The effect of sulfur on nitrate accumulation in lettuce (Lactuca sativa L.)

In this study, the effects of increasing amounts of sulfur applied to the lettuce plant under greenhouse conditions on the dry matter, sulfur, total nitrogen and nitrate content of the plant were investigated. For this purpose, urea fertilizer (100 mg N kg-1) and ammonium sulfate fertilizer (1, 5, 10, 20 and 40 mg S kg-1) were applied to the lettuce plant in a way that the nitrogen concentrations were balanced. The experiment was continued for eight weeks and at the end of the experiment, the plants were cut from the soil surface and the experiment was ended. As a result of the analysis, it was determined that the sulfur applied to the lettuce plant at an increasing dosses did not have any effect on the dry matter and total nitrogen content of the plant, but especially the 40 mg S kg-1 dose of sulfur caused a significant decrease in the NO3-N content of the lettuce plant.