Phosphate Fertilisation of Mature<i>Pinus radiata</i>Stands

Payn, T. W.; Ronde, C. de; Grey, D. C.

doi:10.1080/00382167.1988.9628967

Cited by 7 publications

(5 citation statements)

References 3 publications

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“…In a P. radiata saw-timber stand in the south-western Cape, South Africa, the IRR calculated 10 years after NP fertiliser application at age 15 years was 19% (Donald, 1987). Payn et al (1988) performed economic analyses on two P. radiata saw-timber trials in the southern Cape. In the first trial, the significant volume increase in response to P applied to a 17.5-year-old stand was not economical six years after fertilisation, whereas in the second trial, IRR values calculated 10 years after fertilisation at age 21 ranged from 26 to 58%, depending on the level of P applied (Payn et al, 1988).…”

Section: Economic Returnsmentioning

confidence: 99%

“…Payn et al (1988) performed economic analyses on two P. radiata saw-timber trials in the southern Cape. In the first trial, the significant volume increase in response to P applied to a 17.5-year-old stand was not economical six years after fertilisation, whereas in the second trial, IRR values calculated 10 years after fertilisation at age 21 ranged from 26 to 58%, depending on the level of P applied (Payn et al, 1988). Wells and Allen (1985) suggested that as prescription technology for fertilising stands is more finely tuned, the risks associated with fertiliser application will be reduced and financial returns will become even more attractive.…”

Section: Economic Returnsmentioning

confidence: 99%

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The effects of mid- and late-rotation fertiliser application on tree growth and wood quality in softwood saw-timber stands: a critical review

Campion¹

2008

Southern Forests: a Journal of Forest Science

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To cite this article: JM Campion (2008) The effects of mid-and late-rotation fertiliser application on tree growth and wood quality in softwood saw-timber stands: a critical reviewThe economic benefits of mid-and late-rotation fertiliser application in saw-timber stands are well documented. These benefits are significantly related to a reduction in the length of the compound interest period over which the investment in fertiliser is carried, compared to fertilising at planting, and also to the additional volume produced by fertilisation, which is laid down as clear, high-quality mature wood. Various criteria are used to identify biologically responsive sites and stands that will provide an economic response to fertilisation; these include soil diagnosis and foliar nutrient analysis, site index, initial basal area and stocking levels, and leaf area index (LAI). While it appears that the accuracy of identifying biologically responsive sites is likely to be improved by using a combination of diagnostic criteria, quantifying the difference between a stand's current LAI and its maximum potential LAI have enabled researchers in the USA to estimate response to fertilisation, as well as the appropriate timing, elements and rates of application. Fertilisation needs to be considered in relation to other silvicultural operations such as pruning, thinning, prescribed burning and herbicide application (weed control). The application of fertiliser after thinning may shorten the time taken to achieve pre-thinning LAI and regain maximum volume production.

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Section: Economic Returnsmentioning

confidence: 99%

Section: Economic Returnsmentioning

confidence: 99%

The effects of mid- and late-rotation fertiliser application on tree growth and wood quality in softwood saw-timber stands: a critical review

Campion¹

2008

Southern Forests: a Journal of Forest Science

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“…Levels of fertiliser applied at planting are 35 kg/ha on soils with adequate (>700 mm) rainfall and an effective rooting depth of over 400 mm. Levels prescribed for mature trees are 35 kg/ha P on soils of 400 to 600mm depth and 60 kg/ha on soils of over 600 mm depth (Payn, De Ronde and Grey, 1988). Results from the field trials upon which these recommendations are based, have taken no account of existing soil phosphate levels and buffering character and are therefore rather general.…”

