How do you make homemade Fish/Seaweed Emulsion?

captaincompostal(z7 AL Bham)January 1, 2013


As you may know fish emulsion, fish meal, seaweed/kelp meal, and liquid seaweed/kelp are some of the most powerful natural fertilizers and soil amendments in the world.

NOTE: For those organic gardeners who prefer vegetarian soil amendments, you can skip the fishy ingredients, it's not necessary. There is plenty of NPK in alfalfa meal and other grains that you can use.

Most commercial fish emulsions are rated NPK = 5-1-1.

Most commercial liquid seaweed sprays are rated NPK = 0-0-1.

Even though these NPK ratings to a novice may seem low, there are lots of important trace elements, growth hormones, disease control, and organic matter in these products.

Fish Emulsion is mainly used for its quick high organic nitrogen and available soluble P and K benefits as a foliar feed. Fish Meal is mainly a great soil conditioner and great bacterial food to help feed the soil microherd. Even though there may be 4-5% organic N, 1% soluble P, and 1% soluble K in fish emulsion, there may be up to 6-8% total N, and 2-3% total insoluble P or K in it, that gets broken down later by the soil microherd. Most commercial fish products are made from the trash products of the menhaden fish. This fish is a relative of the herring, sardine, and anchovy fishes. Most commercial fish emulsions contain up to 5% sulfuric acid in order to preserve the fertilizer on the shelf, but also it supplies needed sulfur to the plant and soil. Most economical fish products do not contain any fish oils in it, which supply extra beneficial soil fungi. Most also do not contain much fish bones which supply extra calcium.

Seaweed/Kelp has a low NPK = 0-0-1. However, just like the fish products and all other natural fertilizers, there are more insoluble NPK nutrients and other trace elements in the product than meets the eyes. There may be up to 1-3% total N, 1-2% total insoluble P, 3-5% total insoluble K in seaweed products. The real benefit of seaweed is not in its NPK amounts. Seaweed/kelp can contain 60 trace elements, many growth hormones, and disease control properties in it! Basically every nutrient that any surface plant can ever need! If seaweed products are mixed with high N products like fish, you have an excellent complete natural fertilizer and soil amendment that will supply every NPK and trace element need of the soil and plant. Seaweed and other algae plants are some of the most powerful plants on earth, or should I say in the ocean. Seaweed is also an excellent food source for beneficial fungi in the soil.


A. It's cheaper to make most natural fertilizers and soil amendments in large quantities.

B. There are some nutrients that you get from homemade versions that are not in most commercial brands. For example, commercial fish emulsion since it is processed from trash fish, will have less fish oil, fish bones, and proteins than fresh fish parts or...

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