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The cost benefit of using hexazinone for selective grass control in radiata pine pinus radiata in canterbury new zealand



The cost benefit of using hexazinone for selective grass control in radiata pine pinus radiata in canterbury new zealand



New Zealand Journal of Forestry 30(1): 115-120



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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