1 kg sachet of DryPart Bloom, mineral bloom fertiliser in powder form NPK 6-17-15, front view

The two DryPart sachets placed side by side, the growth formula on the left and the flowering one on the right

DryPart Bloom doses in pre-flowering and flowering, in hydroponics and in soil, with the conductivity of each stage

DryPart programme from flowering to harvest, with ripening fertiliser and final flush, in hydroponics and in soil

Mineral flowering fertiliser in powder form, NPK 6-17-15

Name: Mineral flowering fertiliser in powder form, NPK 6-17-15
Brand: Terra Aquatica
SKU: TA-DPB-1000
Price: 7600.0 JPY
Availability: InStock

¥7,600

¥2,533 × 3 with no fees Klarna.

This mineral flowering powder, NPK 6-17-15, takes over from the growth formula from pre-flowering onwards and supplies the phosphorus and potassium that flowers and fruit need, with 7% calcium and 7% magnesium. It is dosed at 1.8 g per litre at full flowering.

It can be used in hydroponics, on coco fibre and in soil, up to ripening, 10 to 15 days before harvest.

Ref. TA-DPB-1000·Hydroponic fertiliser

Format : 1 kg

1 kg

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The summary

In the parcel: one 1 kg sachet of soluble mineral powder, NPK 6-17-15.
The follow-on: 0.8 g of each formula per litre in pre-flowering, then 1.8 g of this powder alone in flowering.
The end of the cycle: a nitrogen-free fertiliser replaces the powder for the last 10 to 15 days.
Storage: sachet resealed, kept dry, below 30 °C and away from flames.

Mineral powder rich in phosphorus and potassium, from pre-flowering through to fruit set

DryPart Bloom is the flowering formula of the DryPart mineral powder fertiliser, with an NPK 6-17-15 formulation. When the plant forms its buds, it slows foliage production and uses more phosphorus and potassium, and this powder follows that change. It contains half as much nitrogen as the NPK 12-6-16 growth formula, but nearly three times as much phosphorus. It remains complete, with 7% calcium oxide, 7% magnesium oxide and 14% sulphur trioxide, so you do not need to add any other fertiliser during flowering.

🌸 Pre-flowering, then flowering

In hydroponics and on coco fibre, the transition happens in two stages. In pre-flowering, you dissolve 0.8 g of DryPart Bloom and 0.8 g of DryPart Grow per litre, which brings the conductivity of the solution to 1.6 to 1.9 mS. Once the flowers have formed, the growth formula is dropped and DryPart Bloom goes on alone at 1.8 g per litre, for a conductivity of 1.8 to 2.2 mS. For these two stages, the pH of the solution is set between 6.4 and 6.8, and no longer between 5.5 and 6.5 as during growth. For the last 10 to 13 days before harvest, a nitrogen-free ripening fertiliser takes its place, which causes a deliberate nitrogen deficiency and focuses the end of the cycle on the flowers and fruit. For a 60-litre reservoir, the quantities break down as follows.

Pre-flowering

You dissolve 48 g of DryPart Bloom and 48 g of DryPart Grow.

Flowering

DryPart Bloom on its own comes to 108 g for the 60 litres.

The last 10 days

You pour in 300 ml of ripening fertiliser, at 5 ml per litre.

Store the sachet away from heat and naked flames

DryPart Bloom is classified as an oxidising agent, which means that in a fire the powder can make the blaze worse. Store the resealed sachet in a dry place below 30 °C, away from combustible materials such as cardboard or wood, and out of the reach of children. The powder also causes serious eye damage, so wear goggles when dosing it and rinse thoroughly with water in the event of a splash.

Finish the crop with a nitrogen-free fertiliser

During the last 10 to 15 days, the nitrogen-free late-flowering fertiliser, NPK 0-6-5, replaces DryPart Bloom, at 5 ml per litre for about ten days in hydroponics and at 4 ml per litre for 15 days in soil. Deprived of nitrogen, the plant stops producing leaves and devotes its reserves to the flowers and fruit, which finish ripening. If you prefer to stay with a powder, the late-flowering fertiliser in powder form is dosed at 2 g per litre, or 1.5 g in soil.

🪴 In soil and in pots

In soil, the application chart provides for doses about a quarter lower. Pre-flowering is run with 0.6 g of each formula per litre, then DryPart Bloom is used alone at 1.3 g per litre in flowering, for a conductivity of 1.3 to 1.7 mS. For a potted tomato plant watered with a 5-litre watering can, you therefore dissolve 6.5 g of powder at each flowering feed, weighed to the gram on kitchen scales. The guide to growing tomatoes completes this programme with pruning and pollination of your plants.

🧪 Calcium and phosphorus together

In multi-part liquid fertilisers, the calcium is packaged separately because, when concentrated alongside phosphorus and sulphates, it forms insoluble compounds. Yet DryPart Bloom combines 17% phosphorus pentoxide, 7% calcium oxide and 14% sulphur trioxide in a single powder. In dry form, these elements sit side by side without reacting, and they only meet in solution once diluted to the working dose. You should therefore always add the powder to the full volume of water in the reservoir or watering can, and never to the bottom of a bucket to make up a stock solution, where part of the fertiliser would become insoluble.

