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Yield response of wheat (Triticum aestivum L.) to deficit and regulated deficit irrigation under arid/semi-arid conditions
Author(s)
Wajid Ishaque Nuclear Institute for Agriculture and Biology (NIAB), Faisalabad, Pakistan; Government College University, Faisalabad, Pakistan
Farhat Abbas Government College University,Faisalabad,Pakistan
Shafaqat Ali Government College University,Faisalabad,Pakistan
Khalid Mahmood Nuclear Institute for Agriculture and Biology (NIAB),Faisalabad,Pakistan
Qamar Zaman Dalhousie University,Truro,Canada
Muhammad Azam Institute of Horticultural Sciences, University of Agriculture,Faisalabad,Pakistan
Imran Khan Departmen of Agronomy, University of Agriculture,Faisalabad,Pakistan
Muhammad Zain Departmen of Agronomy, University of Agriculture,Faisalabad,Pakistan
Abstract
The objective of present research was to devise irrigation management techniques/practices for improved water use efficiency (WUE) and optimum wheat yield in water scarce conditions. Investigations with different irrigation regimes including: optimal, deficit (DI) and regulated deficit irrigation (RDI) at different crop growth stages were carried out on a deep loam soil for four crop seasons (2010-2014). The results showed that early vegetative/ crown root initiation followed by flowering/anthesis stage are highly sensitive to soil moisture stress and irrigation stress at these stages may reduce the yield from 12 to 20%. However, deficit applied at late vegetative/booting stage may provide an opportunity to save irrigation water with relatively lower grain yield reduction (9%), higher harvest index (2%) and grain based water use efficiency (WUEg; 10%). The lower value of water production functions (ky = 0.51 ) in the treatment with water stress at booting/late vegetative growth stage also indicated recovery of the crop from stress, exhibiting less than proportional reductions in yield with reduced water use. Regulated deficit irrigation (50% of the crop water requirement) at grain formation may result in comparatively lower yield reduction (-6%) relative to full irrigation skipped at booting, the reduction in harvest index (-3%) without any substantial increase in WUEgmade it uneconomical.
Publication Details
Page(s) 135-144
DOI 10.21162/PAKJAS/17.5395
Published Journal: Pakistan Journal of Agricultural Sciences, Volume: 54, Issue: 1, Year: 2017
Keywords
Wheat Water scarcity soil moisture water use efficiency yield response factor
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