UKROPNING O‘SUV DAVRLARIDA TUPROQDAGI AMMONIYLI AZOT DINAMIKASI

In this article, the effect of mineral, organic, and organo-mineral fertilizers applied to tomato as a repeated vegetable crop on the dynamics of ammonium nitrogen (NH₄+) in the soil during the growing stages of the subsequent intercrop – dill – was studied. During the research, changes in ammonium nitrogen in the soil layers were observed at the main phenological stages of dill – germination, 2–3 true leaf stage, and rosette formation. According to the results, the residual effect of additional nutrients applied to tomato maintained relatively high concentrations of NH₄+ in the soil during the early growth stages of dill, which accelerated the initial development of the plants. At later stages, a decrease in ammonium nitrogen content was observed, which was associated with its active uptake by the plants and nitrification processes. The experimental results showed that the preceding crop and fertilization system play an important role in managing the dynamics of nitrogen forms in the soil for dill cultivation. This information provides an opportunity to scientifically improve the nutritional regime when growing dill as an intercrop.