As part of WP T2, D2.2, plant pot trials were conducted under controlled conditions to determine fertilizer performance at a level of plant availability, and to determine the nutrient use efficiency of the recycling-derived fertilizers. Trials were done by pot cultivation of Spinacea olaracea (spinach). The experimental set-up consisted of seven treatments comprising of:
- Blank (no fertilization)
- Control (synthetic NPK)
- Ammonium nitrate + synthetic PK
- Ammonia water + synthetic PK
- Concentrate after evaporation + synthetic N
- Ammonium nitrate + concentrate after evaporation (blend 1)
- Ammonia water + concentrate after evaporation (blend 2)
Except blank, all other treatments were done in two dosages:
- N fertilizer advice
- N fertilizer advice – 50%
