Crop Science Research in Arid Regions

Crop Science Research in Arid Regions

The effects of drought stress on grain and oil yield of two cultivars of sunflower

Document Type : Original Article

Authors
Parviz Yadollahi 1
Mohammad Reza Asgharipour 2
Hashem Marvaneh 3
Noralah Kheiri 4
Ayub Amiri 5
1 Islamic Azad University - Shahrekord Branch, Shahrekord, Iran
2 Department of Agronomy, College of Agriculture, University of Zabol, Zabol, Iran
3 Islamic Azad University - Jiroft Branch, Jiroft, Iran
4 Islamic Azad University - Gorgan Branch, Gorgan, Iran
5 Islamic Azad University - Manoujan Branch, Manoujan, Iran
10.22034/csrar.01.01.06
Abstract
An experiment was conducted to examine the effects of drought stress on two cultivars of sunflower as split plot randomized complete block design at Agricultural Research Center of Khorramabad during 2013 with three replications. Treatments were irrigation at depletion of 25, 50, 75 and 100 available soil water comprising main-plots and two cultivars of sunflower (Record and Alster) as subplots. Drought affected head diameter, grain number per head, 1000 grain weight, core percentage of grain, grain and oil yield and harvest index. Grain yield of Record and Alster at no stress condition were 3359.10 and 3869.35  Kg/ha, respectively and oil yield was 1685.88 and 1818.10 Kg/ha, respectively. Grain yield of Record and Alster at the strongest drought decreased by 45.31 and 62.35%, respectively and oil yield decreased by 49.50 and 60.88 %, respectively. In addition to head diameter, 1000 grain weight and grain number per head significantly decreased at stress condition, led to grain yield decreasing. This results suggested that Alster at stress free condition and Record at stress condition has greater grain yield and drought resistance.

Keywords
Cultivar
Oil Plants
Partial Irrigation
Yields

  • Receive Date 03 August 2016
  • Revise Date 27 September 2016
  • Accept Date 24 November 2016