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Factors Affecting Soil Phosphate Distribution and Reactions in Cape Forest Soils
Item type: Journal Article • Journal: South African Forestry Journal • Authors: T.W. Payn --- Saasveld Forestry Research Centre, M.E. Clough --- Saasveld Forestry Research Centre,The amounts of various forms of phosphate in some Cape soils and the adsorption of phosphate by these soils were investigated. The levels were low and only 2% was in available form. The major fraction of phosphate in the soil... -
Long term nitrogen and phosphorus application to veld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: C.H. Donaldson --- , G. Rootman --- , D. Grossman --- Department of Agriculture,The long term effects of a 5N x 3P factorial fertilizer application trial on hay yields, botanical composition and soil properties of veld are presented. Significant increases in hay yields were recorded during most years. There was a strong correlation... -
Fertilization of southern tall grassveld of natal: Effects on botanical composition and utilization under grazing
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.R. Barnes --- Department of Grassland Science, D.I. Bransby --- Department of Grassland Science, N.M. Tainton --- Department of Grassland Science,The long‐term effects of nitrogen, phosphate and lime on change in botanical composition and utilization under grazing of Southern Tall Grassveld of Natal are presented. Nitrogen, phosphate, lime and type of nitrogen affected botanical composition significantly. Generally, fertilization had the... -
Habitat preferences of twenty‐three grass species in the Bankenveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: F.P. Jordaan --- Department of Agricultural Development, Highveld Region, Republic of South Africa A.S. de Beer --- Department of Agricultural Development, Highveld Region, Republic of South AfricaSome grass species occur more frequently in certain habitats than in others. There is, however, uncertainty as to exactly which factors are responsible for this phenomenon. Species composition as well as habitat data were collected from plots situated on the... -
Response of subterranean clover to liming and phosphate fertilization on a low potassium soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Wooldridge --- , Republic of South Africa R.E. Harris --- , Republic of South AfricaSeveral Trifolium varieties grown in an acid Bokkeveld shale soil responded positively to small additions of lime and P. Growth was probably limited by a K deficiency, and it is unlikely that Trifolium species could be successfully grown as cover... -
The influence of different P, NH+ 4 and NO− 3 supply levels on the yield and P and Ca relationships in wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.S. Claassens --- Department Soil Science and Plant Nutrition, Republic of South Africa W.J. Fölscher --- Department Soil Science and Plant Nutrition, Republic of South AfricaIn a water culture experiment with wheat, the influence on growth and nutrient uptake of varying the P supply from 0,02 to 5 mmol H2PO4 − dm−3 and the NH4 +:NO3 − ratio from 0:15 to 12:3, with a Hoagland... -
The effectiveness of Langebaan rock phosphate and superphosphate in two acid, phosphate-deficient soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.R. Thibaud --- Summer Grain Sub-Centre, Republic of South Africa M. P.W. Farina --- Summer Grain Sub-Centre, Republic of South Africa J.C. Hughes --- Summer Grain Sub-Centre, Republic of South Africa M.A. Johnston --- Summer Grain Sub-Centre, Republic of South AfricaAcid, P-deficient soils with a large capacity to immobilize P favour the rapid decomposition of apatite. Such soils are widespread in the east of South Africa and the possibility exists that Langebaan rock phosphate (Langfos) may be a more cost-effective... -
Maize response to Langebaan rock phosphate—superphosphate mixtures under glasshouse conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.R. Thibaud --- Summer Grain Sub-Centre, Republic of South Africa M. P.W. Farina --- Summer Grain Sub-Centre, Republic of South Africa J.C. Hughes --- Department of Agronomy, Republic of South Africa M.A. Johnston --- Department of Agronomy, Republic of South AfricaA previous investigation showed that Langebaan rock phosphate (Langfos) was not an effective substitute for superphosphate. However, in the light of reports that P availability is enhanced when phosphate rock (PR) and monocalcium phosphate are combined, an improvement in Langfos... -
Assessment of phosphorus availability in soils fertilized with Langebaan rock phosphate or superphosphate
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.R. Thibaud --- , Republic of South Africa M. P.W. Farina --- , Republic of South Africa J.C. Hughes --- Department of Agronomy, Republic of South Africa M.A. Johnston --- Department of Agronomy, Republic of South AfricaProblems currently exist in the interpretation of soil test values for soils fertilized with rock phosphate. This study was undertaken to compare the ability of four extradants (Ambic, Bray 1, Mehlich 3 and modified Truog) to assess plant available phosphorus... -
