Pengaruh Konsentrasi Kulit Nanas Dan Daun Ketapang Terhadap Kualitas Pupuk Or…

This research aims to: 1) know the influence of the concentration of pineapple skins and leaves of ketapang on the quality of liquid organic fertilizer, 2) know the validity of booklets as a source of learning material biotechnology high school grade X. To such a goal has been carried out research in the Natural Laboratory PMIPA University of Riau. The study was conducted from November to June …