The Elven Sacred Tree Is in My Backyard

A fantasy world of swords and magic, where magic is gradually fading and civilization remains at a medieval level. Natural resources are abundant, but farming methods and living standards are relatively primitive. Humans, elves, orcs, dwarves, and many other races live there, divided by mistrust and even open conflict. The protagonist uses scientific thinking to tackle agricultural problems in a magical world, beats magical wheat fields with hybrid rice, and teaches the pests of the demon realm a lesson with pesticides. Farming is more than a means of survival: it is central to reviving a mysterious ancient tree and bringing different races together.