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The effects of irrigation regimes and nitrogen rates on some agronomic traits of canola under a semiarid environment

Author

Listed:
  • Kamkar, B.
  • Daneshmand, A.R.
  • Ghooshchi, F.
  • Shiranirad, A.H.
  • Safahani Langeroudi, A.R.

Abstract

This study was aimed to investigate dual effects of irrigation regimes and N fertilizer rates on some agronomic traits (with emphasis on yield qualitative and quantitative characteristics) and finding optimized irrigation level and N application rate for two canola (Brassic napus L.) cultivars. For this purpose, two variety of canola (Zarfam and Modena), four irrigation regimes including 30%, 45%, 60% and 75% (I1-I4) of maximum allowable depletion (MAD) of available soil water (ASW) and four nitrogen rates (viz. 0, 90, 180 and 270Â kg NÂ ha-1 (N1-N4) were involved in Karaj, Iran for two successive years (2007-2008). Our results revealed special fertilizer threshold for each irrigation regime in respect to seed yield. Response rate to fertilizers was ceased in lower fertilizer rates by prolonging irrigation. The response rate showed a decrease of 15.4%, 17.2% and 30.7% in I2, I3 and I4 in comparison with I1, but I2 response to fertilizer ceased in higher N rate as Ncritical (189.8Â kg NÂ ha-1). This implies that I2 improved response of canola cultivars to N fertilizer, which was accompanied by its higher WUE. Also, all estimated Ncriticals for all irrigation levels were higher than the current recommendation of 130Â kg NÂ ha-1. This show the capability of increasing canola cultivars yield in study region by reasonable increasing of fertilizer rate (decreasing gap between recommended N rate and estimated values) in advisable irrigation regime (I2). Cultivars tended to respond similarly to irrigation and nitrogen for seed yield in both years, but Zarfam was more efficient than Modena in respect to response to diverse treatments.

Suggested Citation

  • Kamkar, B. & Daneshmand, A.R. & Ghooshchi, F. & Shiranirad, A.H. & Safahani Langeroudi, A.R., 2011. "The effects of irrigation regimes and nitrogen rates on some agronomic traits of canola under a semiarid environment," Agricultural Water Management, Elsevier, vol. 98(6), pages 1005-1012, April.
    • Handle: RePEc:eee:agiwat:v:98:y:2011:i:6:p:1005-1012
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    References listed on IDEAS

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    1. Faraji, Abolfazl & Latifi, Nasser & Soltani, Afshin & Rad, Amir Hossain Shirani, 2009. "Seed yield and water use efficiency of canola (Brassica napus L.) as affected by high temperature stress and supplemental irrigation," Agricultural Water Management, Elsevier, vol. 96(1), pages 132-140, January.
    2. Mandal, K.G. & Hati, K.M. & Misra, A.K. & Bandyopadhyay, K.K., 2006. "Assessment of irrigation and nutrient effects on growth, yield and water use efficiency of Indian mustard (Brassica juncea) in central India," Agricultural Water Management, Elsevier, vol. 85(3), pages 279-286, October.
    3. Zhang, Yongqiang & Kendy, Eloise & Qiang, Yu & Changming, Liu & Yanjun, Shen & Hongyong, Sun, 2004. "Effect of soil water deficit on evapotranspiration, crop yield, and water use efficiency in the North China Plain," Agricultural Water Management, Elsevier, vol. 64(2), pages 107-122, January.
    4. Panda, R. K. & Behera, S. K. & Kashyap, P. S., 2004. "Effective management of irrigation water for maize under stressed conditions," Agricultural Water Management, Elsevier, vol. 66(3), pages 181-203, May.
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    1. Hergert, G.W. & Margheim, J.F. & Pavlista, A.D. & Martin, D.L. & Supalla, R.J. & Isbell, T.A., 2016. "Yield, irrigation response, and water productivity of deficit to fully irrigated spring canola," Agricultural Water Management, Elsevier, vol. 168(C), pages 96-103.
    2. Nosheen Noor Elahi & Sadia Raza & Muhammad Shahid Rizwan & Bedur Faleh A. Albalawi & Muhammad Zubair Ishaq & Hafiz Munir Ahmed & Sajid Mehmood & Muhammad Imtiaz & Umer Farooq & Muhammad Rashid & Allah, 2022. "Foliar Application of Gibberellin Alleviates Adverse Impacts of Drought Stress and Improves Growth, Physiological and Biochemical Attributes of Canola ( Brassica napus L.)," Sustainability, MDPI, vol. 15(1), pages 1-13, December.
    3. Hergert, G.W. & Margheim, J.F. & Pavlista, A.D. & Martin, D.L. & Isbell, T.A. & Supalla, R.J., 2016. "Irrigation response and water productivity of deficit to fully irrigated spring camelina," Agricultural Water Management, Elsevier, vol. 177(C), pages 46-53.

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