Summary
Flooded soils, which accumulate gaseous products of anaerobic fermentation, are often associated with poor rice plant growth. In the present experiment the effects of CO2, CH4, N2, and air on rice seedling growth and nutrition were evaluated. Nutrient culture techniques were used to avoid secondary soil effects normally experienced.
Carbon dioxide gas in the root zone of rice reduced seedling growth significantly, whereas CH4 and N2 had no significant effect. Methane gave no stimulatory benefits, unlike results reported by some earlier workers. Of three major nutrient elements studied, P uptake was affected more than N or K. Phosphorus uptake was significantly reduced in leaves and sheaths by all three gases, but was significantly increased in roots. This suggests an immobilization mechanism affecting P in roots, and since CO2, CH4, and N2 behaved similarly in contrast to air, a lack of oxygen in the root system is suspected as the causal mechanism rather than toxic effects of gases. Effects on N and K uptake were minimal and insignificant.
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Contribution from the Department of Agronomy and Range Science, University of California, Davis, California 95616.
Contribution from the Department of Agronomy and Range Science, University of California, Davis, California 95616.
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Rao, D.N., Mikkelsen, D.S. Effects of CO2, CH4 and N2 on growth and nutrition of rice seedlings. Plant Soil 47, 313–322 (1977). https://doi.org/10.1007/BF00011490
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DOI: https://doi.org/10.1007/BF00011490