Your organic fertilizer will remove the hardness of the soil and improve its overall condition. The soil will be able to hold both water and nutrients much better after fertilizing it. In addition, organic fertilizer buffers the soil so it is more stable to extremes of acidity or alkalinity. In many cases, the microbiology of the soil improves and the added nutrients will gradually release themselves as the plants grow.
Organic plant fertilizer will add healthy nitrogen to the soil in a process called “nitrification”. Nitrogen is a necessary nutrient for the growth of most gardens—even conventional ones. Compost piles help organic gardens by improving the usable nitrogen component of the soil.