Abstract
Summary In a long-term field experiment for the purpose of an intensive analysis of the correlation between weather conditions, crops and soil biological processes, the activity of two transaminases — aspartate amino transferase (GOT) and alanin amino transferase (GPT) — was investigated in soil extracts from the wider rhizosphere during two vegetation periods. The enzymatic activities during the vegetation period are evidently more dependent on weather conditions than on special crops. In the middle of June in 1980, maximum activity in soil with oats and maize crops was correlated with increasing CO2 formation and increasing numbers of soil bacteria and soil fungi; minimum activity in July and another maximum in September was correlated only with the numbers of soil microorganisms. In consideration of the daily records of soil temperature within the 5-cm layer and precipitation, a dependence of the transaminase activity from the data of weather conditions, taken on three consecutive days before sampling, was evident.
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