This experiment might well be worth your while if you, like me, are curious to see how much truth biodynamic farming holds:
http://www.considera.org/2013planting.html
These days are mostly specifically BAD days to plant: perigees, Mercury nodes, eclipses, etc. If the biodynamic calendar is accurate, you
should be able to verify results by intentionally planting during some of these days.
Here is what Maria Thun claims happened when she planted on Mercury node days:
http://books.google.cz/books?id=PR9zw4ukqv4C&pg=PA40&lpg=PP1&dq=biodynamic&hl=cs [pg 40]
Even if you don't participate directly in this, some of you might be interested in the results.