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Evaluation of soils, landforms and potential tree performance. Plantagenet Locs 1425 and 1511

Harper, R.J.ORCID: 0000-0003-0268-2917 (1991) Evaluation of soils, landforms and potential tree performance. Plantagenet Locs 1425 and 1511. Department of Conservation and Land Management

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The soils and landforms of a 195 ha farming property, comprised of CG 1425 and CG 1511, 6 km south of Mt Barker, were examined and estimates made of their suitability for plantation establishment.

The property comprises the crest and upper slopes of a broad interfluve, and three Soil Associations based on different land elements were identified. Soil Association A comprises the soils of the gently undulating, deeply weathered upland, Soil Association B the soils of upland swamps and concavities, and Soil Association C the deep sandy soils which occur on sand dunes and sheets. Soils were mapped on the basis of factors likely to be of importance for the establishment, survival and performance of trees such as depth of root penetrable horizons, the occurrence and nature of impenetrable layers and likely soil water relations. Seven soils were identified, within these Associations, and these varied in their silvicultural potential. Only one soil, Soil A1, with areas of 33 ha and 26 ha, in locations 1425 and 1511 respectively, is considered to be immediately suitable for the establishment of plantations. Soils such as A2, S1 and S3 have root impenetrable pans which will require ripping to depths of up to 100 cm. These soils, Soil A3, and parts of D1 and D2 are also affected by waterlogging which will most likely limit the survival and growth of a range of tree species. All soils have sandy surface horizons, which are likely to be relatively infertile. While farming has improved the fertility of shallower soils, such as Soil A1, nutrient deficiencies in soils with deeper sandy horizons will limit growth. Each limitation can be remedied, however these remedies should be carefully costed to determine their economic viability.

Although trees can undoubtedly be established on each location, the combination of root impenetrable pans, waterlogging and deep sand mean that the prospects of future growth on all soils, apart from Soil A1, can be considered economically marginal. Brief notes are made of the suitability of the site for the establishment of a wood pulp-mill.

Item Type: Report
Series Name: Internal Report. Department of Conservation and Land Management
Publisher: Department of Conservation and Land Management
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