Choose the Best Fertilizer for Onions
When selecting a fertilizer for onions, there are several factors to consider. First, it’s important to look at the nitrogen (N), phosphorus (P) and potassium (K) content of the product. These nutrients play an important role in onion growth, so you will want to make sure that your chosen fertilizer has sufficient levels of each one. Using 10-10-10 fertilizer or 15-15-15 fertilizer is a good option, as they are high in these nutrients, and they are well-balanced.
Another thing you should consider is the form of the fertilizer. Onion plants are shallow-rooted, so it’s important that you choose a type of fertilizer that will not harm their roots. A granular fertilizer is ideal for this purpose, as it can be applied without fear of root damage. If you plan to use liquid fertilizers or foliar sprays, you should look for products that are specifically designed for use with shallow-rooted bulbs.
Organic Onion Fertilizers
Many gardeners prefer to use organic fertilizer for onions. These products are safe and effective, as they provide nutrients in a gradual, steady manner. There are several different types of organic fertilizer that can be used to promote onion growth.
- Manure: Manure-based organic fertilizers work well with onions, as they contain high levels of nitrogen. For best results, use a well-rotted manure product.
- Bone Meal: This is a slow-release phosphorus source that can be added to the soil before planting your onions. It’s important to note that it also contains small amounts of nitrogen and potassium, so you will still need to supplement with other types of fertilizer if necessary.
- Compost: Compost tea is a popular organic fertilizer for onions, as it can be used both during and after the growing season. To use compost tea, simply dilute some compost in water, then apply to your onion plants with a spray bottle. The resulting mixture should look like weak chai tea.
How to Fertilize Onions?
Now that you know how to choose the best onion fertilizer, it’s time to learn how to use it properly. As we already mentioned, onion plants are shallow-rooted and don’t require a lot of nitrogen in order to thrive. In fact, too much nitrogen can cause them to produce too many leaves and fewer onions.
That’s why it’s important to apply fertilizer in a targeted fashion. You should work the fertilizer into the very top layer of soil around, then water thoroughly. Apply fertilizer every 2 or 3 weeks from planting onions until harvest. If you’re using granular fertilizers, be sure to scratch them into the ground with a rake, so that they don’t simply sit on the surface.
Now you know how to choose the best fertilizer for onions. If you are interested in growing onions, read the rest of our articles!