📦 The 1 kg bag

At 1.8 g per litre, the full-bloom dose in hydroponics, the 1 kg bag makes up about 555 litres of solution, and about 770 litres in soil, where the dose is 1.3 g. Once opened, you can keep it for 2 years, resealed and dry, at a temperature not exceeding 30 °C, above which the powder tends to solidify. It may also form lumps in storage, which does not affect its effectiveness.

Technical specifications

The formula

NPK: 6-17-15Mainly phosphorus and potassium
Total nitrogen: 6 %Of which 5.4% nitrate nitrogen
Calcium and magnesium: 7% CaO, 7% MgO
Sulphur: 14 % SO3

Use

Flowering: 1.8 g/L1.3 g/L in soil
Pre-flowering: 0.8 g/LWith 0.8 g/L of DryPart Grow, 0.6 g/L of each in soil
Target conductivity: 1.8 to 2.2 mSIn flowering, 1.3 to 1.7 mS in soil
End of cycle: Stop 10 to 15 days before harvest10 days in hydroponics, 15 in soil, with a nitrogen-free fertiliser

The sachet

Capacity: 1 kgApproximately 555 L of solution at 1.8 g/L
Storage: Keep dry, below 30 °CAway from combustible materials
Hazard classification: DangerH272 oxidising, H318 serious eye damage
Organic farming: Not suitable

To budget for separately

Growth version: DryPart Grow, NPK 12-6-16
Ripening: A late-bloom fertiliser

6 further specifications are available in the detailed view.

In the box

1 sachet of 1 kg of soluble powder

Composition, doses, conductivities and storage recorded on 05/10/2026 from the manufacturer's product sheet, its 2022 and 2025 application tables and its safety data sheet dated 08/01/2024.

Three ways to feed the flowering stage

Three complete one-part flowering fertilisers from the same manufacturer. What sets them apart is their form, their origin and their phosphorus content.

Mineral powder, organic or liquid? Describe your plants in flower, and the table highlights the suitable fertiliser.

	Nitrogen (N) (%)	Phosphorus (P2O5) (%)	Potassium (K2O) (%)	Shape	Suitable for organic farming	Dose at full flowering	Small size to try out	Hazard classification	Price
Mineral flowering fertiliser in powder form, NPK 6-17-15Your choice	6 %	17 %	15 %	powder	No	1.8 g/L	No	Danger	¥7,600
Soluble powder organic bloom fertiliser, NPK 3-6-9Your choice	3 %	6 %	9 %	powder	Yes	1 to 1.2 g/L	Yes	Uncategorised	¥6,900
Liquid bloom fertiliser in a single bottle, NPK 4-8-7Your choice	4 %	8 %	7 %	liquid	No	2.5 ml/L	Yes	Danger	¥4,900

Mineral flowering fertiliser in powder form, NPK 6-17-15

The formula

Nitrogen (N) (%)6 %

Phosphorus (P2O5) (%)17 %

Potassium (K2O) (%)15 %

Shapepowder

Suitable for organic farmingNo

Use

Dose at full flowering1.8 g/L

Small size to try outNo

Hazard classificationDanger

Soluble powder organic bloom fertiliser, NPK 3-6-9

The formula

Nitrogen (N) (%)3 %

Phosphorus (P2O5) (%)6 %

Potassium (K2O) (%)9 %

Shapepowder

Suitable for organic farmingYes

Use

Dose at full flowering1 to 1.2 g/L

Small size to try outYes

Hazard classificationUncategorised

Liquid bloom fertiliser in a single bottle, NPK 4-8-7

The formula

Nitrogen (N) (%)4 %

Phosphorus (P2O5) (%)8 %

Potassium (K2O) (%)7 %

Shapeliquid

Suitable for organic farmingNo

Use

Dose at full flowering2.5 ml/L

Small size to try outYes

Hazard classificationDanger

Compositions, doses, sizes and rankings recorded on 05/10/2026 from the three product sheets and the manufacturer's 2025 application chart.

Product videos

Growth and flowering with DryPart

DryPart, growth and bloom in powder form

Documents & manuals

Safety data sheet for DryPart Bloom

The sheet details the composition, the oxidising nature, storage and first aid.

PDF · 0,2 Mo

Download

Estimate your
delivery time

Sachet dispatched by tracked parcel from France. Exact shipping costs and final delivery times are displayed at checkout once your address has been entered. Outside the European Union, import duties and taxes are the responsibility of the recipient.

Frequently asked questions

8 questions

6 key questions, 8 in the detailed view

When should you switch from the growth formula to DryPart Bloom?

What doses for soil and for coco fibre?

The application table provides for lower doses in soil.

Stage	Hydro and coir	Soil
Pre-flowering, with DryPart Grow	0.8 g/L	0.6 g/L
Flowering	1.8 g/L	1.3 g/L
Conductivity in flowering	1.8 to 2.2 mS	1.3 to 1.7 mS

Can a bloom booster be added to it?

Is it suitable for very soft water or rainwater?

What is the difference from Organic DryPart Bloom?

Can it be given to tomatoes in an aquaponic system?

Why does phosphorus dominate in this formula?

How many grams for a 10-litre watering can?

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Mineral flowering fertiliser in powder form, NPK 6-17-15

The summary