A Tale of The Tape HPA vs 21st Century Flood and Drain

This update came in a couple hours ago from UVL

660s now available @ $19.95

From what I am seeing with 1/8, I would like to try 2/8

Found this sexing topic on another thread:

environmental factors play a lot into the fact of whether a plant is female or not you can begin influencing your plant's sex the moment the seedling has three pairs of true leaves (cotyledons don't count!)

This is from the Elite Growers Book: another thing a lot of you might be wondering why fem. seeds from seed companies don't follow the instructions from the picture that is because they all have hermaphrodite DNA they have lowered chances of hermie thru special breeding but especially all fem. seeds are hermie the better the environment the less chance of hermie

These factors are:

Humidity: High humidity increases the chances of female plant
development. Low humidity increases male plants. Low grow medium
moisture also increases males. The same is valid for the moistness of the
seedbed.

Temperature: lower temperatures make for a larger number of female
marijuana plants, higher temperatures for more male marijuana plants.

Lighting: More blue spectrum light energy increases the number of
females, whereas red light increases males. Fewer hours of
daylight(about 14) increases the number of female plants. Longer light
exposure(18 hours+) will tend to make more male plants.

Nitrogen: Increasing the level of nitrogen(N) makes more female
plants, lowering creates more males.

Potassium: Lowering levels of potassium(K) encourages the
development of female plants, increasing potassium(K) increases the
male tendencies. (So for the first two weeks a higher level of nitrogen
and a lower level of potassium will encourage female plants to develop.)

Environmental Stress. Any environmental stress will greatly increase
the chances of male plants growing from your seed.

Colour of Light: more blue light makes for female cannabis plants from
seed, more red light makes for more male cannabis plants.

Hours of Daylight: few hours of daylight(i.e. 14 hours) makes for
more female individuals, a long day(i.e. 18 hours) makes for more male
cannabis plants.

Soaking: Soaking your seed(s) in Gibberellic acid makes it/them more
likely to produce a female plant.

Great info pet...............Interesting about blue/red light spectrum and it's influence on sex............nice pics pet/ yeah I see your hairy forearm

Thought I would repost this as my plants have been getting ample 630 from 1 UVL Aquasun + 2 ZooMed florosuns + 3 UVL Red Lifes. Additionally I have 1/8 UVL 660 + 1 Coral Wave:

This is from an led discussion, but the spectral needs are the same no matter the lighting choice

Couple that with strong white light (green-response chlorophyll extending throughout and deep into leaf structures, with a net effect at or near that of the (mostly) surface-level blue and reds), which also takes care of most of the ~660nm+ you actually need for photomorphogenesis - and you can get by with 630nm reds just fine.

(i.e. 630nm red is ~95% of the PSR of 660nm, AND they currently still have ~20-30% greater radiometric efficiency - as well as being cheaper than the deep reds - so there's more 'bang for the buck'):

Apparently true for T5s too. The 660 MSRP being ~ 1/3 more expensive than the Red Life

delete double post

did you just find that book? thats the book that changed the way i grow... super usfule infor and what you state about fem seeds is 1000% correct hermie genes are prevented by proper environments that encourage females. a lot of people think that a hermie is hermie and its not thier fualt but more often than not it is because your conditions where not optimal. i have yet to get a hermie following those guidelines(and more) all my plants flower as if they are pure fem.

Originally Posted by polyarcturus

did you just find that book? thats the book that changed the way i grow... super usfule infor and what you state about fem seeds is 1000% correct hermie genes are prevented by proper environments that encourage females. a lot of people think that a hermie is hermie and its not thier fualt but more often than not it is because your conditions where not optimal. i have yet to get a hermie following those guidelines(and more) all my plants flower as if they are pure fem.

I have never had problems with fems either....much prefer them and have found that potency is more uniform with them....have grave doubts as to all these environmental factors influencing sex as that is a genetic determination already locked in PRIOR to germination...This is proven by the fact that chemical feminization is so highly successful in producing only FEMALE offspring. Also chemically induced gender switch to produce pollen does NOT employ the use of the "hermie" trait, it merely blocks ethylene by replacing the copper anions with silver which blocks ethylene...no ethylene means the plant can NOT grow female parts so it grows male...there is no strengthening or unintended promotion of the "hermie" trait and will only pass on whatever trait in that respect it would have whether fem or not....And I break alot of those "rules" in searching for the potency such as low rh, high temps, letting them thirst with fast drying medium, etc...matter of fact the only fem I have had herm was a Nirvana crap genetics strain...along with LOTS of landrace sativa herms from regulars seeds....but man the high so really didnt care bout the seeds

Not knocking the book or anything, rather just sharing some real botanical facts

I found a place with the wave point Ultra Growths for sale but man $31 a pop...already the damned arcadias are $45 per and only last about 7-8 months unless I veg really long then 6 months

http://www.aquacon.com/WavepointT5Lightbulbs.html
and the shipping on 4 bulbs is $50!! will be a while before if ever I try them

you are correct kite high ive come to the same conclusions genetically gender is locked in. but sexual expression is phenotypical as far as ive seen in the MJ plant i believe given the right conditions, any gender plant can express either gender exclusively. also kite high if you havent read the book you should look into it.

PLANT ULTRA GROWTHS ARE OUT!!!!!!!!!!!! i will getting some somewhere now.