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Abstract

The risk of diffuse pollution of groundwater by nitrogen substances from agricultural land is perceived as a result of the interaction of groundwater vulnerability (determined by the characteristics of the environment overlying groundwater in relation to water transport or soil solution) and loading of overlying environment by nitrogen. Index of groundwater vulnerability was assessed on the basis of four parameters, namely, the amount of effective rainfall in the period from October to March, the capacity of soil to accumulate water, the average depth of the groundwater table and the permeability of the rock environment. Assessment of the index of loading of overlying environment by nitrogen was based on two parameters, namely, nitrogen balance and crop cover on agricultural land in the winter half on districts level in 2012, which corresponds with current state of the load. The resulting risk of groundwater pollution by nitrogen was expressed by the formula counting with the transformed values of groundwater vulnerability index and the index of loading of overlying environment by nitrogen. From practical point of view, the above mentioned indexes, as well as the subsequent risk of diffuse groundwater pollution, were spatially expressed via three associated categories. Based on the evaluation of relevant parameters, 5.18% of agricultural land falls into the category of very high and high risk, 42.20% in the medium risk category and 52.62% in the category of low and very low risk of diffuse pollution of groundwater by nitrogen from agricultural land.

,454,612.0 936.00 1,505,088.0 Sum - 9355.5 15,882,079.9 6591 13,098,766.85 2764.5 2,783,313.05 * Mean for 2017 and 2018. Owing to the donation of unsold food for charity purposes, the food waste decreased by almost 30%. WF of the transmitted food was estimated to be 2.8 million m 3 . The mentioned measures allowed decreasing the unjustified environment loading by ca. 17.5% in the examined range of water consumption. Similar to CO 2 emission, the reduction of water print was dependent on the type of the redistributed food and varied from 1.1% for fresh meat and fish to 38% for