December 2018 1 28 Report
Pernyataan:
(1) membuat sengkedan
(2) mengadakan pergiliran tanaman
(3) melakukan tumpang sari
(4) memberi pupuk
Upaya menjaga kesuburan tanah secara biologis terdapat pada angka....
A. (1)dan(2)
B. (1)dan(3)
C. (2)dan(3)
D. (2)dan(4)
E. (3)dan(4)
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