Abstract
<jats:p>Vegetables are essential foods, directly related to human health, productivity, and lifespan. Studying the biochemical composition of vegetable products, which depends on numerous factors, including fertilization, is a key component of food security. Therefore, we studied changes in the biochemical composition of vegetable crops from the influence of the introduction of organic (manure) and mineral complex fertilizers in the conditions of Azerbaijan. Organic and complex mineral fertilizers were found to increase yield and product quality. High doses of nitrophoska and nitroammophoska increased dry matter (up to 6%), sugar (up to 11%), and vitamin C (up to 12%) in garlic compared to the control, and increased cauliflower content by 5%, 11%, and 13%, respectively. Adding manure significantly altered sugar accumulation in onions, while garlic showed a tendency to increase it. The studied fertilizers had a significant impact on vitamin C accumulation in garlic and cauliflower. In cabbage heads, dry matter increased in the variants of manure with nitroammophoska mineral fertilizer by 5-8%. In all studied treatments, nitrate levels in vegetables remained within acceptable limits. However, with high fertilizer doses, they were relatively high compared to the control (without fertilizer): 1.6-2 times in cabbage, 1.2-1.6 times in garlic, and an indeterminate change in onions.</jats:p>