Brandon Hitchner wrote:... I don't understand, for example, cantaloupe, you don't want Nitrogen when the fruit sets
What
do you want?
Yes, I understand that when you want lots of green leafy growth, nitrogen helps that. I also understand that many plants will just keep producing green leaves instead of focusing on fruit.
But have you tried researching cantaloupe to find out what chemicals would help support fruit growth? I suspect water, heat and sunshine would be high on the plant's list. Does the plant need added "fertilizer" at all? Or would it benefit more from microbial friends? (Which can be introduced through using worm compost as they poop a lot of microbes, apparently.)
Douglas mentions phosphorus. Bones are high in phosphorus and we mostly char any bones from the kitchen in our wood stove and then add them directly to the soil, or to our compost. There's also a little bit of phosphorus in egg shells which we also dry, crush and add to our garden beds. However it can possibly affect pH due to other things in eggshells.
Sometimes I think "fertilizer" isn't as helpful as the publicity suggests. I've read that it really hurts the cooperation between soil micro-organisms and plants which normally do a lot of give and take, and fertilizer is like junk food that tastes great, but lacks the nutritional depth represented by micronutrients provided by healthy soil.