African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Impact of precipitation pattern on forage production in Pashylogh Rangeland, Iran

Abdultaher Mirzaali1*, Hossin Arzani2, Mohammad Jafari2, Ali Ehsani3, Jamshid Khatirnamani4 and Idris Mirzaali5
1Department of Range Management, Science and Research Branch, Islamic Azad University, Tehran, Iran. 2Department of Natural Resources, Tehran University, Tehran, Iran. 3Research Institute of Forest and Rangelands, Tehran, Iran. 4Research Institute of Forest and Rangelands, Gorgan, Iran. 5Department of Agriculture, Gorgan Branch, Islamic Azad University, Gorgan, Iran.
Email: [email protected]

  •  Accepted: 02 August 2011
  •  Published: 12 September 2011

Abstract

The responses of four steppe forage species in the Pashylogh rangeland to precipitation timing were assessed for a period of 7 years (2003 to2007 and 2009 to 2010). Regression analysis was used to examine the relationship between annual production and different periods of precipitation. Annual yields of the different steppe forage species responded differently to the periods of precipitation. Precipitation during November to December and April to May gave the highest predictor of total forage production (r2= 0.80). Annual productivity of Salsola arbosculoformis was most closely correlated with precipitation in November to December and April to May (r= 0.86), Artemisia seiberi with November to January (r= 0.68), Salsola tomentosa in January (r= 0.72) and Astragalus podolobus with from the end of the growing season in previous year and the new growing season (r2 = 0.88). This study supported the use of seasonal period precipitation instead of annual precipitation in effectively estimating the herbage production through a statistical model.

 

Key words: Precipitation, forage, yield, Pashylogh.