G. Hristova
Department of Agricultural Engineering, Faculty of Agriculture, Trakia University – Stara Zagora, Bulgaria
(Manuscript received 02 July 2025; accepted for publication 29 Octomber 2025)
Abstract. This study presents a two-year comparative agrochemical analysis of soil samples collected from an agricultural field in the Zetyovo area (Southeastern Bulgaria) during the 2022 and 2023 growing seasons. The objective is to monitor the dynamics of key macro- and micronutrients in the soil and evaluate the effectiveness of fertilization and agronomic practices for five major crops: wheat, barley, maize, sunflower, and rapeseed. Results showed a decline in nitrate and ammonium nitrogen, as well as molybdenum and magnesium levels, indicating nutrient depletion and the need for corrective fertilization strategies. Soil pH remained within optimal ranges, reflecting good buffering capacity. Phosphorus was identified as a limiting factor for yield in most crops. Based on the findings, crop-specific fertilizer recommendations were proposed, including appropriate rates and adjustments for micronutrient deficiencies. The study emphasizes the importance of targeted agrochemical monitoring and adaptive nutrient management tailored to crop-specific needs and the spatial and temporal variability of soil resources.