TY - BOOK AU - GATHUNGU KINGORI GEOFREY TI - OPTIMIZATION OF SEED POTATO TUBER PRODUCTIVITY AND QUALITY THROUGH INTEGRATED WATER ,NITROGEN AND PHOSPHORUS MANAGEMENT AV - THE SB 211 G 38 PY - 2014/// CY - CHUKA UNIVERSITY PB - GATHUNGU KINGORI GEOFREY KW - SEED POTATOES ER -