Rockwool, sprouts and nutes - when and how much?

Hey all
I am about to put some germinated seeds in rock wool - I have soaked the rock wool in lowered ph water for a while so they should be pretty much ok in ph.

The guy at the Hydro store says half strength nutes in the water as soon as I see the first real leaves coming through - not the sprout leaves. He says just dunk the rockwool to push out old O2 and pull in some fresh O2

Anybody care to comment on that?

Cheers

Bump - hey any info would be great

Dunking about halfway works great, time consuming if you have a bunch of em though.

Once they have there first set of true leaves, mix nutes to PPM of 300-350(dont forget to include your background PPM) with veg nutes, also I through in some superthrive, and B1.

PH to 5.8 after adding nutes.

Cheers.

Rockwool can be too wet for healthy growth. I set mine in a cup on top of some perlite, then water the perlite instead of watering the cube; same with RapidRooters- my luck has improved doing it this way. I just put some germed seeds in cubes and put them in a clone dome- they loved it.

ganjagoddess said:

Dunking about halfway works great, time consuming if you have a bunch of em though.

Once they have there first set of true leaves, mix nutes to PPM of 300-350(dont forget to include your background PPM) with veg nutes, also I through in some superthrive, and B1.

PH to 5.8 after adding nutes.

Cheers.

Click to expand...

Hey -thanks - I don't have a way of measuring PPM just yet - can you give that in mls per litre?

Cheers

300-400 Ppm would be about 1/4 strength of manufacturers reccomendation on the back of the bottle.

But this isnt really accounting for background PPM of the tap water, which well assume is 200 right out the facet.

So go 1/5-1/8 manufacturers rec for the first week, then slowly go up and up the following weeks to 1/2 strength.

Because you dont have PPM testing, I wouldnt go to full strength.

ganjagoddess said:

300-400 Ppm would be about 1/4 strength of manufacturers reccomendation on the back of the bottle.

But this isnt really accounting for background PPM of the tap water, which well assume is 200 right out the facet.

So go 1/5-1/8 manufacturers rec for the first week, then slowly go up and up the following weeks to 1/2 strength.

Because you dont have PPM testing, I wouldnt go to full strength.

Click to expand...

Hey - thanks Ganja- I am using distilled water so I guess 1/5 - 1/8 will be cool - do you wait until the first leaves look like leaves, or until you see them start to form near the split between the first sprout leaves

Prolly a dumb question, but I don't have an endless supply of bag seeds

Distilled water has PPm of 2-15 so practically zero, go for 1/4 strength you should be fine.

As for the leaves it pretty much indistiguishable, not the big floppy looking tounges but the first real leaves...