Summary
Oryza sativa Loisel cultivar Mars., a common lowland rice variety was grown under controlled soil redox conditions (Eh) and acidity (pH). The effect of two variables (Eh and pH) on growth, anaerobic root respiration, and uptake of added labelled nitrogen, was investigated. Plant growth, estimated by dry weight showed significantly higher growth under reducing sediment redox potentials (−200 mV and 0 mV) and at a soil pH of 6.5 Using the activity of the inducible enzyme alcohol dehydrogenase (ADH) as an indicator of anaerobic root respiration, a decrease in redox potential resulted in an increase in root ADH. However, growth paralled increases in anaerobic root respiration suggesting nitrogen transformation in the soil to be a primary parameter governing growth. Labelled nitrogen uptake which was greater under anaerobic conditions apparently led to greater growth of lowland rice in the highly reduced or anaerobic soil treatments.
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Tolley, M.D., Delaune, R.D. & Patrick, W.H. The effect of sediment redox potential and soil acidity on nitrogen uptake, anaerobic root respiration, and growth of rice (Oryza sativa). Plant Soil 93, 323–331 (1986). https://doi.org/10.1007/BF02374283
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DOI: https://doi.org/10.1007/BF02374283