As for fertilizer I just finished an experiment

All trays had the exact same amount of seed (5.4 oz) same brand - same batch.
All were done in a commercial organic mix (Fafard)
(The mix has NO starter fertilizer)

Water was filtered

Heres what I did

1 - No fertilizer at all
2 - 1/2 rate Amozite
3 - 1/2 rate Kelp
4 - 1/2 rate Amozite and 1/2 rate Kelp
5 - 3/4 rate Amozite and 3/4 rate Kelp
6 - full rat Amozite and full rate Kelp

The results - virtually no difference in yield
Differences were 1 ounce of less per tray - which could be attributed to other factors - location on bench, amount of water. (Water was not measured - everything was bottom watered and some benches could have gotten slightly more water than others)

There was no visible difference in the trays - all had the same color green - all tasted the same.


As for the question "Was the juice from the ones with fertilizer more nutritious?" - I had no way of testing that.

My conclusions - Fertilizer makes no difference in yield - possibly because it is such a short term crop that the seed itself contained enough nutrients to get the plant to harvest.

For now I am using 1/2 rate Amozite and 1/2 rate kelp - mostly to hedge the bet on the nutrition value of the juice.