Our Ammonium Sulfate fertilizer is the perfect blend for growing onions, garlic, elephant garlic, shallot and leeks. These crops are heavy-feeders, meaning they require significant amounts of nutrients (nitrogen and sulfur) and water throughout their initial growth phase.
Allium species (onions, garlic, elephant garlic, shallots and leeks) generally have two growing phases throughout the life of the plant. The first phase is called the “vegetative phase.” During the vegetative phase, plants are focused on maximizing foliage or green growth. This foliage will then be used to synthesize sugars and form the bulb that will be harvested in the second stage. As such, the second stage is appropriately named the “bulbing phase.”
The more foliage that is generated during the vegetative stage, the larger the bulb that will be produced during the bulbing stage. In onions and shallots, each leaf represents a ring on the eventual bulb. Therefore it is important to provide the nitrogen and sulfur needed to get as much leaf growth as possible during the vegetative stage. This will result in large bulbs and bountiful harvests.
Ammonium Sulfate provides a fast-acting source of nitrogen and sulfur. It can be applied in granular form via side-dressing, or as a liquid formulation through injection. Side-dressing should be followed by a light cultivation so that the fertilizer is incorporated into the top couple inches of soil. Sprinkle the fertilizer to the side of the plants without getting it on the plant leaves. Because it is water-soluble, it can also be administered via injection through our EZ-FLO Fertilizer Injector. Easily dissolve the appropriate amount into the EZ-FLO injector and inject it through the drip irrigation system for quick and effective results.
Ammonium Sulfate Use Recommendations
Begin applications three weeks after transplanting. Repeat every 3-4 weeks. Side-dress 1 cup per 20 linear feet of row. When side-dressing, always water immediately after feeding.
If injecting through a drip irrigation system, half the rate and dissolve 1 cup per 40 linear feet of row.
- Total Nitrogen (N) – 21.0%
- Ammoniacal Nitrogen – 21.0%
- Sulfur (S) – 24.0%