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New Zealand Journal of Forestry (1972) 17(1): 101–107
©New Zealand Institute of Forestry

Research article
Response of thirty- forty-year-old retarded radiata pine stands in Northland to aerial appilcation of phosphate

J.G. Rawson

Yield plot data show that improved growth of retarded radiata pine (Pinus radiata D.Don), thirty to forty years old, on a phosphate-deficient Northland site, was obtained by aerial topdressing with superphosphate at rates of between 0.9 and 1.6 tonnes per hectare. Applications varied from a single heavy dressing to several light ones, one to three or more years apart. Increases in diameter growth rate exceeding 500% have been recorded, and mean annual increment has shown a sharp upward trend, approaching in some cases the m.a.i. expected for thrifty stands on good sites.
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