不同小麦品种钾吸收,分配特性及其钾营养效率的差异

盆栽试验结果表明，钾效率系数（ＥＩ）和施外效率（ＫＥ）能很好评价小麦品种在钾缺乏条件下的钾营养效率，钾高效品种能在缺钾条件下区得较高产量；钾低效品种ＥＩ值小，但ＫＥ值大，施钾能获主产；押高效品种在钾缺乏或充足条件下均能维持功能叶（３～４叶）中较主的钾含量，功能叶中（第３～４叶）钾钾高效品种籽粒中甸积累量及其占总量的自分数较高，钾你效品种植物功能叶中的钾含量低效，茎、叶、叶间钾钾高效品种籽粒中钾积累

Variation among Wheat Varieties in Characteristics of Potassium Uptake and Distribution, and Potassium Nutrition Efficiency

A pot culture experiment was conducted to study the difference among 3 wheat varieties in characteristics of potassium uptake and potassium nutrition efficiency under 2 potassium levels condition. Relative yield in check treatment (EI) and potassium efficiency in increasing biomass or grain yield (KE) were adopted to evaluate the potassium nutrition efficiency of three wheat varieties under potassium deficiency and sufficiency condition, respectively. The EI value of high potassium efficiency (HKE) wheat variety was higher than low potassium efficiency (LKE) variety, and the former could endure low soil available potassium to produce more yields, but the latter had larger KE value and higher increase rate of grain yield by application of potassium fertilizer. The potassium content of HKE wheat functional leaves (3 d-4th leaf from top of plant) was higher than the LKE wheat, and the HKE wheat variation in potassium content between functional leaf and heart-1st leaf was larger than the LKE.The results also showed that the variation among wheat varieties in potassium nutrition efficiency was not due to the total potassium amount accumulated by plant, but to the distribution and movement of potassium in plant.