| Abstract: | Microsymptoms in maize and tomatoes resulting from imbalanced nitrogen and phosphorus supply The inducing factors of visible symptoms are not easy to identify in cases of ?complex”? symptoms. ?Complex”? symptoms originate from simultaneous multiple nutrient deficiencies, nutrient deficiency and excess, or multiple nutrient toxicities. Microsymptoms are well known for nitrogen and phosphorus deficiency supply as well as for nitrogen excess supply. The aim of the present paper was to study whether these microsymptoms can be helpful in diagnosing visible symptoms which are difficult to identify in cases of ?complex”? symptoms. The experiments were carried out with maize and tomatoes under controlled experimental conditions in solution culture. Microsymptoms which occur in response to nitrogen or phosphorus stress – deficiency or excess – occur in the same way in plants that are suffering from imbalanced nitrogen and phosphorus supply. In cases of multiple toxicities further microsymptoms occurred. These symptoms mainly depended on the nutrient concentration in the solution. |
