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Fertiliser Trials at Riverhead Forest
Authors: C.G.WestonPublication: New Zealand Journal of Forestry, Volume N.Z.J.For. 1954, Issue N.Z.J.For. 7(3) 1956, pp 35-46, Nov 1956
Publisher: New Zealand Institute of Forestry
Abstract: Forest establishment was begun in 1926 on hilly, scrub-covered country that had once carried kauri forest. The soils are largely infertile, poor-structured clays, deeply weathered and partly eroded. Symptoms of ill-health have since occurred in a significant proportion of the plantations. Good responses to heavy dressings of phosphate have recently been obtained in the older unthrifty areas of Pinus radiata which show some similarities to disordered stands in Australia, but zinc has not yet been effective. Other elements are being tried experimentally, and the results of more economical dressings of superphosphate, applied in small trials and also from aircraft on a semi-practical scale, are awaited