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the soil is straight mgmc + verm + perlite, no ferts. i've been watering with pH ~6.5 water on a proper schedule. i dont think the leaves are burning, its just under a single 26W CFL about 3" away from the uppermost leaves. conditions are 79-81*F and 55-65% humidity consistently. what am i doing wrong?
What are your peak temps during the photoperiod and min at night? The plant leaves tend to curl upwards when they are transpiring to keep cool. Although with the temps you gave and the CFL being used, you shouldnt be having this problem. What is your watering schedule and amount use? Does you grow area have efficient ventilation?
The only advice I can give you at the moment would be to try to drop the peak temp down around 75-76 degrees F, properply ventilate the grow area, and maybe water a little more often.
Perlite and vermiculite both provide aeration and drainage, perlite tends to last longer, has a more neutral pH, and functions much better in hydroponics, outdoor applications.
Perlite is neutral. Vermiculite is neutral or alkaline (7.0-9.5) owing to the presence of associated carbonate compounds. It will vary according to the processing technique and time, and with the presence of moisture. The pH, color and chemical composition of vermiculite also will vary from mine to mine.
Medium grade vermiculite is the standard among professionals for horticultural uses including the rooting of cuttings. It possesses cation exchange properties, thus it can hold and make available to the growing plant ammonium, potassium, calcium and magnesium. The main difference is perlite tends to be stronger.
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