engleski

Leaching nitrate and atrazine on the reclamation test field of different drainpipe spacing

The research was conduced on the Jelenščak reclamation test field in Croatia, on hydroameliorated Gleyic Podzoluvisol during five years. The basic aim of this research is to determine leaching of nitrate and atrazine in drainage water in four different drainpipe specing (15 m, 20 m, 25 m and 30 m). Maize was grown as the trial crop and the same agricultural practices were applied in all drainpipe specings in all trial years. Drainage discharge was measured continually by means of automatic elektronic ganges – limnimeters, which were set up in each variant, at the drainpipe autlet into the open canal. Drainage water was sampled every day during the discharg period. Nitrates were determined by the yellow colouring of phenol disulphonic acid: Atrazine extracted from the samples of drainage waters was determinated by gas chromatography. Data were statistically processed by means of analysis of variance. The guantity of nitrogen leached was different from year to year and carresponded to total nitrogen added with fertilization and amount of annual precipitation. The concentrations of the atrazine recorded in drainage waters varied in a wide range, with maximum values recorded soon after its application and at the start of higher drainage discharge. The results indicate that concentrations of nitrate and atrazine drainage waters exceeded the allowable values in the larger part of the year in all drainpipe spacing. There were no statistically significant differences between the tested drainage systems in drainage water contamination with nitrate and atrazine.

Drainage water; Maize; Leaching; Nitrate; Atrazine

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