PENGGUNAAN ASAP CAIR TEMPURUNG KELAPA UNTUK MENURUNKAN KADAR TIMBAL (Pb) PADA BIJI KEDELAI (Glycine max) Utilization of Coconut Shell Liquid Smoke to Reduce Lead (Pb) Levels in Soybean Seeds (Glysine max) - Hartati, Sri (Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, 2015)