Fish emulsion is a quick-acting organic liquid fertilizer made from byproducts of the fish oil and fish meal industry. It is also called fish fertilizer. It is a thick concentrate that you dilute with water and apply to your lawn or garden. It can have a strong fishy odor, but deodorized fish emulsion is commonly available as well.
Fish emulsion is appropriate for many uses in the garden but is especially useful as a lawn fertilizer in early spring and to feed leafy green vegetables due to its higher nitrogen content. Be careful when applying too much of it, though. If your soil already contains too much nitrogen, applying too much fish emulsion can cause nitrogen "burn" and affect growth. If you are not sure what condition your soil is in, use a home soil test to find out or hire a professional to examine the soil.
To use fish emulsion, you first need to dilute it. Add just 1/2 ounce of fish emulsion to 1 gallon of water. Then water the plants using that fish water. Because fish emulsion works quickly, you may want to apply it more frequently. In fact, North Carolina State University researchers report that applying it twice a week gives plants the most significant growth compared to other frequencies. You can continue to apply it if the frequency seems to be working. You may consider fertilizing your lawn every spring with fish emulsion using a hose-end sprayer.
Make Your Own
You don't have to buy fish emulsion as you can make your own fish emulsion if you have fish scraps available. All you need is a bucket with a lid, dried leaves or other brown material, fish scraps, and water. Here is how to make it:
- Designate a five-quart bucket for the emulsion. It will always smell like fish after this, so you likely won't want to reuse it for something else.
- Get fish scraps from a store, or put your own in.
- Layer them in with leaves until the bucket is two-thirds full.
- Top the layers with a fish layer.
- Cover the mixture with water, leaving a few inches of space on top of the bucket.
- Seal the bucket and tuck it away. Check it each day for a week, and then every few days, to see if the gas is building up. When you notice gasses begin to form, you should stir the mixture once a week.
- It should sit for about a month. If you live in a warmer climate, it may tend to break down faster.
- To use the homemade fish emulsion, strain out leaves and fish bits being careful not to allow it on your skin or clothing. Dilute about 5 ounces of the emulsion into 1 gallon of water, or dilute 30 ounces of it into a 5-gallon bucket. Apply to the garden.
- Don't get rid of the leftover scraps. Add more water to the bucket and start the process again. You can typically use used material about three times.