The effect of chemical, slow release and organic nitrogen fertilizers on plant development, nitrate concentration and nutritional elements in spinnac in greenhouse conditions

The study was carried out with the aim of creating a cage on the spinach plant and NO3- animal with the chemical, slow spreading and organic nitrogen sourced fertilizer in the greenhouse environment. The study was carried out under greenhouse conditions under five different doses of N (25, 50, 100, 200 and 400 mg kg-1 N) and four different N fertilizer applications (ammonium sulfate, slow release fertilizer, walking nitrate and yeast waste). The effect of N applications on dry matter source, NO3- animals, total N animals, plant owners and plant nutrition intake were targeted. According to the results obtained from the study, it was determined that as the N dose increased, the most significant difference in the dry matter yield of the plant was CN (5.67 g plant-1), with an increase of 27.1%. It was observed that the NO3- concentration of the spinach plant increased significantly between 369 mg kg-1 and 4394.7 mg kg-1 with increasing doses of N application. When increasing doses of N application are associated with the limit values of the spinach plant; It was determined that K, Zn, Mn elements were found in sufficient levels, and Ca, Cu, Fe, B elements caused toxicity. Key words: nitrogen, NO3- concentration, spinach, slow release fertilizer, storage