Fertilizer cost savings may indeed be done if we make our own fertilizer from organic materials. such as the use of organic waste around the home environment, even from household food scraps, can be used as fertilizer, such as being processed and fermented using EM4. I've read about articles about how easy it is to make organic fertilizer by utilizing organic waste. If this is successful, I believe that the cost savings for agriculture, especially in the application of fertilizers, will be maximized. but I'm not sure it can reach 90%. except for the use of fully homemade organic fertilizers.