08-19-2009, 08:34 PM
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| Sprout
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| Factors Affecting Sex of Plants | |
Quote:
Originally Posted by Diamond Dave  Does humidity determine sex? | Factors Affecting Sex of Plants
· - Environmental factors start influencing sex the moment the seedling has three pairs of true leaves (not counting cotyledons).
- · Increased levels of nitrogen makes more female plants.
- · Decrease the levels of potassium to make more female plants.
- · A higher nitrogen level and a lower potassium level for the first two weeks increases females.
- · Low temperatures increases the number of female plants.
- · High humidity increases the number of female plants.
- · Blue light increases the number of females. Red increases males.
- · Low moisture in the growing medium encourages males.
- · Fewer hours of daylight (e.g., 14 hours) increases the number of females. Longer days (e.g., 18 hours) make more male plants.
- · Any environmental stress tends to yield more male plants.
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