Re: How much fertilizer per mat for banana fruit?
What you're doing with pups is fine. Especially when you are establishing a new mat, you want a big healthy corm, and keeping the pups attached will achieve that. Repeatedly damaging the corm by removing pups only reduces the energy stored in the corm.
Now, there are good reasons why the standard commercial practice is to keep only one follower (pup) per mat, but keep in mind, those plants are generally being grown in the tropics (and so grow actively all year round); and the commercial goal is generally to maximize the finger size and bunch weight, not to maximize total fruit production per mat.
If your plant is in a good spot with full sun on all sides, I wouldn't worry too much about pup pruning until you've got a good vigorous mat with a big fat corm.
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