The Role of Garlic and Onion Extracts in Growth and Productivity of Onion under Soil Application of Potassium Humate and Fulvate

Allium crops and their relatives are recognized as a distinct family, the Alliaceae. Onion (Allium cepa L.) belongs to this family, which considered the most important crop grown in Egypt. The area harvested was about 63,723 (ha), while the national production was about 2304210 tons (FAO, 2018). The onion bulb contains vitamin C, protein, flavonoid and quercetin, which helps to eliminate free radicals in the human body, to inhibit low-density lipoprotein oxidation (an important reaction in atherosclerosis and coronary heart disease), to protect and regenerate vitamin E and to inactivate the harmful effects of chelate metal ions. Also, onion is a rich source of minerals like P and Ca (Fouda, 2016).