Effects of microfertilizer application methods on potato productivity and nutritional quality in the Gegharkunik Region

Background: Optimizing mineral nutrition, particularly micronutrients, is essential for sustainable potato production and improving tuber nutritional quality. Micronutrients support key physiological processes, enhance stress resistance, and contribute to the accumulation of bioactive compounds. Identifying effective application methods alongside organic fertilization is critical for increasing yield, ensuring food safety, and promoting environmental sustainability—especially in ecologically sensitive regions like Armenia’s Lake Sevan Basin. Objective: This study aimed to improve potato yield and nutritional quality through the integrated application of Organomix organic fertilizer and targeted micronutrient supplementation. The research aligns with Armenia’s national strategies and global initiatives to promote sustainable, climate-resilient agriculture and improved public health. Materials and Methods: Field trials (2022–2024) were conducted in Vardenik, Gegharkunik region, using the Marfona potato variety. Five micronutrients—borax, copper sulfate, zinc sulfate, manganese sulfate, and ammonium molybdate—were applied in combination with Organomix (8 t/ha) using two methods: pre-sowing tuber soaking and foliar spraying at flowering. Soil and tuber parameters such as dry matter, vitamin C, and nitrate content were measured. Data were analyzed using one-way ANOVA and Least Significant Difference (LSD) test (p ≤ 0.05). Results: Micronutrient treatments significantly improved tuber yield and overall quality compared to Organomix alone, with ammonium molybdate, zinc sulfate, and copper sulfate showing the most notable effects. Increases in key nutritional parameters were positively correlated with yield gains. Although nitrate levels rose slightly, they remained within safe and acceptable limits. Conclusion: Supplementing Organomix with targeted micronutrients—especially through pre-sowing tuber soaking—effectively enhances potato yield and nutritional quality in the Lake Sevan Basin. This integrated fertilization strategy supports sustainable soil management, reduces dependency on synthetic fertilizers, and advances environmentally responsible agriculture. By improving the nutritional profile of potatoes, it also contributes to consumer health, food security, and regional economic sustainability. Keywords: Organomix, potatoes, microfertilizers, yield quantity, nutritional value, bioactive compounds, sustainable agriculture