I. Introduction and general methods

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Abstract
Historically, after successful establishment of pasture on forest soils after burning, reversion to low quality swards occurred as fertility declined. This decline in pasture quality could be averted by correction of nutrient deficiencies and introduction of clovers, which were shown to fix large quantities of atmospheric N. Little subsequent work has examined the role of clover in the N cycle of high fertility pasture. The relevant literature is briefly reviewed and trials are introduced in which N fixation rates and associated pasture parameters were measured at nine sites throughout New Zealand.