The Application of Fertilisers to Pines in Southern Africa

Donald, D. G.M.; Lange, P. W.; Schutz, C. J.; Morris, A. R.

doi:10.1080/00382167.1987.9630261

Cited by 16 publications

(9 citation statements)

References 2 publications

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“…Seedling growth. Although there is contradictory information regarding the effects of fertilization at establishment of fast-growing conifers (Wollons and Snowdon 1981, Ballard 1984, Donald et al 1987, Gerding et al 1987, large cumulative growth responses to weed control and fertilization have been reported in radiata pine (Nambiar 1984b, Gerding et al 1987, Mason and Milne 1999. Nutritional demands in young plantations are usually low compared to site nutrient availability after harvesting (Allen et al 1990, Smethurst andNambiar 1990), reducing early responses to fertilization (Smethurst and Nambiar 1990, Fife and Nambiar 1997, Allen et al 2001.…”

Section: Discussionmentioning

confidence: 99%

Early response of Pinus radiata plantations to weed control and fertilization on metamorphic soils of the Coastal Range, Maule Region, Chile

Rubilar¹,

Blevins²,

Toro³

et al. 2008

Bosque (Valdivia)

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Management of Pinus radiata plantations in Chile has been intensified in the last decades using site preparation, weed control and fertilization. The lack of information on site-specific responses imposes uncertainty about the biological and economic benefits of these techniques. Early projection of initial tree growth response to intensive culture is extremely important but difficult to estimate unless a clear understanding of limiting resources exists at each site. Based on the three-year development of a weed control and fertilization trial located on metamorphic soils of the Coastal Range of Chile we investigated the site specific limitations at these sites. Fertilization treatments included no fertilization (F0) and fertilized (F1) (26g N + 16.7g K + 2.5g B per plant). Banded weed control treatments on woody vegetation included one (WC1) and two consecutive years (WC2) of release. After 12 months, seedling survival was significantly increased by weed control but not by fertilization. Three years after establishment, weed control increased survival by 13%, and intensive silvicultural treatment gains were 56-103% for root collar diameter (RCD), 53-82% for height (HT), 269-591% for volume index (V=D 2 H), and 35-77% for crown diameter (CR). Lack of fertilization response suggested that water was the most limiting resource. Weed control responses represented almost one growing season gain in tree growth. No additional gains were obtained by weed control of woody vegetation during the second growing season. A linear relationship was found between log(CR) and log(V), suggesting a simplified method to estimate tree vigor at early stages of plantation development.

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Section: Discussionmentioning

confidence: 99%

Early response of Pinus radiata plantations to weed control and fertilization on metamorphic soils of the Coastal Range, Maule Region, Chile

Rubilar¹,

Blevins²,

Toro³

et al. 2008

Bosque (Valdivia)

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“…Shortages of micro-elements have been reported to affect growth severely . Local fertiliser experiments have shown a widespread response to superphosphate and isolated occurrences of manganese deficiency (Donald et al, 1984;Grey, 1988).…”

Section: Soil Nutrientsmentioning

confidence: 99%

Site Requirements ofPinus radiata: A Review

Grey

1989

South African Forestry Journal

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“…Clearfelled stands which were severely infested may have over 2 m of Gleichenia debris on the soil surface, rendering any form of site preparation virtually impossible. The application of phosphate fertilisers which has recently become accepted management practice in the S Cape should significantly reduce the Gleichenia problem (Donald et al, 1984).…”

Section: Western and Southern Capementioning

confidence: 99%

Cleaning Operations in South African Forestry

Donald

1986

South African Forestry Journal

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SYNOPSISIntense weed control is practised during establishment and re-establishment; cleaning to improve access during the stand's life is done, but has had little effect on the build up of weed populations in South African plantations.The cost of weed control has increased some ten-fold while the efficiency of the cleaning operation has, if anything, improved since the last survey in the late sixties.The use of herbicides has increased significantly since the last survey and appears likely to increase further in the future. Herbicides are more effective than slashing, which stimulates growth in some weed species. Extension work must be increased if current herbicide knowledge is to be effectively utilised.Research to quantify the effect of weed infestation in commercial stands and to examine the possibility of grazing animals controlled by electric fencing to overcome the problem should be given priority.

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The Application of Fertilisers to Pines in Southern Africa

Cited by 16 publications

References 2 publications

Early response of Pinus radiata plantations to weed control and fertilization on metamorphic soils of the Coastal Range, Maule Region, Chile

Early response of Pinus radiata plantations to weed control and fertilization on metamorphic soils of the Coastal Range, Maule Region, Chile

Site Requirements ofPinus radiata: A Review

Cleaning Operations in South African Forestry

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