Shifting cultivation (or slash and burn) is a system in which forests are burnt, releasing nutrients to support cultivation of annual and then perennial crops for a period of several years.
ʃˈɪftɪŋ kˌʌltɪvˈeɪʃən ɔːɹ slˈæʃ ænd bˈɜːn ɪz ɐ sˈɪstəm ɪnwˌɪtʃ fˈɔːɹɪsts ɑːɹ bˈɜːnt, ɹᵻlˈiːsɪŋ njˈuːtɹiənts tə səpˈoːɹt kˌʌltɪvˈeɪʃən ʌv ˈænjuːəl ænd ðˈɛn pəɹˈɛnɪəl kɹˈɑːps fɚɹə pˈiəɹɪəd ʌv sˈɛvɹəl jˈɪɹz.