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Offlineyellownotepad
Pharmaceutical Agriculturalist
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Registered: 06/22/08
Posts: 1,702
Last seen: 11 years, 11 months
margins curling upwards
    #74138 - 07/06/08 09:49 PM (15 years, 10 months ago)

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?


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Offlinem3kgt
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Registered: 04/29/08
Posts: 1,011
Loc: G-Spot TX
Last seen: 6 years, 11 months
Re: margins curling upwards [Re: yellownotepad]
    #75758 - 07/08/08 06:42 AM (15 years, 10 months ago)

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.


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Offlineimpgl

Registered: 04/20/08
Posts: 1,666
Last seen: 11 years, 2 months
Re: margins curling upwards [Re: m3kgt]
    #103198 - 08/05/08 03:26 AM (15 years, 9 months ago)

whats mgmc?


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Invisiblecaptain.koons
Failed Botanist
Registered: 06/25/08
Posts: 6,170
Trusted Cultivator
Re: margins curling upwards [Re: impgl]
    #103223 - 08/05/08 07:47 AM (15 years, 9 months ago)

mgmc = miracle grow moisture control

why do people add verm? adding perlite is to airate and fluff up your mix to achieve airation and drainage and verm does the opposite.


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Offlineerb
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Registered: 04/20/08
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Last seen: 13 years, 3 months
Re: margins curling upwards [Re: captain.koons]
    #132695 - 10/15/08 11:59 AM (15 years, 7 months ago)

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.

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Invisiblecaptain.koons
Failed Botanist
Registered: 06/25/08
Posts: 6,170
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Re: margins curling upwards [Re: erb]
    #132781 - 10/15/08 04:31 PM (15 years, 7 months ago)

Vermiculite and perlite are both pH neutral aren't they?

Everyone I've talked to says vermiculite does more harm than good and should only be used outdoors or for whicking action in hydroponics.


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Offlineerb
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Registered: 04/20/08
Posts: 198
Last seen: 13 years, 3 months
Re: margins curling upwards [Re: captain.koons]
    #132807 - 10/15/08 05:56 PM (15 years, 7 months ago)

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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