Outside nutrient inputs may be used, however manure is returned directly to the grassland as a major nutrient source.
aʊtsˈaɪd njˈuːtɹiənt ˈɪnpʊts mˈeɪ biː jˈuːzd, haʊˈɛvɚ mənjˈʊɹ ɪz ɹᵻtˈɜːnd dᵻɹˈɛktli tə ðə ɡɹˈæslənd æz ɐ mˈeɪdʒɚ njˈuːtɹiənt sˈoːɹs.