A reader asks:
I must admit to being a bit confused about your use of the term “NPK fertilizer” – I presume by that you are referring to artificially manufactured fertilizers? All fertilizers, including those we consider “natural” such as animal manure and compost, contain varying concentrations of Nitrogen (N), Phosphorus (P) and Potassium (K) (amongst other things), which is what makes the plants grow. So it seems to me that wanting to be “NPK free” is a bit odd? Julie
Thanks for your question, Julie. I’ll see if I can help answer your question.
Simply put we do not use any organic fertilizer product that has those three N-P-K numbers on the package.
To clarify, fertilizer by law carries a guaranteed ‘N-P-K Analysis’ — a promise that inside the bag you’ll get a certain percentage of Nitrogen (N), Phosphorous (P), and Potash (K). Your bag of fertilizer is supposed to replace used up N P K. Non-organic fertilizers have very high guaranteed NPK analysis while organic fetilizers have a lower guaranteed NPK analysis.
For example a list of “organic fertilizers”:
- fish emulsion
- bat guano
- seabird guano
- blood meal
- bone meal
- alflafa meal
- kelp meal
- feather meal
For example, somethings we do use:
- Worm Castings
- Animal Manure ( from our own backyard barnyard)
- Green Manures
You can see from some of the products that we do actually use, they aren’t classified as “fertilizer” since the nutrient content is NOT labeled on the package. We consider them soil amendments. This year we did splurge for the 10k Challenge and bought more than normal to give the soil (and me!) an extra boost.