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This study evaluates the impact of NPK fertilization on soil chemical properties, nutrient dynamics, and sunflower (Helianthus annuus L.) yield under field conditions in Western Romania. The experiment was conducted on a chernozem soil, where different fertilization rates were applied to assess their influence on key soil parameters, including pH, total nitrogen, available phosphorus, exchangeable potassium, and selected microelements. Soil samples were collected at different growth stages of sunflower and analyze...