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Vlad Jovanovic's Blog – January 2012 Archive (2)

Greenhouse Heating using Lights Update

Ok, so basically what I’ve found is that using the set-up described in the previous blog, is that I was able to obtain a 9-12 degC difference in air temps, in a 2.4 m3 space using just the heat off of the T-8’s, which were left running 24/7. This increased to 20+ degC when the 250MH kicked in (from 12 midnight till 7:30am). I was able to sprout over 100 plants split between 3 different cultivars. COS Romaine, Spinach, and a local variety of red/green lettuce. After sprouting, which took…

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Added by Vlad Jovanovic on January 10, 2012 at 9:00am — No Comments

Determining Homemade KOH (LYE) Concentrations

Ok, so everyone has to buffer their pH back up with something, right? Slaked/hydrated lime (CaOH), Potassium Hydroxide (KOH) (usually reserved for the big leagues, UVI, Neslon Pade type systems, and rightly so. KOH can be dangerous to work with as it is highly caustic and a very powerful buffer). With most folks by now settling on alternating between CaOH and KHCO3 (known to most folks as Potassium Bi-Carbonate, here, in this country, it is referred to as Potassium Acid Carbonate as…

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Added by Vlad Jovanovic on January 9, 2012 at 3:30pm — 8 Comments

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