This fallow period is shortened if population density grows, requiring the input of nutrients (fertilizer or manure) and some manual pest control.
ðɪs fˈæloʊ pˈiəɹɪəd ɪz ʃˈɔːɹʔn̩d ɪf pˌɑːpjʊlˈeɪʃən dˈɛnsᵻɾi ɡɹˈoʊz, ɹᵻkwˈaɪɚɹɪŋ ðɪ ˈɪnpʊt ʌv njˈuːtɹiənts fˈɜːɾəlˌaɪzɚ ɔːɹ mənjˈʊɹ ænd sˌʌm mˈænjuːəl pˈɛst kəntɹˈoʊl.