Use Epsom Salt to lower PH... It has Sulphur which is acidic.
Just watch out for Sulphur Toxicity which will stunt overall growth and Magnesium Toxicity (RARE) which will cause nutrient lockout.
Sulphur Toxicity will be displayed as yellowing or burned leaf edges.
Magnesium Toxicity is rare...
The CO2 in the seltzer water doesn't last very long, but you can make CO2 yourself.
Mix 2 cups of sugar and one package of yeast in a 2 liter bottle and fill with water. in a few hours it will start to produce CO2.
Drill a hole in the cap to insert some plastic tubing. Loop your tubing around...
You can use dolomitic lime to raise PH up to 7 or so, or you can use garden sulfur to lower your PH. Home Depot should have both no matter what season you are in.
Only top your plants when they are in the vegetative cycle. I wouldn't top them during the flowering cycles. The plant will use it's energy to repair itself instead of bud production.
In the vegetative state you can top them when you start feeding them (about 2 to 3 nodes). Make sure to...
Yes, this way will be more effective and prolong the life of your ballast by giving cooler cleaner air.
I am of course assuming you are using some sort of ballast light (MH or HPS) with a hood and not CFLs, LEDs, or floro tubes.
I would draw the heat away from the light setup using its own fan with the intake bringing in cooler air at one end and drawing warmer air out through the exhaust end where your fan should be.
Re: Outdoor grow shed??
I would go to radio shack and buy a couple computer fans because they use little electricity and produce little sound. Anything will do really. You just need to place them on opposite sides of your nursery so good air comes in pushing out the bad. Also you want to...
If you use the heating and pressing method I promise you'll be very happy with flavor change. I only heat it for 10 minutes at 175* F. THC vaporizes at 360* F, so don't go over about 325* F or so.
I agree with this theory. I stopped feeding my plants at the same time and harvested them at 3 different times without flushing. About a month passed between 1st and last harvest. The first batch really crackled and tasted awful like pine-sol. The last batch doesn't really crackle and does...