The final trial tested BioGrow Endo Plus. Mykos, and Epsoma Bio-Tone Starter Plus.
The trial ran for 14 days. There was little difference in above ground plant growth with all of the Mycorrhizaes. The control lagged a little and was a little smaller. The Epsoma Bio-Tone Starter Plus plant was a little bigger and greener (it has natural fertilizers in it too). Root growth on all of the Mycorrhizae trials was very similar and were significantly larger than the control. The Epsoma Bio-Tone Starter plus had longer roots but a slightly smaller mass.
The light deprived plant didn't show much change. The leaves and roots were smaller, the stem was significantly thinner, and it grew much slower than control.
Final decision for me. Use Mycorrhizae (I'm going to use both Epsoma Bio-Tone Starter Plus and BioGrow Endo Plus) and don't stress plant with light deprivation.
Good Luck!
I started growing Atlantic Giant Pumpkins in 2010. They are so amazing to grow that I have spent several hundred hours reading everything I can find to help me to be successful. I grew 2 plants, one of which produced an 1180 lb pumpkin that took second place at the 2010 Circleville Pumpkin Show weigh off. Several people I work with have shown interest in growing a Giant Pumpkin, so I created this document for beginners that want to grow a huge pumpkin, competitively or not.
Welcome! I hope you find the information helpful to grow your own Atlantic Giant Pumpkin.