Wow, inkcube - thank you for the technical detail.
Yes, my citrus and other non-musa fruits do well on 30 gallons / week because they are trained semi-dwarfs and also because of a low evapotranspiration rate. The minimum of 25-30 mm/week for bananas you mentioned works out to about 40-50 gallons/week. I will try that range on bananas here.
As for nutrients, your numbers indicate that an (N, P, K) of (1.0, 0.05, 1.5) pounds per year per plant would be sufficient, and any additional P would be largely ignored. I can easily mix a few granulars to produce an 8-0.5-12 % by weight fertilizer. One cup per month per musa of this would then produce the desired total.
Thanks again, this is just the kind of cultivation data I've been hunting for!
