Two field experiments were carried out at the Experimental Station Farm, Faculty of Agriculture, Mansoura University, Egypt, during the two successive seasons of 2016/2017 and 2017/2018, to study the impact of magnetized irrigation water, compost addition, different levels of nitrogen and potassium fertilizer moreover their interactions on yield and its components, chemical composition and storability of garlic (Allium sativum L.) cv. Sids-40. Data showed that irrigation with magnetized water gave the highest significant values of yield and its components, quality characteristics except nitrate (NO₃) and nitrite (NO₂) contents in head of garlic after harvest and storage traits in the two growing seasons compared to ordinary water treatments. Also, data show that compost addition increased significantly all studied characters. Moreover, fertilized garlic plants with 100% NK followed by 75% from recommended doses produced the highest values of all parameters. It could be recommended that irrigation garlic plants with magnetized water, 75% NK from the recommended dose and compost addition at 10 m³/fed for maximizing productivity, quality parameters, storage and minimizing the environmental pollution comparing to plants irrigated with ordinary water + 100% NK.