Ka hurihia te pākawa ota o roto i te oneone hei hauota rehu ki te kōhauhau. Ka kīia tēnei tukanga ko te 'tuku hauota', ā, mā te huakita tuku hauota tēnei tukanga e whakatutuki (RP 2009:209). / Nitrate in the soil is converted to nitrogen gas into the atmosphere. This process is called 'denitrification', and this process is completed by the denitrifying bacteria.

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