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Differential fertilisation of pine plantations on acid forest soils



Differential fertilisation of pine plantations on acid forest soils



South African Forestry Journal (147): 16-25



An approach to mapping plantation sites for fertilization at different rates is discussed and compared with the generally accepted recommendations of 35 kg per hectare P. Fertilization of sites in the Tsitsikamma Key Area [South Africa] with a rooting depth of 500 mm or greater resulted in a saving of potentially misapplied phosphate of 24%. Fertilizing based on a regression model for increasing the soil Bray 2 levels to 12 mg/kg resulted in a further potential saving of 46% based on a map of predicted rates computed from soil characteristics using a mean rate of 18.9 kg/ha P. Variables studied showed spatial dependence and so we recommend the use of geostatistics in survey planning and mapping as this allows more efficient use to be made of spatial data. Results from this paper show promise for improving the forestry manager's flexibility and aiding his decision-making.

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Accession: 002072661

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DOI: 10.1080/00382167.1988.9628966


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