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Farmers Lab Advanced Theories and Techniques - Got a few grows under your belt and want to discuss more advanced theories and techniques? Discuss these matters here.

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Old 08-08-2013, 01:53 AM   #1 (permalink)
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August Sowing

Hi All

I'm really late this year but would like to take a plunge and trying sowing in august. where i live there is reasonable sunlight. I.e. sunset will be as early as 6pm till late October.

Temperatures will be ranging between mid 50s to mid 80's right to november.

Would like your thoughts

GM
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Old 08-08-2013, 06:21 AM   #2 (permalink)
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Light intensity and useful duration is falling rapidly now that we are into August. Starting your babies out for two weeks under artificial light might help them achieve some vegging growth. If you are far south of the Canadian border you may have a few extra weeks.
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Old 08-08-2013, 10:53 AM   #3 (permalink)
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thanks slunt. i'm far away from Canada. i'm near Islamabad!
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Old 08-08-2013, 11:36 AM   #4 (permalink)
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Oh wow, Islamabad! Thats cool. Well for best results you want the plants to do their veg growth with 18+ hours of light per 'day' cycle. So you might have to use electric lights for a few hours as the sun starts setting, not sure though as I live in the NW USA. To get them to start budding, they need 12 hours of light and 12 hours of darkness. Once again based on how long your days are now you may have to cover the plants to give them a long enough 'night'.

The temperatures sound ideal though, so that's a good thing. If you don't mind me asking, what sort of risks does cannabis growing entail for you, living near Islamabad?
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Old 08-08-2013, 03:42 PM   #5 (permalink)
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i think ya missed it man.

islamabad should be gettin about an hour less sun/day right now, fwiw
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Old 08-09-2013, 09:34 AM   #6 (permalink)
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in Islamabad the laws by the book are strict but there is not much enforcement as you can imagine. the cops have bigger issues like security and terrorism to worry about. besides Islamabad is full of wild marijuana. i mean its everywhere.

Which is why it is also a challenge. i have to go up in the mountains where is very little or no wild marijuana. i have a friend who owns some land up there. so when the plants are well in their vegetative state, i move them up before they are ready to flower.

sunrise is 4:15 am and sunset is 7pm, so pretty good day light but thanks for the advise on the lamps i thing i will have them exposed the more light in the beginning.

Question: what is the maximum light hour exposure is recommended per day?
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Old 08-09-2013, 09:43 AM   #7 (permalink)
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Oh yes. if i'm going to be buying lights. any suggestions? there is talk about LEDs being effective. can i buy regular LEDs or there are special growth LEDs?

Otherwise will fish for good old high pressure sodium lights.

Cheers!
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Old 08-09-2013, 10:20 AM   #8 (permalink)
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Maximum light per day: For veg growth, they can have anything from 24 hrs of light to as little as 18 hours of light per day. I think technically you can go as low as 14 hrs per day of light but you start getting diminished growth.

For flowering, the general rule is 12 hrs of light and 12 hrs of perfect dark. If the darkness isn't absolute, you risk having the plant stress out and form male flowers so it can self-pollinate.

I don't know a whole lot about LEDs, never used them. I know companies sell special plant growing LEDs but as far as what to look for and how to use them best I have no idea.
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Old 08-10-2013, 01:12 PM   #9 (permalink)
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thank you SmokeaJoint. will keep all posted on the developments. if nothing else, i will be happy with a few buds at the end of the day.
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Old 08-10-2013, 01:38 PM   #10 (permalink)
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While they do have special grow LED's the cost is still expensive as the new technology is in it's infant stage. Stick to HPS or Metal Halide. Florescent's are good for up to the first 8 inches of growth. A 400w should give you enough light intensity to grow a plant 18-24 inches. By then you are transplanting outside.Take a 1/2 hour off for morning sunrise and again at sunset and you have your daily dose of light exposure.15 hours between sunrise and sunset is really 14 hours of light. depending on genetics most plants will prepare to flower when the light exposure drops below 14 per day. Definitely flowering will begin by the 13 hour per day mark. hopefully wild , wind born pollen will not cause your girls to go to seed.
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Old 08-10-2013, 02:20 PM   #11 (permalink)
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thanks slunt. i was going to set up the mh lighting outdoors. and i keep the lights on 24/7 for the vegetative stage. the move/transplant in the mountains away from wild marijuana. there they will get 10hours or less light per day. so they will flower naturally. how does that sound?
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Old 08-10-2013, 03:58 PM   #12 (permalink)
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I think you could get successful flowering with a 10 hr light cycle, but for minimum amounts of additional effort you could give them extra 2 hours of strong artificial light and get much better end results.

