Abstract
The effect of acid leaching on the microbial activity in soil, was studied by simultaneous measurements of heat production using microcalorimetry and of carbon dioxide evolution employing gas chromatography. As the activity decreased after acid leaching, attempts were made to restore the soil, i.e. increase the microbial activity to a normal level again. This was performed by increasing the pH of the soil and by different additions to the soil. As judged by calorimetry, significant, but not complete, restoration was obtained. The results from the C02-measurements indicate complete restoration. The differences in results could partly be explained by the fact that some of the CO2 evolved from soil may have nonbiological origin.
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