Research carried out on the nitrite and nitrate contents are directly influenced by the level of fertilisation. Applying very high rates of fertilisers on vegetable crops has a negative impact on produce quality, despite the high level of the yield. Analysing yield in the field depending on the level of fertilisation confirms the fact that between the level of fertilisation and the yield there is a positive correlation. In garden beet, yield oscillated between 8,050 kg/ha and 27,325 kg/ha. In cucumbers, absolute yield oscillated between 29,353 kg/ha and 140,260 kg/ha. Celery yield oscillated between 7,840 kg/ha and 25,460 kg/ha. Radish yield had lower values between 4,280 kg/ha and 15,845 kg/ha. Yield in spring onion was lower, ie it reached about 16,000 kg/ha in the variant fertilised with N60P45K45.