This project was launched in response to the upcoming ban on popular plant‑based commercial fertilizers such as OPF (11‑0‑5). These and related fertilizers are likely to be prohibited in organic production because of their high share of ammoniacal nitrogen, which is immediately available to plants and therefore not in line with the principles of organic fertilization. Traditional alternatives mainly consist of raw materials originating from the conventional meat industry, making them less desirable as well.

Through on‑farm trials, the value of several (plant‑based) alternatives was evaluated. The trials show that all alternatives perform less well than OPF or similar products. Fertilizers based on animal by‑products release nitrogen more quickly and are therefore better suited for short crops such as early spring spinach. Plant‑based fertilizers work more slowly but are useful in longer‑cycle crops such as industrial cauliflower.

In addition, the project compiled an extensive list of available commercial fertilizers, which will be published as an online brochure together with general background information (new version of the 'Guide to Organic Commercial Fertilizers' from 2010). This list will also be updated after the project ends whenever major changes occur on the market.