Most agricultural societies discove

Most agricultural societies discovered the slash and burn technique.
First, all the foliage in a section of a forest was cut down, creating a field.
The remains were left on the ground.
Then the field was set on fire, and the ash from the cut foliage enriched the soil.
After many uses even this enriched soil became barren, and farmers were forced to find new fields.

Hasil (Bahasa Indonesia) 2:

Sebagian besar masyarakat pertanian menemukan slash dan teknik membakar.
Pertama, semua dedaunan di bagian hutan yang ditebang, menciptakan lapangan.
Sisa-sisa yang tersisa di tanah.
Kemudian lapangan dibakar, dan abu dari potong daun diperkaya tanah.
Setelah banyak menggunakan bahkan memperkaya tanah ini menjadi tandus, dan petani dipaksa untuk menemukan bidang baru.