na INLIS000000000000579 20220614104023 0010-052200000000269 220614 g 1 ind KESUBURAN Tanah / M. Yusuf Nyakpa Nyakpa M. Yusuf Lampung : Unila, 1988 "xii, 258 p. : ills. ; 20 cm" 631.4 SOIL FERTILITY. 1 631.4 631.4 NYA k 1417