Making organic fertilizer is an easy job, but it is difficult for those who have never tried it. This book is specifically arranged for environmentalists, observers and researchers, especially organic fertilizer researchers around the world. In this book, it clearly describes the advantages of organic fertilizers compared to organic fertilizers which have been widely produced and used by the community for a long time. this book is very suitable for academics, practitioners, students and students as study materials that have been described comprehensively. this book is the discovery of liquid organic fertilizer (Arenga palm), nutrient content and how to apply it to solid plants so that it can provide the best influence on plant growth and yield. this book is complemented by the thoughts of researchers at the national and international levels who have expertise in their respective fields so as to add scientific value to the contents of this book.