My husband became quite literally obsessed with the Jadam method so I finally bought him the physical book. Arrived much sooner than expected from Korea and the knowledge is priceless. There are also videos online outlining the process and it's truly revolutionary. We plan to implement these practices on our farm this year. I would recommend this to anyone trying to farm because chemical farming is killing America's land, just go on google earth and take a look around the Great Plains. We need to restore this planet and Jadam will 100% get us there. Better than any other method and the science just makes sense. $100/acre/year.. That's hard to beat. Buy this book!!