Percolation Studies on Denitrification

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Abstract
The importance of the water content in the process of denitrification, and comparison of different measures of denitrification, mutually and with the soil environment, was investigated. An experiment with addition of nitrate to soil columns of different water contents in steady state was carried out. The relationship between nitrate reduction, soil water content, soil organic matter, soil air and denitrifying bacteria is described. Denitrification was correlated with soil water content. There was no clear relation between the number of denitrifying bacteria or easily soluble organic matter and denitrification rate. Blocking the N2O reduction with acetylene could lend the N2O concentrations in the soil air a qualitative value when estimating the amount of denitrification in a given soil.

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