不同马铃薯品种(系)钾营养特性的差异

采用盆栽试验研究了28个马铃薯品种(系)的钾营养特性。结果表明:钾营养对块茎产量、水分含量和淀粉含量均存在显著影响:低钾显著降低了马铃薯块茎产量和块茎水分含量,而对淀粉含量变化因品种(系)而异。本实验筛选得到:在低钾下,N6-22的单株产量极显著高于供试品种(系)的平均值,中农Ⅷ-1、J-阿坝、疫红皮、971-12和中农Ⅷ-3显著高于平均值,以上6个品种(系)为钾高效品种(系);中农Ⅷ-2、高原七号、米拉等6个品种(系)低钾相对产量均大于95%,为耐低钾品种(系)。研究还表明,低钾胁迫导致马铃薯块茎产量的降低,主要与块茎内水分含量的减少有关。

Potassium Nutrition Characteristics of Different Potato Strains

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,Yihongpi,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.