African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6574

Full Length Research Paper

Irrigation withholding time management in four rice varieties at Guilan paddy fields (North Iran)

Naser Mohammadian Roshan*, Maral Moradi, Ebrahim Azarpour and Hamid Reza Bozorgi
Department of Agriculture, Lahijan Branch, Islamic Azad University, Lahijan, Iran.
Email: [email protected]

  •  Accepted: 15 May 2013
  •  Published: 29 May 2013


In order to determine the best irrigation withholding time in four varieties of rice, an experiment in factorial statistical format based on complete randomized block design was conducted. This experiment took place in National Rice Research Institute situated in Rasht township (Guilan province, North Iran) in 2008. First factor included four rice varieties (v1 = Khazar, v2 = Sepeed Roud, v3 = Hassani, and v4 = Binaam). The second factor included three drought periods (d1 = 1 week after flowering, d2 = 2 weeks after flowering, and d3 = 3 weeks after flowering). The statistical analysis results almost in most measured traits showed significant difference at 1% probability level. The highest grain yield of 5635.8 kg/ha was obtained of Sepeed Roud variety. Also, the interaction effect of V2dwith 6000 kg/ha was recorded the maximum grain yield. But since one of the goals for conducting this study was to determine a variety with short-water-necessity period in water deficiency years of cultivation, it is recommended that V2dlevel with grain yield of 5325 Kg/ha be used even though it has a lower yield.


Key words: Rice varieties, irrigation withholding time, yield, yields components, Iran.