III. Gisborne Plains, Manutuke

Abstract
N fixation rates were low at all times, with very low rates in some months probably because of low rainfall and dry soils. As soil moisture decreased, relatively more fixation occurred below 75 mm. Estimates of annual total N fixed were 92 and 122 kg/ha for 1974–75 and 1975–76 respectively. High levels of available N must be present to support the high levels of pasture production (14.1 t DM/ha and 15.2 t DM/ha for the two trial years).

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