Daniel, R.M., Steele, K.W. & Limmer, A.W. (1980). Denitrification by rhizobia: A possible factor contributing to nitrogen losses from soils. New Zealand Agricultural Science, 14(3), 109-112.
Permanent Research Commons link: http://hdl.handle.net/10289/4837
The intensive pastoral farming system on which New Zealand animal production is based is almost completely dependent upon the rhizobium-legurne symbiosis for the fixed nitrogen required for pasture production. The average annual fixation has been measured as 184 kg nitrogen/ha in developed lowland pastures Hoglund et cii., 1979 and about 13 kg nitrogen/ha in poorly developed bill country pastures (Grant and Lambert, 1979). From these figures it can be estimated that rhizobia in New Zealand pastures fix in excess of one million tonnes of nitrogen an nually. The current annual application of fertilizer nitrogen to pastures is about 12 500 tonnes (O'Connor, 1979).
The New Zealand Institute of Agricultural & Horticultural Science
This article has been published in the Journal: New Zealand Agricultural Science. Used with permission.