Fertilizer research

, Volume 45, Issue 2, pp 135–142 | Cite as

Response of dryland wheat to supplemental irrigation and rate and method of N application

  • K. S. Sandhu
  • A. S. Sidhu
Article

Abstract

A field experiment was conducted on dryland wheat (Triticum aestivum L.cv PBW 175) for four years on a sandy loam soil to evaluate the effect of supplemental irrigation in combination with rate and method of fertilizer N application. The experiment was a split-split plot design consisting of three irrigation treatments (rainfed, one preseeding irrigation and one preseeding + one postseeding irrigation) in the main plot: four fertilizer N rates (0, 40, 80 and 120 kg ha−1) in the sub-plot and two methods of N application (drilled at the time of seeding and broadcast before preseeding irrigation) in the sub-sub plots. The crop response to supplementary irrigation(s) depended on the growing season water deficits. Broadcasting fertilizer N before preseeding irrigation resulted in the transporting of 39 per cent of the applied N to the sub-soil (20-60 cm depth). This resulted in better crop performance, particularly under low water supplies. A step wise regression was developed that showed water supplies beyond 26 cm of available water plus irrigation/rainfall from seeding to 45 days after were not productive and its distribution between pre- and post-fertilizer application periods affected water and applied N efficiencies. For higher crop yields under low water supply the fertilizer N broadcast before preseeding irrigation is suggested.

Key words

fertilizer N broadcast before preseeding irrigation N drill nitrogen - water interaction water supply pattern-N method - yield relations 

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • K. S. Sandhu
    • 1
  • A. S. Sidhu
    • 1
  1. 1.Department of SoilsPunjab Agricultural UniversityLudhianaIndia

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