Response of maize to ammonium nitrate, urea and cogranulated urea-urea phosphate
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O.A. Yerokun --- Department of Soil Science, ZambiaUrea fertilizers may lose N by ammonia volatilization when applied in the field. In order to reduce this loss, modified urea compounds are being used. Not all of them reduce ammonia loss and improve crop yields. A field study was... -
Ammonia volatilization from ammonium nitrate, urea and urea phosphate fertilizers applied to alkaline soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O.A. Yerokun --- Department of Soil Science, ZambiaThe volatilization of ammonia following applications of urea fertilizers to soils may release significant amounts of N into the atmosphere and reduce the plant available N. This study compared ammonia loss from urea phosphate (170 g N kg−1, 190 g... -
Rind texture and juice acid content of Citrus spp. as affected by foliar sprays of mono-potassium phosphate (MKP), urea ammonium phosphate (UAP) and mono-ammonium phosphate (MAP)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: F.N. Mudau --- Department of Plant Production, Republic of South Africa K.I. Theron --- Department of Horticultural Science, Republic of South Africa E. Rabe --- Department of Horticultural Science, Republic of South AfricaRind coarseness of fruit of Citrus spp. is a general problem in the Citrusdal region of South Africa (Western Cape Province), often limiting the percentage of exportable fruit. Acid content of the juice of Citrus fruit is an important determinant... -
THE INFLUENCE OF P-RETENTION BY SOILS AND SEDIMENTS ON THE WATER QUALITY OF THE LIONS RIVER
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: H.D. Furness C.M. BreenThe soils of Midmar dam catchment and the sediments of the Lions river are shown to have high P-retention properties. Present conditions result in little leaching of PO4 −4 from the soils and favour a net transport of P from... -
EFFECT OF PHOSPHATE CONCENTRATION ON THE FINE STRUCTURE OF THE CYANOBACTERIUM, MICROCYSTIS AERUGINOSA KÜTZ. EMEND. ELENKIN
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: DerylJ. Barlow --- , South Africa W. L.J. van Rensburl --- , South Africa A. J.H. Pieterse --- , South Africa J.N. Eloff --- , South AfricaMicrocystis aeruginosa toxic strain UV-006 stored a fixed amount of polyphosphate in spherical granules located in the centroplasm. Twenty four hours of phosphate starvation induced use of stored polyphosphate, manifested by reduction in granule numbers. Reintroduction of 2, 4 or... -
DETRIMENTAL EFFECTS OF FENTHION (QUELETOX® UL), USED TO CONTROL RED-BILLED QUELEA (QUELEA QUELEA), ON RHEOPHILIC BENTHIC MACROINVERTEBRATES IN THE ORANGE RIVER
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: R.W. Palmer --- Department of Water Affairs and Forestry, South AfricaThe relative abundance of rheophilic macroinvertebrates in the Orange River was assessed before and 15 hrs after two aerial applications of fenthion (QUELETOX® UL) above roosting sites of the red-billed quelea (Quelea quelea). The first treatment had no detectable effect... -
The effect of the colonisation extent of arbuscular mycorrhizal fungi on the growth of pot grown Pterocarpus angolensis seedlings
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: S.N. Hengar --- Department of Forest Science, USA A.J. Valentine --- Department of Environmental Science, USA J.M. Theron --- Department of Forest Science, USAThe effect of the level of arbuscular mycorrhizal fungi (AMF) colonisation on the growth of Pterocarpus angolensis was studied. Mycorrhizal infected seedlings, showing either good or poor growth, under the same environmental conditions (temperature, humidity, light level) were analyzed for... -
Phosphorus fertiliser source and weed control effects on growth of three-year-old second-rotation Pinus radiata on Orthic Pumice soil in New Zealand
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: AA Rivaie --- , Indonesia P Loganathan --- Soil and Earth Sciences, Institute of Natural Resources, New ZealandLittle information is available on the interactive effects of soluble and less-soluble phosphorus (P) fertilisers and weed control on growth and P nutrition of second-rotation Pinus radiata plantations. A study was initiated on three-year-old second-rotation P. radiata and to determine... -
Alternative approaches to Red-billed Quelea Quelea quelea management: mass-capture for food
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Clive CH Elliott --- Blue Barn House, South Leigh, UK Boaz N Mtobesya --- Plant Health Services, Tanzania Robert A Cheke --- Natural Resources Institute, UKOrganophosphate pesticide spraying or the deployment of explosives as standard practices for controlling quelea breeding colonies or roosts that threaten small-grain crops in Africa have negative side-effects on non-target birds and on the environment. Mass-capture techniques were tested as an... -
