Zands if I get you correctly, the next new moon is January 14, 2013. The next 14 days will put you to January 28, with the best day being January 21, 2013?
I did dome grafting on December 18 Waxing moon and they are already pushing out like crazy.
Estimado Carlos, you have more than one day. Let us say the four days surrounding January 21. The idea is increasing light and tidal pull on all water and all plant juices from the moon. This starts right after the new moon which is empty and non-visible.
http://www.plantea.com/planting-moon-phases.htm
Increasing Light -- New moon to full moon
Examples of garden chores to do by the light of the moon:
(NOTE: These are general guidelines. I highly recommend referring to Ed Hume's Planting Guide for specific planting tasks):
Repot and groom houseplants
Sow seeds of plants that grow above ground (for helpful tips on starting your own seeds, click here.)
Fertilize
Graft fruit trees
Plant evergreen and deciduous trees
Zands, those 'tidal' influences happen every single day, 365 days a year - as the Earth rotates once per 24 hours, under the moon above, so to speak. So the plant juices and such are going to feel daily tidal pulls similar to the oceans.
The phases have to do with where the moon is in its orbit around the Earth. If it's on the other side of Earth from the sun then we see it 'full'. If it's off to the side - ahead or behind us - we get to see 'half' of it. If it's on the sun side of us then the face of the moon to us is dark.
It is true though that the COMBINED effects of tidal pull with moon brightness is at a maximum once a month. And, as you say, there are several days (nights) bracketing full moon when the moonlight is close to'full'.