Section: Introductionmentioning

confidence: 98%

Differential Fertilisation of Pine Plantations on Acid Forest Soils

Payn¹,

Clough²

1988

South African Forestry Journal

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SYNOPSISAn approach to mapping plantat~on sites for fertilisation at different rates is discussed and compared with the g~nerally a~cepted recommendations of 35 kg per hectare P. Fertilisation of sites in the Tsitsikamma Key Area with a~~~tlng depth of 500 mm or greater resulted in a saving of potentially misapplied phosphate of 24 %.Fert~hsmg ?ased 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~map of predicted rates computed from soil characteristics using a mean r~te.of 18,9 kg/ha P: Vanables studied showed spatial dependence and so we recommend the use of geostatistlc.s III survey planmng 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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“…Pine plantations growing in warm climates commonly respond to applications of N, and often, the responses are maximal when combined with P and/or additional nutrients (Donald et al 1987;Payn et al 1988;Vose and Allen 1988;Turner et al 1996;Fife and Nambiar 1997;Carlson and Soko 2000;Campion and du Toit 2003;Albaugh et al 2004;Fox et al 2007). However, not all stands respond with significant growth improvements when fertilised, as other resources may be limiting growth, or alternatively, growth may already be close to optimum rates obtainable under ambient climatic conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The possibility of implementing the SNAP model or other estimates of N availability as fertilisation decision support in the softwood plantations of South Africa has yet to be investigated. On the southern seaboard of South Africa, most stands respond to added P (Payn et al 1988;De Ronde 1992); however, some sites may respond to additional N in the presence of P (Donald et al 1987;Chikumbu 2011). Significant advances can thus be made in forest fertilisation in these regions if the need for added fertiliser N is better understood.…”

Section: Introductionmentioning

confidence: 99%

Modelling soil nitrogen mineralisation in semi-mature pine stands of South Africa to identify nutritional limitations and to predict potential responses to fertilisation

Toit

Scheepers

2020

Annals of Forest Science

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& Key Message Estimates of available nitrogen (based on topsoil nitrogen mineralisation rates) in semi-mature stands of Pinus radiata (D Don.) as well as pure species and hybrids of Pinus elliottii (Engelm.) in South Africa display a strong, significant, negative relationship with growth response to applied fertilisers in field experiments. This inexpensive technique can be incorporated in a fertiliser decision support system to minimise wasteful fertiliser applications. & Context South African mid-rotation pine stands respond with high variability to nitrogen fertiliser supplements in the presence of phosphorus. & Aims We aimed to find a screening tool for stands that are responsive to fertilisation. & Methods The volume growth response relative to control plots (3 years after fertilisation with 200 kg ha −1 N in the presence of 100 kg ha −1 P) was determined across 14 pine fertiliser experiments in South Africa. These values were correlated to soil and other properties for each site and also to estimates of N availability and N mineralisation rates using the Soil Nitrogen Availability Predictor (SNAP) model. & Results The relative volume growth response to fertilisation ranged with a factor from 0.05 to 0.96. No single result from standard soil analyses showed a strong positive or negative correlation with this growth response. However, highly significant negative correlations were observed between an estimate of N availability based on topsoil aerobic nitrogen mineralisation rates and the relative volume growth responses to fertilisation. & Conclusion The estimate of N availability derived from incubation studies may assist us to predict the magnitude of the response to N fertilisation (in the presence of P) with a fair degree of accuracy. The accuracy can be improved if the N availability estimate from aerobic incubation is used with other variables (pH and soil C content) in a multivariate regression to predict relative yield response to fertilisation.

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Phosphate Fertilisation of MaturePinus radiataStands

Cited by 7 publications

References 3 publications

The effects of mid- and late-rotation fertiliser application on tree growth and wood quality in softwood saw-timber stands: a critical review

The effects of mid- and late-rotation fertiliser application on tree growth and wood quality in softwood saw-timber stands: a critical review

Differential Fertilisation of Pine Plantations on Acid Forest Soils

Modelling soil nitrogen mineralisation in semi-mature pine stands of South Africa to identify nutritional limitations and to predict potential responses to fertilisation

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