Sistem bera ( ) adalah suatu sistempengembalian kesuburan tanah dengan caramembiarkan tanah tanpa ditanami. Hampirsemua s i s tem per tanian t radi s ionalmempraktekkan sistem bera. Sistemperladangan berpindah adalah suatu bentuksistem bera, di mana sesudah hutan dibuka,lahan ditanami dengan tanaman pangan selama1-3 musim tanam dan sesudah kesuburan tanahmenurun dan/atau gulma sulit diatasi, lahandiberakan selama 5 sampai 15 tahun, laludibersihkan kembali dengan sistem tebas dandigunakan untuk 1-3 musim tanaman pangan.
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