As far as the wild herb pollen goes, weed is typically wind pollinated, though insects do have an effect as well. I'm going to assume that as long as the mountains are upwind from the wild cannabis, chances of pollination will be low. Of course, the next wild field's pollen 80 km away could also travel far enough. I'd hope for no seeds but expect at least some.
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Old 08-17-2013, 05:44 PM   #13 (permalink)
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24 hours of light isn't natural. Plants need a resting period. 16-18 hours ON max is my opinion.

Plant's are ALIVE just like the rest of us....they need to sleep too.

Drop it down to 12/12 when ready to flower and all will be fine.
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Old 08-18-2013, 06:08 AM   #14 (permalink)
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Eh, if you're only vegging for 4 weeks then they'll be just fine. Mother plants should be maintained at 16-18 hours light but for plain Jane producing plants, if you can keep up with their nutrient demands and all that, then you can get faster growth out of a 24 hr on cycle. Done it plenty of times.
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Old 08-18-2013, 07:18 AM   #15 (permalink)
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I agree 24 hr light on new veg plants works wonderful, always such vigorous rapid growth. Compared to same strain running 18 hr light, the differences were amazing... in the tests ive done.. I have used this technique for many years now. Keep the light tight (floros), is my motto..Nice fat bushy plants ready for planting in a month.
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Old 08-20-2013, 02:12 PM   #16 (permalink)
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24 hrs of light is not natural but one unusual ability of cannabis is to grow quite happily under perpetual light.

However it is better use of wattage to veg at 18 hrs of light per day IMO. The plants can't use 24 hrs with max efficiency. Give em a break and they work better .

Sativas can stretch angrily when put into 12/12 after being vegged at 24hrs.

-OP

Depends on the genetics to some extent, you want something indica perhaps to finish quickly.
In Islamabad you should be close to some shit hot indicas I bet lol.
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Old 09-10-2013, 02:27 PM   #17 (permalink)
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its great to hear from all the gurus. i have invested in 3 x 400 watts mh lamps placed outside for 12 plants. they are still about a couple inches (9 days). and recently moved from indoor flourescent tube lighting to outdoor natural light.

so will switch the mh lamps on when they are a bit bigger.

The sunrise is 5:45 and sunset is 6:20 so adding another 6 hours with the 3 lamps could help. temperatures are favourable. So i only need max vegetation before flowering is induced.

so i am hoping to give 18-24 hr light cycle for another 6-8 weeks. the ideal distance from the mh lamp, i have been told, is 12 inches. would like your views.

cheers!
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Old 09-10-2013, 05:26 PM   #18 (permalink)
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I recently read in a bonsai forum I joined that when using natural lighting, discount the first 30 minutes of sun rising and last 30 minutes while sun's setting as it doesn't give enough meaningful light to really do much. I suppose in lighting, what applies to dwarf pomegranates should apply to all plants.
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Old 09-13-2013, 06:33 AM   #19 (permalink)
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any advise on the distance from a 400 mh lamp? my seedlings are 3-4 inches tall.
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Old 09-13-2013, 09:24 AM   #20 (permalink)
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Name:  MetalHalide_chart.jpg
Views: 150
Size:  96.9 KB

Name:  HPS_chart.jpg
Views: 150
Size:  82.4 KB

Maybe these will help, one for HPS, one for MH.
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