lighting for maximum females

R

Rhyspect

Active Member
ok guy's i have a little problem, I keep growing males and so i'm determined to grow a female this time, and i have heard that if you give a seedling less hours of light it will grow into a female,
1. is this true?
2. what hours of light would you specify (feminised seedling about 3 day's old from germination)
3. are there any other tips and tricks you know of, without spending a considerable amount of money?
4. where do i get blue spectrum cfl bulbs? (about 100watt)

extra info: i use cfl lighting with mylar coated box with a small CO2 generator(yeast, sugar and water in a bottle) i grow in soil, and use a fertiliser at about 3 noads called phostrogen, which is nitrogen, phosphate, potash, "trace elements" i am also forcing the plant to flower early due to my small grow space... which means any plant i grow will be about as tall as a lowryder and scrog'd, if you need any more info please ask...
 
TalonToker

TalonToker

Well-Known Member
A while back I was growing 2 plants at a time and I grew 6 consecutive males. That's just the way it goes, sometimes.
 
bigv1976

bigv1976

Well-Known Member
Here is some concrete info.


40. PERCENTAGE OF FEMALES

From literature it appears that the growth of a male or female plant from seed, except for the predisposition in the gender chromosomes, also depends on various environmental factors. For growers who are well experienced, percentage of female plants is 60% - 90% female, but less experienced growers can end up with 100% male plants. The environmental factors that, according to literature, influence gender are:
- a higher nitrogen concentration will give more females (at the three-pairs-of-leaves stage and continue for two or three weeks).
- a higher potassium concentration will give more males (at the three-pairs-of-leaves stage and continue for two or three weeks).
- a higher humidity will give more females (at the three-pairs-of-leaves stage and continue for two or three weeks).
- a lower temperature will give more females (at the three-pairs-of-leaves stage and continue for two or three weeks).
- more blue light will give more females (at the three-pairs-of-leaves stage and continue for two or three weeks). - Fewer hours of light will give more females (at the three-pairs-of-leaves stage and continue for two or three weeks). - In later stage, as you increase the light, the plants grow faster and show more females/less males. Sixteen hours of light per day seems to be the best combination, beyond this makes little or no appreciable difference in the plant quality.
- Another idea is to interrupt the night cycle with about one hour of light. This gives you more females.
- Spray dilute Fish Emulsion ( 1 tablespoon per gallon ). When the plants have three sets of true leaves, plus the top sprout, give them a wetting spray of Fish Emulsion. Do it once a day for three of four days. Top and bottom of the leaves.
- To achieve 100% female plants is to expose young seedlings for several hours to an atmosphere of Carbon Monoxide. It doesn't hurt the plants, but it could kill you.
- Treatment of hempseed with ethylene gas will increase the resulting number of female plants by about 50%. Ethylene is produced by certain plants (i.e., bananas, cucumbers and melons), and these can be used to treat hempseed in a simple manner. About two weeks before you plan to sprout the seeds, place them in a paper bag or envelope and put that in a plastic bag with the peels of a ripening banana or cucumber. Replace the peels after a couple of days, and change the bags to prevent mold.
- When hempseed is treated with the female hormone estrogen, percentage of females that are produced will increase by about 10%. Dissolve a birth control pill in water and soak the seeds overnight in the solution. After the initial soaking, continue to treat the seeds by sprouting them on a paper towel soaked in the solution.

 
R

Rhyspect

Active Member
NLXSK1 said:
It is not true. You have a male or female seed. Light does not help choose sex.
Click to expand...
it just seems to be against impossible odds, i've grown 6 males in a row, and i hear that most experienced growers can get a 60% ratio of females to males, and feminising only works to 80% effectiveness, what your saying isn't impossible, i just think it's more likely that lighting is a factor.
 
R

Rhyspect

Active Member
bigv1976 said:
Here is some concrete info.


40. PERCENTAGE OF FEMALES

From literature it appears that the growth of a male or female plant from seed, except for the predisposition in the gender chromosomes, also depends on various environmental factors. For growers who are well experienced, percentage of female plants is 60% - 90% female, but less experienced growers can end up with 100% male plants. The environmental factors that, according to literature, influence gender are:
- a higher nitrogen concentration will give more females (at the three-pairs-of-leaves stage and continue for two or three weeks).
- a higher potassium concentration will give more males (at the three-pairs-of-leaves stage and continue for two or three weeks).
- a higher humidity will give more females (at the three-pairs-of-leaves stage and continue for two or three weeks).
- a lower temperature will give more females (at the three-pairs-of-leaves stage and continue for two or three weeks).
- more blue light will give more females (at the three-pairs-of-leaves stage and continue for two or three weeks). - Fewer hours of light will give more females (at the three-pairs-of-leaves stage and continue for two or three weeks). - In later stage, as you increase the light, the plants grow faster and show more females/less males. Sixteen hours of light per day seems to be the best combination, beyond this makes little or no appreciable difference in the plant quality.
- Another idea is to interrupt the night cycle with about one hour of light. This gives you more females.
- Spray dilute Fish Emulsion ( 1 tablespoon per gallon ). When the plants have three sets of true leaves, plus the top sprout, give them a wetting spray of Fish Emulsion. Do it once a day for three of four days. Top and bottom of the leaves.
- To achieve 100% female plants is to expose young seedlings for several hours to an atmosphere of Carbon Monoxide. It doesn't hurt the plants, but it could kill you.
- Treatment of hempseed with ethylene gas will increase the resulting number of female plants by about 50%. Ethylene is produced by certain plants (i.e., bananas, cucumbers and melons), and these can be used to treat hempseed in a simple manner. About two weeks before you plan to sprout the seeds, place them in a paper bag or envelope and put that in a plastic bag with the peels of a ripening banana or cucumber. Replace the peels after a couple of days, and change the bags to prevent mold.
- When hempseed is treated with the female hormone estrogen, percentage of females that are produced will increase by about 10%. Dissolve a birth control pill in water and soak the seeds overnight in the solution. After the initial soaking, continue to treat the seeds by sprouting them on a paper towel soaked in the solution.

Click to expand...
some of this stuff is bull, if you expose plants to an hour a night of light it stresses the plant out and makes a hermi. that's a bad thing, and im pritty sure carbon monoxide will kill your plants as they wouldn't be able to breath.
 
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