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Abstract
Results are presented of two experiments (field and glasshouse) comparing effects of nitrogen and phosphorus fertilisers on growth and nitrogen fixation of two white clover varieties, ‘Grasslands Huia’ and ‘Grasslands 4700’.
In both experiments, added N caused a temporary reduction in growth when available N supply was depleted, because of a short lag in the development of nitrogen fixation to replace this source.
At lower field temperatures (l4/4°c) 4700 grew better than Huia, but the performance of both varieties was similar in the glasshouse (21/12°c). In the field 4700, but not Huia, responded to added N during early establishment, indicating nitrogen fixation was limiting the growth of this variety. Without added N, growth of both varieties was similar.
Phosphate appeared to be more limiting in the glasshouse, and at low phosphate 4700 responded by producing relatively more root growth than Huia.