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Whats the best way to test npk in soil?

I have a 3x3x6 grow tent with 2ft 8 bulb t5. I plan on addin a carbon filter and exhaust fan. Can anyone give me advice on a fan and filter. Tent has 4" vent ducts. LxWxH=54 so am I lookin at a fan to exhaust 54cfm a min? And how much cfm must I add to push the air thru the filter? Reps for...

I have a 3x3x6.5 grow tint. Econo wing reflector with 400 watt hps. I plan on adding a intake and exhaust with filter but I'm havin issues deciding if I should go with a 2ft 8 lamp T5. Only reason I'm considering is cause of the heat issues. Would it b worth goin with the T5s cause I can place...

I just ordered a 3x3x6.5 grow tent. I have right now a 400 watt HPS. I don't have a air cooled hood yet and I'm tryin to decide if I should go with T5 or a lower wattage so I don't have as much heat issues.I'm only using the tent for flowering. Can anyone give me advice?

Can u tell me how much ur dosing your plants or have dosed with gen hydro flora nutes? I'm growin in doil by the way and want to see what strengths have been used. I've only used what's on the bottles except I ran a extra tsp of bloom for couple weeks but I believe I got some nute burn.

Here are my two. Bout 6 days flowering. Veg 2 months under 400w HPS. Still working on gettin my watering right. Growing in soil with general hydro nutes. Lookin for opinions or advice if you catch something that i don.t notice being a nub. Thanks

Im looking to design a grow box. I am looking for your expreriance to help with my new project. Looking for stealth and cheap as possibe. Going to try and keep costs down with DIY ideas as well. I want a veg and flower grow box. I have a 400 watt HPS with econowing reflector. Im doin soil. I...

Need help with my plant. My leaves are dry and have yellowish brown in color. I just turned the lights back to 18/6. Humidity is low and temp is around 80. They are in fox farm ocean forrest soil.