The most significant and irreversible is the overexploitation of the environment, which is constantly exposed to various forms of pollution. Soil pollution is the result of excessive use of fertilizer in a limited area for growing. Total of 30 technologies were analysed, specifying the pollution degree from fertilizers and natural manure. Technologies concerned three crops: corn for silage, sugar beet and meadow grasses. Informations were derived by surveys. During the analysis, it has been noted that some cultivation technologies exceeded the permissible level (170 kg N·ha-1) of nitrogen fertilization. In analysis were noted the nitrogen excess delivered to the fields every year. Probably that was connected with the overproduction in surveyed farms. Overproduction (according to permissible level of nitrogen) averagely reached 98.29 kg·ha-1 of delivered nitrogen, giving 6 290 560 m3 of biogas.
Key words: NPK fertilization, environmental protection, soil fertilization, technologies of agricultural production.
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