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Abstract
The aim of the research was to determine the effect of fertilisation applying various doses of manure and nitrogen on the selenium content of soil against a background of soil catalase and dehydrogenase activity. The experiment was conducted using a crop rotation system of: potato–winter wheat+intercrop –spring barley+undersown and red clover+grasses. The soil was treated with organic fertilisation in the form of manure under potato at doses of 0, 20, 40, 60 and 80 t·ha −1, and with nitrogen at doses of 0, 40, 80 and 120 kg N·ha −1. A supplement of manure at 80 t·ha −1 resulted in the greatest significant increase in soil total selenium content of ∼100% compared with soil from control plots. We observed that interaction of the highest manure and nitrogen doses resulted in a significant decrease in the total selenium content of the soil. Selenium content in soil was statistically highly correlated with organic carbon content. Analysis of the correlation showed a significant dependence between the total selenium content in the soil and the activity of soil catalase and dehydrogenase.