The very best organic soil amendment is compost from your own compost bin, if available. There are many kinds of organic fertilizers, from kelp and fish meal to earth worm castings and bat guano. Some organic fertilizers have high nitrogen levels and low amounts of phosphorus. Others are more balanced. Base your choice of fertilizers on the needs of the plants in your garden.
Organic gardeners use a variety of methods to control insect pests.
It is very important to learn to distinguish pests from beneficial insects. A good example of insect management using an organic method is a Japanese beetle trap placed upwind 50 to 100 feet from a garden. Other methods to control pests include floating row covers to protect young plants, releasing lacewings and mantids as predator insects, using repellent plants such as marigolds, and spraying fruit trees with dormant oils. The most effective controls for your garden will be determined by the types of pests, the plants being grown, and the season. Consult a reliable reference.