Hi Nick. If you happen to know, would you be able to confirm for me whether the ‘fertilization’ claims regarding these rocks is based on a supposed overall CEC improvement they provide? Cation Exchange Capacity is, if I recall correctly, what the acronym “CEC” refers to, and based on my extraordinarily minimal knowledge of the science involved, this is my guess at how the magic rocks work.
I’m interested because I’ve been playing with the concept myself a little bit, in an effort to understand how a
gardener ought best think of the process, if he ought think of it at all.
You too can have a green giant in 4 weeks flat, dear Azimuth. Fret not.
Beware! above link is for Canadian Amazon store, reference only for others.
As far as the nursery bags go they tend to advertise the flat measurement up front, ie the measurement before unfolded and filled, which can be confusing. I bought a variety pack so I could find the right size then bought some more of the right ones.
The size(s) I use are all under 10 inches on both flat measurements. I’m of the opinion that anything in the 6-7inches x 8-9inches flat measurement is your sweet-spot.
I’m dead-sold on these little guys but they take some getting used to. BTW one way to feed the seedling if you don’t want to feed via the bowl-water, or include fert into the grow matrix, is to load up a spray bottle with a weak dose of GH or MC, or your favourite, and spray the outside of the bag with it.
I would limit the application of biologicals (esp liquid forms) to some VitB, because you don’t want any algae growing on there if you can help it. My LiquiDirt will
algae if applied this way. By all means, add your frass, and activate with LABs, but make sure something immediately available to the plant is in the mix too or you won’t get far past a couple of nodes before she runs out of gas on you.
The spraying of a synth-based nute to the bag (or just mixing with the water in the bowl) or mixing in a couple of pinches of organic tomato fert. seemed to have worked equally well for me.
I'm interested to hear how others feed their seedlings. Remember here that we’re trying to create a mini SIP, you need the water level to come no higher than an inch below your bag’s base to prevent giving her permanently over-wet feet. Spraying every few days with fertilizer seems to keep those roots growing like mad and doesn’t interfere too radically with your attempted moisture gradient. It all comes pretty easily after a couple go’s, I found. It’s weird, I know, but it works and I’m quite convinced after doing with multiple strains, tomatoes and cucumbers that it works a treat and keeps growth from stalling during adaptation periods after transplant into main SIP.
BTW I’ve switched over fully to the ‘faux-cto-pot’ design I posted here, from my 27gal tote SIPs with 2 10gal in them. The Faux-cto’s sport a plastic 7 gal or 7-10 gal soft pot, and carry 8-9 gallons in rez for each plant. A huge air gap is provided and my level gauge made from take out chop sticks and aerocloner foam discs works a treat. Turns out no structural supports are required either as I’ve two very large GG#4s happily sitting in 7 gals wet Promix with no issues. It’s similar to what
@Emilya Green has recently done but is carrying a great deal more fertigation (or water) on-board. Construction is a doddle. Here’s inside one empty: