This book by Soma has a chapter on using nanner pollen for seeds. He calls it Age Feminization Technique (AFT) "After growing crop after crop of the same plants in the same conditions, I noticed that if I flowered the plants 10-14 days longer than usual, they developed male flowers. In AFT, plants are grown 10-14 days longer to induce male flowers".:
Organic Marijuana, Soma Style: The Pleasures of Cultivating Connoisseur Cannabis ( see chapter 10
The Soma Way of Female Seeds )
How to: RODELIZATION: SOMA'S WAY TO FEMALE SEEDS
