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The limiting factor in nitrogen fixation of soil isA. soil natrure (pH)B. lightC. temperatureD. air |
Answer» Correct Answer - A Extreme of soil pH affects nodulation by reducing the colonisation of soil and the legume rhizosphere by rhizobia. Highly acidic soils `(pH lt 4.0)` frequently have low levels of phosphorus, calcium and molybdenum and high concentration of toxic elements while highly alkaline soils `(pH gt 8.0)` tend to be high in sodium chloride, bicarbonate and borate, and are often associated with high salinity which reduce nitrogen fixation. |
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