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This article in AJ

  1. Vol. 104 No. 2, p. 448-457
     
    Received: Aug 20, 2011
    Published: Mar, 2012


    * Corresponding author(s): kaleemabbasi@yahoo.com
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doi:10.2134/agronj2011.0267

Yield and Nitrogen Use Efficiency of Rainfed Maize Response to Splitting and Nitrogen Rates in Kashmir, Pakistan

  1. M. Kaleem Abbasi *,
  2. Majid Mahmood Tahir,
  3. Andlib Sadiq,
  4. Mussawar Iqbal and
  5. Mohsin Zafar
  1. Dep. of Soil and Environmental Sciences, Univ. of Azad Jammu and Kashmir, Faculty of Agriculture, Rawalakot, Azad Jammu and Kashmir, Pakistan

Abstract

Efficient use of N for maize (Zea mays L.) production is an important management strategy for increasing crop yield and improving N use efficiency (NUE). A 2-yr (2007 and 2008) field experiment was conducted to evaluate the effect of timing and rate of N application on growth and yield, N uptake, and NUE of rainfed maize. The experiment was a randomized complete block design with split-plot arrangement using three replications. Treatments consisted two application timings—full dose of N at planting or a split application, with half at sowing and half at V6 stage—and seven N rates of 30, 60, 90, 120, 150, 180, and 210 kg N ha−1 and a control. Results indicated that N fertilization increased straw yield by 34 and 27% and grain yield by 88 and 80% in 2007 and 2008, respectively, over the control. The maximum grain was recorded for 180 kg N ha−1. Splitting N did not show a significant effect in 2007 but displayed a significant increase in both straw and grain yield (6%) over full N application in 2008. The maximum N uptake ranged between 122 and 139 kg N ha−1 and required 180 kg N ha−1 (except split application in 2007). Splitting of N significantly increased N uptake by 6 and 13% (2007 and 2008, respectively). The maximum NUE was observed between 68 and 70% at 90 kg N ha−1 and there was a general trend of decreasing NUE with increasing N rates. Splitting N increased NUE by 14% (2008). Results of this experiment showed that application of 180 kg N ha−1 in split applications is a successful and sustainable management strategy for maize production in rainfed mountainous ecosystems.

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Copyright © 2012. Copyright © 2012 by the American Society of Agronomy, Inc.