Journal of
Soil Science and Environmental Management

  • Abbreviation: J. Soil Sci. Environ. Manage.
  • Language: English
  • ISSN: 2141-2391
  • DOI: 10.5897/JSSEM
  • Start Year: 2010
  • Published Articles: 314

Full Length Research Paper

Dried Azolla pinnata as a supplementary nitrogen source for lowland rice production in a Calcic Natraquert

Agbagba G.
  • Agbagba G.
  • Department of Soil Science, College of Basic and Applied Sciences, University of Ghana, Legon, Ghana.
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Asuming-Brempong S.
  • Asuming-Brempong S.
  • Department of Soil Science, College of Basic and Applied Sciences, University of Ghana, Legon, Ghana.
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Lawson I. Y. D
  • Lawson I. Y. D
  • Department of Soil Science, College of Basic and Applied Sciences, University of Ghana, Legon, Ghana.
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  •  Received: 13 September 2016
  •  Accepted: 24 October 2017
  •  Published: 31 March 2018

Abstract

A pot experiment was conducted in the experimental field of the University of Ghana, Legon to examine the effectiveness of dry Azolla as N source in flooded rice field. The treatments included incorporating fresh Azolla (FA at 90 kg N/ha), dry Azolla (DA at 90 kg N/ha), dry Azolla  + Ammonium sulphate  (DA at 45 kg N/ha + AS at 45 kg N/ha), fresh Azolla + dry Azolla (FA at 45 kg N/ha  + DA at 45 kg N/ha), ammonium sulphate (AS at  90 kg N/ha) and a control (C at 0 kgN/ha). The treatments were applied 8 days after transplanting rice. Results showed that the DA + AS treatment, that is, the treatment where dry Azolla + ammonium sulphate were used to fertilize the rice had the highest dry weight and total N yield followed by the treatment AS. Total N for the DA + AS treatment was 36.67% over the control whilst that for the AS was 25% over the control. Dry Azolla has the potential for supplementing for the nitrogen requirement for irrigated rice.

Key words: Azolla, tiller number, total N.

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