DIY fish emulsion is produced through an aerobic fermentation, which is why you have to leave your fish gut mixture exposed to the air and stir it regularly - just like regular compost. But the fermentation process is slightly different.Ĭommercial fish emulsions are heated and the oils are skimmed off to sell as separate ingredients, making the remaining fertilizer poorer. Both types use enzymes to digest and liquify the fish, breaking it down into chemical elements the plants - or the communities of microbes and fungi in the soil which help the plant - can absorb. There are two types of fish fertilizer: emulsion and hydrolysate. Fish fertilizer has a high proportion of nitrogen, which encourages shoot and leaf growth, but it is low in potassium, which is why I added banana peals to my recipe. Have you noticed the three numbers on bags of fertilizer? They stand for nitrogen (N), phosphate (P) and potash (potassium - K). This instructable also includes directions for making sauerkraut from scratch because one ingredient for the fish fertilizer is the live lacto bacilli cultures you will find in sauerkraut - but if you want to skip this step and the 3-4 weeks needed, you can buy some ready-made (as long as it is unpasteurized. In fact, you could probably use it as seasoning. when it's done (if it's done right) your fertilizer should smell no better or worse than edible fish sauce. You can make your fish fertilizer the easy, anaerobic way. You will not need to stir every day, for weeks on end, a putrefying mess of fish guts while fighting off flies and maggots. There are some really scary DIY fish fertilizer recipes out there - this is not one of them.
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