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New Zealand Journal of Forestry (1985) 30(1): 115–120
©New Zealand Institute of Forestry

Research article
The cost/benefit of using hexazinone for selective grass control in radiata pine in Canterbury.

B. P. Glass

A silvicultural stand model was used to compare net sawlog break-even stumpages of three post-planting grass weed control treatments: (1) no spraying, (2) spot spraying, and (3) aerial broadcast spraying, at a spray rate of 2 kg/ha hexazinone, for Pinus radiata (D. Don) over one rotation in Canterbury. For each spray treatment an untended (Site Index 24 m) and a tended (Site Index 29 m) regime were evaluated. For both regimes spot spraying was the most economic, and aerial spraying was the least economic, post-planting grass control treatment. The break-even stumpage for spot spraying was also least sensitive to changes in the early growth gain achieved by grass control, and also to the effects of possible follow-up spraying.
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