تأثیر تنش‌خشکی و محلول‌پاشی پتاسیم بر میزان، درصد وکارایی انتقال مجدد مواد سه رقم گندم نان

In order to evaluate the effect of drought stress and potassium foliar application on dry matter accumulation and remobilization in grain wheat (Triticum aestivum L.) cultivars, an experiment was conducted in 2011-2012 at Seed and Plant Certification and Registration Research Institute (SPCRI), Karaj- Iran. The experiment was carried out using a split plot factorial based on a randomized complete blocks design with three replications. The water treatments included three irrigation regimes; normal, mild stress (warer withhold at the grain filling phase) and severe stress (water withhold at the ear emergence phase); potassium foliar treatments included, 0, 1.5% and 3.0% K2O applications and three wheat cultivars (Marvdasht, Pishtaz and WS-82-9). The results showed that water stress significantly increased amounts of remobilized dry matter, remobilization efficiency and remobilization percentage compared with normal conditions. Foliar application of potassium at the rate of 3.0% K2O gave the highest values of all studied wheat characters as compared with control treatment. Marvdasht cultivar had the lowest values of the above mentioned characters as compared with the two other cultivars.