Dünger-Rechner

Dünger-Rechner

Adjust cycle length (optional)

Default = the confirmed BUDXXL schedule: 2 weeks growth + 9 weeks bloom (bloom 9 is the flush week, water only). Nutrients scale to your chosen length.

Grow your own cuttings (pro)
Products in the kit

Each product adds 3% off the kit, up to 21%. All six base products make 18%; with Clone Gel from the cuttings option you reach 21%.

Our calculation basis & sources

We derive the need scientifically but deliberately output the verified BUDXXL manufacturer dosage as the quantity. Science explains the WHY; the amount comes from our feed schedule.

Light intensity ⟷ yield potential (W/m², PPFD, DLI): photosynthesis and biomass rise with light up to a saturation range. We use W/m² only to classify your setup, not to drive nutrient quantity.

  • Chandra, S. et al. (2008): Photosynthetic response of Cannabis sativa L. to variations in photosynthetic photon flux densities. Physiol. Mol. Biol. Plants 14:299–306.
  • Rodriguez-Morrison, V., Llewellyn, D., Zheng, Y. (2021): Cannabis Yield Increased Proportionally With Light Intensity. Front. Plant Sci. 12:646020.
  • Bugbee, B. (2016): Toward an optimal spectral quality for plant growth and development. Utah State University / Apogee Instruments (DLI-Grundlagen).

Nutrient demand by growth stage (N in growth, P/K in bloom): relative demand shifts across the cycle. This is exactly what the phase-based schedule reflects (Grow early, Bloom/Candy during bloom).

  • Saloner, A., Bernstein, N. (2021): Nitrogen supply affects cannabinoid and terpenoid profile in medical cannabis. Ind. Crops Prod. 167:113516.
  • Bevan, L. et al. (2021): Optimisation of Nitrogen, Phosphorus, and Potassium for Soilless Production of Cannabis sativa. Front. Plant Sci. 12:764103.
  • Cockson, P. et al. (2020): Impact of Phosphorus on Cannabis sativa Reproduction. Molecules 25(18):4165.

Watering volume by substrate (soil/coco/hydro/aero): drives total nutrient-solution throughput. A flowering canopy peaks at roughly 10 L/m²/day; our weekly curve builds up to that. For coco and aero we add 15 % drainage, for hydro 25 % (the weekly reservoir change comes on top) — that solution runs through fully fed.

  • Raviv, M., Lieth, J.H. (2008): Soilless Culture: Theory and Practice. Elsevier (Wasser-/Nährstoffhaushalt in Substraten).
  • Caplan, D., Dixon, M., Zheng, Y. (2017): Optimal Rate of Organic Fertilizer and Irrigation Frequency for Cannabis. HortScience 52(9):1307–1312.
  • phcppros: Cannabis Grow Facility Design 101, Part 2: Water Usage — ~1 L pro Quadratfuß blühender Fläche/Tag (≈10 L/qm) und 100–150 L Drainage je 1.000 Quadratfuß.
  • Botanicare: Feeding and watering frequency — Drain-to-waste setups and coir based media (10–20 % Runoff je Bewässerung); Coco for Cannabis: Watering Coco.
  • Alchimia: How to water cannabis plants in hydroponic systems (Reservoirwechsel etwa wöchentlich).

The concrete ml amounts do NOT come from a formula but from the verified BUDXXL feed schedule (ml per litre of water, weeks 1–11). The science explains WHY the schedule looks the way it does; the amount is our manufacturer recommendation.

  • BUDXXL feed schedule (weeks 1–11), identical to the PDF in the customer download area.

More background and all sources with links: the BUDXXL feed chart explained.