- You cannot place a new order from your country (United States).
search
BAC Organic PK Booster 500 ml
BAC Organic PK Booster 500 ml is BAC's certified organic phosphorus and potassium booster, specifically developed as a complement to organic bloom nutrition. With an NPK profile of 4-2-8, this concentrated formula delivers substantial potassium and phosphorus from entirely biological sources, supplemented with calcium, iron, and five additional trace elements. Drives explosive sugar production for heavier flowers with enhanced flavour and aroma. Dosing at 10–40 ml per 10 litres, progressive throughout bloom. No pH or EC measurement required. Vegan certified. The organic alternative to mineral PK boosters for certified biological cultivation.
BAC Organic PK Booster 500 ml – biological phosphorus and potassium supplementation for bloom
As flowering plants mature, their demand for phosphorus and potassium escalates significantly. BAC Organic PK Booster meets this demand through entirely biological means with a concentrated NPK 4-2-8 formula that has already demonstrated outstanding results in British agriculture and horticulture. As the PK supplement within the BAC organic programme, it works in concert with BAC Bloom Organic to maximise flower production without compromising organic certification.
Inside the NPK 4-2-8 organic PK formula
The Organic PK Booster is fundamentally different from mineral PK boosters in its biological origin and mode of action. The potassium content of 7.8% K2O forms the core of the formula, driving sugar production, cell expansion, and water regulation within the plant. The phosphorus content of 1.8% P2O5 supports the energy transfers required for flower formation and fruit maturation. All ingredients are processed by soil micro-organisms before becoming plant-available.
- NPK 4-2-8: potassium-dominant profile that maximises in-plant sugar production during the critical bloom phase.
- Trace elements: calcium, copper, iron, manganese, sulphur, and zinc for comprehensive micronutrient coverage.
- Biological ingredients: all raw materials sourced from plant or animal origin, approved for certified organic cultivation.
- No EC measurement required: soil biology naturally regulates nutrient bioavailability, simplifying application.
Progressive dosing from week 2 of bloom
Introduce the Organic PK Booster from the second week of flowering. Apply 10 to 40 ml per 10 litres of water, increasing progressively as bloom advances and phosphorus-potassium demand intensifies. Administer with every watering alongside your BAC Bloom Organic base nutrition. As plants mature and flowers fill, step up the concentration incrementally following the BAC feeding schedule. For enhanced flower initiation and optimal microbial activity, combine with the BAC Bloom Stimulator which multiplies beneficial soil organisms.
Organic PK vs mineral PK: choosing the right booster
BAC offers two PK booster pathways: the mineral F1 Extreme Booster (NPK 0-13-14) and this biological Organic PK Booster (NPK 4-2-8). The distinction is fundamental and goes beyond ingredient sourcing. The F1 Extreme delivers phosphorus and potassium in immediately plant-available mineral form for rapid uptake. The Organic PK Booster operates through soil biology: organic ingredients are converted by micro-organisms, providing a more gradual and natural nutritional process that builds soil health simultaneously. For growers maintaining full organic certification under Soil Association and Ecocert standards, the Organic PK Booster is the only compliant choice. The 500 ml format offers an accessible entry point for organic growers. Complete your bloom programme with BAC Final Solution in the final week for a clean substrate flush.
Order BAC Organic PK Booster 500 ml from our Belgian growshop for fast delivery across Belgium. The certified organic PK booster for growers who demand quality without compromising biological standards.
When should I start using BAC Organic PK Booster?
Introduce from the second week of flowering and continue until the final flush week. Start at 10 ml per 10 litres of water and increase progressively toward 40 ml as bloom advances. Follow the BAC feeding schedule for precise weekly dosing guidance.
What is the difference between the Organic PK Booster and F1 Extreme Booster?
The F1 Extreme (NPK 0-13-14) is a mineral booster with immediately plant-available phosphorus and potassium. The Organic PK Booster (NPK 4-2-8) uses biological ingredients converted by soil micro-organisms. Choose the organic variant to maintain Soil Association and Ecocert certification compliance.
Do I need to measure EC when using the Organic PK Booster?
EC measurement is not required with BAC organic products. Soil biology naturally regulates the rate at which nutrients become plant-available. Follow the BAC feeding schedule dosages and monitor your plants visually to fine-tune application rates.
Can I use the Organic PK Booster with non-BAC organic bloom nutrition?
The Organic PK Booster is primarily developed as a complement to BAC Bloom Organic but is compatible with other biological bloom nutrients. It adds natural phosphorus and potassium supplementation regardless of the base nutrition brand. Always verify compatibility with your specific certification requirements.
