SYNOPSISThe aim of this trial was to investigate ways of improving the survival of Pinus patula seedlings when planted into areas characterised by high levels of harvesting residues (slash). The trial consisted of three non-randomised planting date treatments which spanned the 1997 -1998 summer planting season. On each of these dates, trees were planted into slash lines or areas where little or no slash had been left after harvesting. Sub-plot treatments tested whether the application of insecticide, fungicide or water combinations could improve the survival of P. patula seedlings.Within two of the planting dates tested, the presence of slash was found to significantly decrease the survival of Pinus patula. The relative magnitude of these differences varied between planting dates and diminished as the summer season ended. The impact of the sub-plot treatments was minimal in the cleared areas. In contrast, some of the sub-plot treatments, particularly the insecticide and fungicide combination treatment, improved survival in the slash to a level which equalled the best survival obtained in the cleared plots on each date.Water planting in the slash areas produced particularly poor survival at each planting date.
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