Cultivation of vegetables in plastic tunnels is widespread in Poland. Plastic tunnels boost plant vegetation and provide protection against strong winds, rainfall and slight frost. A high number of vegetables may be cultivated in plastic tunnels from early spring to autumn. Species cultivated in early spring have high requirements, while obtaining early and excellent yield may sometimes be troublesome. Agrarius preparations are recommended for such an intensive cultivation. They ensure high nutritious value of vegetables, decrease the content of chemical substances and fertilizers residues, as well as the content of accumulated nitrates and phosphates by boosting a plant's metabolism. Bacterial preparations operate in soils by preventing fungal diseases. As a result, the yield will be abundant and of high quality.