“The Influence Of Various Dosages of Compost Solid Plus (Kosplus) On Improving The Soil Chemistry Ultisol In Kabupaten Kuantan Singingi”. 2017. Jurnal Agroqua: Media Informasi Agronomi Dan Budidaya Perairan 15 (1): 8-19. https://journals.unihaz.ac.id/index.php/agroqua/article/view/76.