. Therefore, these strains have highest potassium efficient. Low-potassium tolerance strains included 6 strains presented by Zhongnong Ⅷ-2, Gaoyuan 7 and Mira, and their relative yield was more than 95% under low-potassium stress. The study also suggested that the reduction of tuber yield caused by low-potassium stress was mainly related to the decrease of water content in tuber.

Key words: potato, yield, potassium efficiency, low-potassium tolerance, water content, starch content