The type of fertilizers that I am talking about are manures (cow and poultry), worm castings, and fish fertilizer. I have done a series on my YouTube channel (aandbfarm) about how well our worm castings work. I have found that worm castings increased the growth rate of our vegetables exponentially about 3 times faster than the normal growth rate. As a kid, my family would use poultry manure in our garden to help fertilize our garden. Our veggies would grow quicker and faster. One important thing to know about poultry manure is that it needs to be put in the sun to help kill any bacteria that is in it before applying it to your garden. And finally fish fertilizer. I have used fish fertilizer a few times and I would rate it up there with the worm castings. I have seen about the same rate of growth as worm castings. The only downfall to fish fertilizer is that it's very smelly.
In conclusion, there are more ways to fertilize your garden than just using 10-10-10 or MiracleGro. By using organic elements like fish manure (fertilizer), worm castings, and poultry manure are ways to fertilize your garden naturally. Plus they are a healthy alternative to fertilizing and are organic. So go out there and give it a try and see for yourself.
Happy Gardening.