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Optimising supplemental irrigation for wheat (Triticum aestivum L.) and the impact of plant bio-regulators in a semi-arid region of Deccan Plateau in India

Author

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  • Wakchaure, G.C.
  • Minhas, P.S.
  • Ratnakumar, P.
  • Choudhary, R.L.

Abstract

Understanding the effects of water stress on yield formation is essential for planning irrigation and other mitigation strategies in arid and semiarid regions. Therefore, a field experiment was conducted for 3 years to evaluate the impact of irrigation regimes and plant bio-regulators (PBR’s) on grain yield and water productivity of spring wheat (Triticum aeastivum L). PBR’s applied through exogenous sprays included: 10mM thiourea (TU), 10μM salicylic acid (SA), 15gL−1 potassium nitrate (KNO3), 25ppm gibberellic acid (GA3), 8ppm ortho-silicic acid (OSA) at crown root initiation (CRI), flag leaf and seed milking stages and control (no PBR). Seven irrigation levels were generated through a line source sprinkler system (LSS) viz., application of irrigation water (IW) equalling 1.0, 0.85, 0.70, 0.55, 0.40, 0.25 and 0.10 times the CPE (cumulative open pan evaporation). The maximum yield obtained with PBR’s varied between 4.11–4.46Mgha−1 at IW:CPE 0.85 against 4.09Mgha−1 without PBR. While the yield decline equalled 0.35–0.42Mgha−1 for every 0.1 IW:CPE for PBR’s against 0.43Mgha−1 without PBR. The overall improvement in grain yield and total biomass with PBR’s ranged between 5.9–20.6% and 4.8–15.3%, respectively. Specifically TU and SA showed a major role under medium (IW:CPE 0.40–0.69) and severe (0.10–0.39) stress conditions in terms of maintenance of leaf water content, modulating the stomatal opening and better water usage and thereby improved yield by 0.41–0.88Mgha−1. The maximum water productivity ranged between 1.20–1.35kgm−3 with different PBR’s while it was 1.18kgm−3 without PBR and the latter could be achieved with 19–56% lesser irrigation water with PBR’s. Overall conclusions are that the effects of deficit irrigation could be substantially enhanced in terms of grain yield and water productivity when used conjunctively with PBR’s like TU and SA. Thus for integrating PBR’s with supplemental irrigation, large scale testing is required for defining their economic spray schedules under water scarcity conditions.

Suggested Citation

  • Wakchaure, G.C. & Minhas, P.S. & Ratnakumar, P. & Choudhary, R.L., 2016. "Optimising supplemental irrigation for wheat (Triticum aestivum L.) and the impact of plant bio-regulators in a semi-arid region of Deccan Plateau in India," Agricultural Water Management, Elsevier, vol. 172(C), pages 9-17.
    • Handle: RePEc:eee:agiwat:v:172:y:2016:i:c:p:9-17
    DOI: 10.1016/j.agwat.2016.04.004
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    4. Wakchaure, G.C. & Minhas, P.S. & Kumar, Satish & Khapte, P.S. & Meena, K.K. & Rane, Jagadish & Pathak, H., 2021. "Quantification of water stress impacts on canopy traits, yield, quality and water productivity of onion (Allium cepa L.) cultivars in a shallow basaltic soil of water scarce zone," Agricultural Water Management, Elsevier, vol. 249(C).
    5. Ali, Shahzad & Jan, Amanullah & Manzoor, & Sohail, Amir & Khan, Ahmad & Khan, Muhammad Ijaz & Inamullah, & Zhang, Jiahua & Daur, Ihsanullah, 2018. "Soil amendments strategies to improve water-use efficiency and productivity of maize under different irrigation conditions," Agricultural Water Management, Elsevier, vol. 210(C), pages 88-95.
    6. Agossou Gadedjisso-Tossou & Tamara Avellán & Niels Schütze, 2019. "An Economic-Based Evaluation of Maize Production under Deficit and Supplemental Irrigation for Smallholder Farmers in Northern Togo, West Africa," Resources, MDPI, vol. 8(4), pages 1-11, November.
    7. İsmail Sezer & Hasan Akay & Zeki Mut & Hakan Arslan & Elif Öztürk & Özge Doğanay Erbaş Köse & Mehmet Sait Kiremit, 2021. "Effects of Different Water Table Depth and Salinity Levels on Quality Traits of Bread Wheat," Agriculture, MDPI, vol. 11(10), pages 1-13, October.
    8. Wakchaure, G.C. & Minhas, P.S. & Meena, Kamlesh K. & Singh, Narendra P. & Hegade, Priti M. & Sorty, Ajay M., 2018. "Growth, bulb yield, water productivity and quality of onion (Allium cepa L.) as affected by deficit irrigation regimes and exogenous application of plant bio–regulators," Agricultural Water Management, Elsevier, vol. 199(C), pages 1-10.

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