Keywords: perennial grasses, seed crops, potato, variants of mineral fertilizers, nitrates, nitrites, hydro thermal coefficient, weather conditions, soil types

// Мелиорация. – 2016. – №3(77).– С. 41—48

The article itemizes various factors which affect nitrate level in plants according to research data and systemized information from literature. It is found that accumulation of these compounds in plants significantly increases due to the nutrition imbalance. We get the lowest nitrate level if perennial grasses are fertilized with nitrate top-dressing of delayed action. Potassium nitrate increases nitrate level in plants. Weather conditions influences nitrate content. Daily nitrate dynamics was fixed: the lowest nitrate level was during evening grass harvest.