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A full size banana will need a full pound of N and a pound and a half of K in a yr--your SDS will not need that much, but just to show you how much typical organic fertilizer that is, if the N-P-K ratio is a typical number like 3-1-1, you would need 33 pounds just to supply the N, 6 pounds to supply the P and a whopping 150 pounds to supply the K.

With banana fuel, you would need just 5 to 6 pounds per yr. Your SDS would need just 2-3 pounds, even the if it were in ground.

Another thing you should understand, is that in a container, you should fertilize more acording to the size of the container than the size of the plant.

The danger of chemical fertilizer is that you can "burn" the plant--put more fertilizer on than the plant can tolerate. That cannot happen with organic fertilizers, but as you can see, it takes a lot more. The really safe way for beginners to use fertilizer is to use water soluble fertilizers that you mix with water (according to directions) and use for watering.