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Hesi Pro-Line PK 1l
Hesi Pro-Line PK 13/14 is a PK fertiliser engineered for progressive phosphorus and potassium supplementation during the second half of flowering in hydroponic and coco systems. Phosphorus supplies the structural backbone for DNA strands and ATP energy molecules essential for flower formation. Potassium regulates water transport, CO2 uptake and photosynthetic capacity. Gradual dosage increase prevents excessive PK concentration in early bloom, critical in unbuffered growing media. Apply alongside your base flowering fertiliser. Dosage: 2.5-15 ml per 10 litres, progressively increasing. Discontinue one week before harvest. For soil cultivation, use Hesi Phosphorus Plus instead. Order at plantandflower.be for fast Belgian delivery.
Hesi Pro-Line PK 1l – Progressive PK Supplementation for Hydro and Coco Flowering
Phosphorus and potassium demand escalates throughout the flowering phase, but timing the increase matters more than the absolute quantity. In unbuffered growing media like hydroponics and coco, every change in the nutrient solution reaches the root zone immediately – making gradual PK supplementation essential rather than optional. Hesi Pro-Line PK 13/14 is designed as a precision dosing tool that allows growers to incrementally raise PK levels from mid-bloom, avoiding the ion imbalances that premature supplementation creates.
Phosphorus, potassium and the metabolic demand of flowering
Flowering is fundamentally a reproductive process. The plant constructs massive quantities of genetic material – every DNA strand contains a phosphate backbone and the ATP energy carriers that drive flower formation are phosphorus-rich molecules. Simultaneously, potassium operates as the plant's internal transport system: regulating water movement from roots to leaves, controlling stomatal CO2 uptake and directly influencing photosynthetic capacity.
- Progressive dosing protocol: start at 2.5 ml/10L at mid-bloom and gradually increase to 15 ml/10L in the final weeks – this ramp-up prevents salt shock in unbuffered media where root exposure is immediate.
- Potassium balance is critical: excess potassium induces calcium and magnesium deficiency. Since magnesium is the central atom of chlorophyll, an imbalance would impair the very photosynthesis that potassium is meant to enhance.
- PK 9-7 classification: calibrated nutrient ratios that deliver effective PK supplementation without overloading the solution with unnecessary salts.
Integration with the Hesi hydro and coco flowering programs
PK 13/14 always works alongside the base flowering fertiliser: Hesi Hydro Bloom for hydroponic systems or Hesi Coco for coco substrate cultivation. Introduce PK 13/14 from the second half of the flowering phase and progressively increase the dosage over the remaining weeks. Discontinue one week before harvest and flush with clean water to allow the plant to metabolise residual salts from the root zone. Monitor EC after each addition – in unbuffered systems, precise measurement is the foundation of successful PK management.
PK 13/14 versus Phosphorus Plus: substrate-specific formulations
The Hesi range maintains a strict separation between PK boosters by substrate type. PK 13/14 is exclusively for hydroponic and coco systems where nutrient delivery is direct and unbuffered. For soil cultivation, Hesi Phosphorus Plus provides the appropriate formulation, calibrated to soil's natural capacity to store and gradually release nutrients. Complement your flowering program with Hesi Boost to stimulate the flowering transition and support early bud formation before PK 13/14 supplementation begins, creating a complete progression from flower initiation through to harvest.
Order Hesi Pro-Line PK 13/14 at plantandflower.be, your Belgian growshop with fast shipping across Belgium. Precision PK management for maximum flowering performance on hydro and coco.
What is the dosage for Hesi PK 13/14?
Start with 2.5 ml per 10 litres at mid-bloom and progressively increase to a maximum of 15 ml per 10 litres during the final weeks. Always add PK 13/14 to your base flowering fertiliser and check EC after mixing. Discontinue one week before harvest and flush with clean water.
What is the difference between PK 13/14 and Phosphorus Plus?
PK 13/14 is formulated for hydroponic and coco systems – unbuffered media where nutrient solution reaches roots directly. Phosphorus Plus is designed for soil cultivation, accounting for soil's natural nutrient buffering capacity. The two products have different compositions and are not interchangeable between substrate types.
Why should PK 13/14 dosage be increased gradually?
In hydroponic and coco systems, there is no substrate buffer between the nutrient solution and the roots. A sudden high PK concentration can block calcium and magnesium uptake and cause salt stress. Progressive dosage increase allows the plant to adapt to rising phosphorus and potassium levels without disrupting the overall ion balance.
Can I combine Hesi PK 13/14 with Hesi Boost?
Yes, PK 13/14 and Hesi Boost are complementary products in the Hesi flowering program. Boost stimulates the flowering transition and supports early bud development, while PK 13/14 supplies the escalating phosphorus and potassium demand from mid-bloom onwards. Follow the Hesi grow schedule for optimal timing and dosage of both products.
