The influence of previous plant cultivation on soil nitrification

Summary Studies have been made on the effect of previous cultivation of different plants on soil nitrification. Greater effects were obtained when the soil was incubated at 29°C and under natural conditions in the open that at 18°C. The rate of nitrification was usually lower in previously uncultivated than cultivated soils except in the cases of pea, timothy grass and onion when increased rates were found.