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  4. The limiting factor in nitrogen fixation of soil is

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Q. The limiting factor in nitrogen fixation of soil is

UP CPMTUP CPMT 2010Mineral Nutrition

Solution:

Extreme of soil $pH$ affects nodulation by reducing the colonisation of soil and the legume rhizosphere by rhizobia. Highly acidic soils $(pH < 4.0)$ frequently have low levels of phosphorus, calcium and molybdenum and high concentration of toxic elements. While highly alkaline soils $(pH > 8.0)$ tend to be high in sodium chloride, bicarbonate and borate, and are often associated with high salinity which reduce nitrogen fixation.