Abstract
The consistent patterns of chemical composition of wet deposits and drainage runoff concentration have been permanently studied in two stationary sites in the Middle Lithuania for the last decades since late 1980s. The results of simultaneous observations presented in this paper show that the concentration of SO4 -2–S, Mg+2, PO4 -3-P, NO3 --N, NH4 +-N and Ca+2 in wet deposits positively correlates with the concentration of these ions in drainage runoff water (R=0.59, 0.61, 0.51, 0.49, 0.42 and 0.35, correspondingly, R05=0.35). A sharp decrease in SO4 -2–S concentration from 5.5 to 2.5 mg l-1 and periodical decrease versus increase in NO3 --N and NH4 +- N concentration and load are determined in the agroecosystems studied from 1988–1989 with short intervals to 2007. This outcome has mainly an economic character: impact of changes in animal numbers, increase of transport load, fuel consumption and industrial emissions.
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