Atami B'Cuzz Hydro Feed Chart – A&B and PK Doses
Atami's own published B'Cuzz Hydro Nutrient A&B schedule for hydroponic systems. Week by week, in millilitres per 100 litres of water.
- All dosesper 100 litres
- pH and EC5.5 – 5.8 · EC 1.0 – 2.2
- Base feed75-100ml rising to 200-300ml, each part
Every figure is millilitres per 100 litres of water. Atami wrote this one for a tank, so if your reservoir holds 100 litres the figures go in as printed. For anything smaller, scale by the volume: a 50-litre tank takes half, and a 10-litre can takes a tenth, so the 200-300ml of Nutrient A at Flower 2 is 20-30ml in a 10-litre can.
Getting it right
- Dose to the water in the tank, not to the tank's size. Fill it, note how many litres actually went in, then work the figures out on that. A part-full reservoir dosed for a full one is a burnt crop.
- A and B never touch each other neat. Nutrient A into the water first with the pump running, then Nutrient B once it is mixed through. Undiluted they react and the calcium drops out as sludge.
- The reservoir changes on its own between feeds. Plants drink water and nutrient at different speeds, so the EC and pH you set on Monday will not be the ones you read on Wednesday. Check both daily and correct.
- Top up with plain water, not feed. As the level drops, plain water brings the EC back towards where you set it. Adding more nutrient to a shrinking tank drives it the wrong way.
- Empty and remix rather than chasing an old tank. Once a week is normal. Salts build up in a recirculating system in a way they never do when you feed by hand and let it run to waste.
- Keep it cool and aerated. Roots sitting in solution need oxygen, and warm water holds less of it. An air pump running around the clock and a tank out of the light do most of the work.
- Flowering starts at Flower 1 on this chart. Atami number their own schedule week 1 to week 10 straight through, so the switch is placed where Root Stimulator stops and Bloom Stimulator starts — their week 3. Root Stimulator runs Grow 1 to Grow 2, Growth Stimulator ends at Flower 4, Bloom Stimulator starts at Flower 1, and PK 13/14 runs Flower 3 to Flower 7.
- Flower 8 drops the PK. Base feed and Bloom Stimulator carry on to the end. Atami print no plain-water week here, so a finish on plain water is a week of your own.
Everything on the chart
Hydro Nutrition A&B
From £11.49
75-300ml of each part, Grow 1 to Flower 8
B'Cuzz Root Stimulator
From £14.49
100ml, Grow 1–2
Bloom Stimulator
From £28.49
100ml to 200ml, Flower 1–8
Atami PK 13/14
From £7.90
150ml, Flower 3–7
Common questions
My reservoir is not 100 litres — what do I add?
Scale by the water you actually put in. A 50-litre tank takes half of each figure, a 25-litre tank a quarter, and a 10-litre can a tenth. Measure Nutrient A and Nutrient B separately and use the same amount of each.
How often should I change the tank?
Weekly is the usual answer, and sooner if the EC is climbing while the level drops. In between, top up with plain water and correct the pH rather than adding more feed.
Which week does flowering start?
Atami's own schedule runs week 1 to week 10 with no line between veg and flower. On this chart the switch is placed at their week 3, where Root Stimulator stops and Bloom Stimulator starts, and the flower weeks are numbered from there. Flower 3 is the biggest change on it: PK 13/14 comes in and Bloom Stimulator steps up.
Growing in coco instead?
Atami publish a separate chart for coco at different rates — see the B'Cuzz Coco feed chart.
The chart lists a Growth Stimulator — why is it not in the list above?
We do not stock the B'Cuzz Growth Stimulator at the moment, so we have not linked it. Everything else on the chart is above.
Figures as published by Atami on their own B'Cuzz Nutrients Feeding Schedule, atami.com. Always read the label on the bottle you own. Atami is a trade mark of its owner.