How to increase tef (Eragrostis tef (Zucc) Trotter) productivity?

I declare that this book is my original work and that all sources of materials used for the book have been duly acknowledged. The book is consisting of 59 pages and it complied with abstract, introduction, literature review, materials & methods, and Summary & conclusion. Beside well justification and logical expirations, the book has answer about the appropriate planting method and the right time of DAP fertilizer application.