The usage and efficacy of a combination analgesic preparation
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: M Raff --- Pain management unit, South AfricaCombination analgesics are frequently prescribed for the treatment of a multitude of conditions. Many of these preparations contain agents with no proven analgesic efficacy. We examined 3059 patients using a new combination agent containing only paracetamol, codeine, and ibuprofen. It... -
The Effects of Phosphate Fertilizers and Manure on Maize Yields in South Western Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: J. S. Ademba --- Kenya Agricultural Research Institute (KARI) Kisii, Kenya J. K. Kwach --- Kenya Agricultural Research Institute (KARI) Kisii, Kenya A. O. Esilaba --- Kenya Agricultural Research Institute (KARI) Headquarters, Kenya S. M. Ngari --- Egerton University, KenyaPhosphorus, nitrogen and Striga hermonthica are the major constraints to maize production in the Nyanza Province of Kenya. Field trials were conducted on-farm in Nyanza Province to investigate the effects of phosphate fertilizers and manure on maize yields. The experimental... -
Evaluation of the effects of phosphorus and nitrogen source on aerial and subsoil parameters of maize (Zea mays L.) during early growth and development
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Pieter-Ernst Coetzee --- Department of Soil, Crop and Climate Sciences, South Africa Gert M Ceronio --- Department of Soil, Crop and Climate Sciences, South Africa Chris C du Preez --- Department of Soil, Crop and Climate Sciences, South AfricaUnderstanding the nutrient requirements of maize is especially important during early vegetative growth and development, particularly when produced on highly weathered soils with low organic matter contents. Therefore, the growth response of maize to different nitrogen (N) sources viz. limestone... -
Identification and molecular characterisation of Colletotrichum species from avocado, citrus and pawpaw in Ghana
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Joseph O Honger --- Soil and Irrigation Research Centre, School of Agriculture, College of Basic and Applied Sciences, Ghana Samuel K Offei --- Biotechnology Centre, College of Basic and Applied Sciences, Ghana Kwadwo A Oduro --- Department of Crop Science, School of Agriculture, College of Basic and Applied Sciences, Ghana George T Odamtten --- Botany Department, College of Basic and Applied Sciences, Ghana Seloame T Nyaku --- Department of Crop Science, School of Agriculture, College of Basic and Applied Sciences, GhanaOwing to previous identifications based solely on morphological characteristics, the identity of the causal agents of anthracnose disease of pawpaw and avocado in Ghana is in doubt. In addition, the pathogen has not been identified previously on citrus. In this... -
Effect of phosphorus and nitrogen sources on essential nutrient concentration and uptake by maize (Zea mays L.) during early growth and development
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Pieter-Ernst Coetzee --- Department of Soil, Crop and Climate Sciences, South Africa Gert M Ceronio --- Department of Soil, Crop and Climate Sciences, South Africa Chris C du Preez --- Department of Soil, Crop and Climate Sciences, South AfricaIn South Africa, maize is often produced on highly weathered soils with low organic matter contents. These soils are unable to supply sufficient nitrogen (N) and phosphorus (P) for sustainable maize production, resulting in the use of fertiliser sources containing... -
Phosphorus extraction by selected methods in alkaline and calcareous soils after mono-ammonium phosphate application at different rates
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: AE Venter --- , South Africa CC du Preez --- , South AfricaLittle research has been done on extractable phosphorus (P) in alkaline and calcareous irrigated soils of South Africa. This study aimed to quantify extractable P by selected methods in these soils after application of mono-ammonium phosphate (MAP) at different rates... -
The effect of superphosphate on the productivity of mucuna (Mucuna pruriens) on a sandy loam soil in Zimbabwe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.D. Shoko --- Department of Agronomy, University of Stellenbosch, Private Bag X1, RSA P.J. Pieterse --- Department of Agronomy, University of Stellenbosch, Private Bag X1, RSA G.A. Agenbag --- Department of Agronomy, University of Stellenbosch, Private Bag X1, RSAPositive responses to increased soil phosphorus (P) supply have been noted for several leguminous species including mucuna (Mucuna pruriens). The major objective of this research was to investigate the effect of P level of 40 kg P ha-1 on the...