| Abstract [eng] |
Various methods are applied in an international level in order to have a better control of nitrogen, phosphorus and other substances in the agroecosystems. Evaluation of the water that comes from soil drainage systems can show the direct effect of farming towards surface water. Object of the paper. Water from drainage system of agroecosystems. The aim of research. To determine the quality of water from drainage system of agroecosystems, to evaluate the load in biogenic substances and to give recommendation for pollution management. Tasks of the paper: 1. To determine the hydrochemical parameters of water from the drainage system of agroecosystems 2. To determine how dependant the chemical substances, washed from agroecosystems, are from natural and anthropogenic activities. 3. To give suggestions and recommendation for pollution management of agroecosystems. The research has been performed during March 2020 - February 2021 period by evaluating the meteorological conditions, measuring the water debit, taking the water samples once a month from four different research places. The concentrations of common phosphorus and surface anionic substances in the water has been determined using spectrophotometry method. Liquid chromatography method has been used to evaluate the amount of inorganic compounds (NO3-, Cl- and SO42-). According to the research, the biggest momentary water debit was in March 2020 and January 2021, however, the changes in water debit had no major impact towards the washed compounds during the research period. The load on water by nitrate nitrogen in drainage systems depends on the type of soil and how intensive the farming is, it does not depend on the size of drainage systems: the nitrates have all the limit values (23 mg/l), allowed during the research period, in a water that comes from sandy soil (from 32,9±8,03 mg/l to 76,72±0,83 mg/l). A significant correlation of nitrates and sulphates (R2=0,44, p<0,01) has showed, that the sulphate load on water that comes from drainage systems is also related to the type of soil and intensity of farming. The concentration of common phosphorus in water from drainage systems was below the method detection line during the research period and it shows, that phosphorus is collected in the soil and has no relation to pollution of surface water. It is recommended to control the amount of fertilized used by taking into account the type of soil and to modernize draught systems by making a barrier between releasers of drainage system and surface water. |
