Atami - Premium Plant Powder Coco

A chelated bio-mineral base nutrient in powder form for coco substrates, in a 1 kg bag. Dose 0.5 to 1 gram per litre of water, measured out on EC.

Coco releases potassium and is low in calcium

This is why a separate coco version exists, and it is a property of the substrate rather than of the bottle.

Atami explain it themselves on their coco nutrition: when growing in coco, potassium is gradually released from the substrate to the plant, while coco substrates are usually poor in calcium. A feed used on coco therefore has to lean the other way from one used in soil: relatively less potassium, and more calcium to stay ahead of the shortage.

So this powder is not the Soil version with a different label. Feed coco with something calculated for soil and you are adding potassium on top of potassium the substrate already supplies, while the calcium that is actually in demand lags behind. Many coco growers know the pattern that follows: symptoms that look like a calcium shortage, on a schedule that is complete on paper.

Where that potassium comes from also has a timeline. A buffered and washed coco substrate behaves differently from an unbuffered one, because buffering is precisely the process in which the manufacturer lets that exchange happen in advance. If you do not know which one you have, that is the first thing to find out.

Dosing on EC

As with the other two powders you work from an EC figure here rather than from millilitres. Atami state that every 0.1 gram raises the EC of a litre of nutrient solution by 0.09 mS/cm.

So measure your tap water first, set your target, and convert the difference into grams. The range runs from 0.5 to 1 gram per litre, which comes to roughly 0.45 to 0.9 mS/cm on top of what is already in your water.

A scale is more useful here than a measuring scoop, not least because the difference between the bottom and the top of the range is exactly a doubling.

What is in it

Atami describe the range as chelated mineral plant nutrients in powder form, with calcium and with magnesium, which they call the key element in photosynthesis. On this version the calcium is the element carrying the difference from the other two.

It is a one-component feed for the whole cycle. Add it from the growth phase onwards, give it daily with the irrigation water, and according to Atami best in combination with their bio-stimulators.

Packaging and storage

The bag holds 1 kg. If you come across a different weight elsewhere, that refers to an older pack from before Atami standardised the size.

The packaging is light tight. Store closed, dark and at room temperature, because powder draws moisture and clumps from it.

Technical Specifications:

• Type: chelated bio-mineral one-component nutrient in powder form
• Manufacturer: Atami
• Substrate: coco substrates and coco mats only
• Contents: 1 kg
• Dosage: 0.5 to 1 gram per litre of water
• EC: every 0.1 gram raises EC by 0.09 mS/cm per litre
• Period: from the growth phase, throughout the cycle
• Frequency: daily with the irrigation water
• Contains among others: calcium and magnesium
• Product code: 11.039
• Storage: closed, dark, at room temperature

Frequently asked questions

Why can I not use the Soil version on coco?
Because coco releases potassium of its own and is low in calcium. A soil feed leans the other way, so you stack potassium while the calcium lags.

I see calcium symptoms although my schedule is complete.
On coco that is the familiar pattern. Check first that you are using the coco version and whether your substrate is buffered.

How many grams per litre?
0.5 to 1 gram. Work from your target: 0.1 gram adds 0.09 mS/cm per litre.

How much is in a bag?
One kilo. If an older listing shows a different weight, that belongs to the pack from before standardisation.

Do I still need cal-mag alongside it?
This version is already matched to the calcium story of coco. Measure and look at your crop before adding anything extra, because doubling up also lifts your EC.