In onion crops apart from nitrogen, phosphorus and potash, micronutrients are also essential, and their deficiency results in production and productivity. For example, pungency in onions is due to an element called allyl propyl disulphide. In order to increase this pungency and increase production, sulfur is required in onions.

Sulphur: All leaves young and old appear uniformly yellow, Also, in plants deficient in sulphur, the leaves lose their green color.

Manganese: The veins of the leaves turn yellow and start burning, the color of the leaves fades and they start turning upwards. Crop growth is stunted, onion bulb formation is delayed and the upper part (neck) of the bulb becomes thick.

Copper: Proper amount of copper is necessary for the development of the upper cover of bulb in onion crop. Copper deficiency causes young leaves to turn white at the tip and curl into a spiral, or curl to the right side of the plant, as well as softening of the tuber sheath, becoming pale yellow and thin.

Calcium: Calcium is an important nutrient for crop growth and storage quality. Due to its deficiency, the new leaves start drying suddenly without turning yellow, as well as the leaves become very narrow.

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