Abstract
AbstractIn order to study effect of zeolite soil application and selenium foliar application on growth, yield and yield components of three canola cultivar under conditions of late season drought stress an experiment was conducted in two growing season in 2006 and 2007. Site study was field of Seed and Plant Improvement Institute, Karaj, Iran. The experimental design was a Randomized Complete Block arrangement in factorial split plot with three replications. Irrigation factors were chosen at two levels, included complete irrigation and irrigation holding at stem elongation stage. Zeolite was used at two levels, non application and 10 ton per hectare. Also selenium was sprayed at three concentrations, 0, 15 and 30 gr per liter from sodium selenate. These treatments were randomized in main plots while three canola cultivars (‘Zarfam’, ‘Okapi’ and ‘Sarigol’) were randomized in sub plots. The results showed that, main effects of different irrigation levels have significant effect on all traits and drought stress decreased significantly all traits. Foliar application of selenium had significant and additive effect on plant height, number of pods in plant, number of seeds in pod, seed yield, biological yield, harvest index and oil yield. There was significant difference between zeolite application and non application on all traits except oil percent and harvest index. It was shown that canola cultivars were different in all of studied traits. Comparison of means showed that, four critical traits that is seed yield, biological yield, harvest index and oil yield were affected by experimental treatments. Different cultivars have different responses under unlike conditions inside upon traits. Under different treatment conditions especially drought stress, zeolite and selenium application have positive and significant effect on traits related to yield. In finally, zeolite and selenium application in dry lands that are exposure to late season drought stress can be helpful for yield improvement and prevent of decreasing yield.
Highlights
In many region of the world among Iran, drought stress is one of the most important factors that decrease agricultural crop production
Responses of two canola cultivars to drought stress have been studied by Wright et al (1995) they shown that, seed yield and oil percentages were strongly affected by drought stress
Effects of different irrigation regimes at flowering stage on canola has been studied by Deepak, and Wattal (1995) their results showed that water stress decreased significantly seed yield and biological yield
Summary
In many region of the world among Iran, drought stress is one of the most important factors that decrease agricultural crop production. Late season drought stress and increase of temperature during flowering and seed filling stages decreases canola yield. The results of researchers shown that, in many plants flowering, pollination and seed filling are sensitive stages to drought stress (Thomas et al, 2004; Liu et al, 2004). Responses of two canola cultivars to drought stress have been studied by Wright et al (1995) they shown that, seed yield and oil percentages were strongly affected by drought stress. Effects of different irrigation regimes at flowering stage on canola has been studied by Deepak, and Wattal (1995) their results showed that water stress decreased significantly seed yield and biological yield. Decrease of biological yield and pod dry matter has been observed in two canola cultivars under conditions of water deficit (Wright, et al, 1998)
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