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EFFECTS OF CO₂, CH₄ AND N₂ ON GROWTH AND NUTRITION OF RICE SEEDLINGS

D. NIRANJAN RAO and D. S. MIKKELSEN
Plant and Soil
Vol. 47, No. 2 (JUNE 1977), pp. 313-322
Published by: Springer
Stable URL: http://www.jstor.org/stable/42933518
Page Count: 10
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EFFECTS OF CO₂, CH₄ AND N₂ ON GROWTH AND NUTRITION OF RICE SEEDLINGS
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Abstract

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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