E7 NITROGEN CONCENTRATION (6) NH4-N [mg l-1] Station I1, 1972-1973 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec --------------------------------------------------------------------------------------------------------- .000 .000 - .004 .080 .002 .020 .020 .030 .030 .010 .240 Station I2, 1972-1973 .010 .000 - .000 .030 .000 .016 .030 .020 .000 .020 .030 Station II2, 1972-1973 - .020 - .000 .000 .003 .020 .020 .000 .020 .020 .020 Station III2, 1972-1973 .000 .000 - .000 .000 .000 .050 .050 .020 .050 .010 .010 Poseljani, 1972-1973 .004 .004 - - - .000 .020 .020 .030 .030 .080 .080 NO3-N [mg l-1]* Station I1, 1972-1973 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec --------------------------------------------------------------------------------------------------------- .113 .068 .034 .041 .057 - .045 .003 .079 .057 .158 .102 Station I2, 1972-1973 .102 - - .170 .188 - .034 .004 .068 .045 .136 .079 Station II2, 1972-1973 .041 - - .170 - - .027 .005 .181 .079 .136 .072 Station III2, 1972-1973 - .057 .090 - .045 - .027 .003 .192 .045 .102 - Poseljani, 1972-1973 .045 .045 .045 - .000 - .027 .003 - .045 - .057 * Converted from the original determination of NO3.