Fish emulsion, or fish fertilizer for plants, is a fast-acting, organic liquid fertilizer made from the byproducts of the fishing industry. It is rich in nitrogen, phosphorus, and potassium, plus trace elements such as calcium, magnesium, sulfur, chlorine, and sodium. Not only is fish fertilizer an organic option, it is made from fish parts that would otherwise be wasted. Selecting fish fertilizer is a terrific option for leafy green veggies due to its high nitrogen content, and also is beneficial as a lawn fertilizer in the early spring. Do be careful when applying fish fertilizer, however. Too much fish emulsion can burn plants and affect their growth.

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Source: Gardening Know How