The effect of soil gas‐phase CO2 concentration on Fe‐deficiency chlorosis of soybean and sorghum grown in calcareous soils

Abstract Environmental conditions such as high soil‐moisture content and/or high soil gas‐phase CO2 concentration have been implicated in the enhancement of Fe‐deficiency chlorosis. Also, the influence of HCO3‐ in the incidence of Fe chlorosis of susceptible plants has been confirmed in past studies in solution culture. The objectives of this study were to observe the effects of CO2 concentration of the soil gas phase on: (1) the equilibrium relations of the soil solution, and (2) the growth of Fe‐chlorosis susceptible sorghum and soybean cultivars. Plants were grown in specially designed chambers to enable the control of soil gas‐phase composition. There were decreases in pH and increases in soil gas‐phase HCO3‐ concentration. However, increases in CO2 concentration of the soil gas phase up to 11.0 cmol mol‐1 had no significant effect on chlorosis of either sorghum or soybean. The favorable influence of decreasing soil‐solution pH had probably offset the detrimental influence of increasing soil solution ...

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