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The Influence of Site Factors on the Foliar Nutrient Content of Eucalyptus grandis in Natal
Item type: Journal Article • Journal: South African Forestry Journal • Authors: M.A. Herbert --- Institute for Commercial Forestry Research, South AfricaAlthough foliar analysis is commonly used to diagnose the nutritional status of trees and their ability to respond to fertilising, it is also a measure of site type and quality. The availability of nutrients in the soil varies with climatic... -
Responses of four perennial pasture legumes to soil amendment with lime and superphosphate
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: D L Barnes --- Department of Agriculture and Water Supply (Transvaal Region),Yield response of crownvetch (Coronilla varia) cv. Penngift, lucerne (Medicago sativa) cv. CUF 101, white clover (Trifolium repens) Dusi type and Kenya white clover (T. semipilosum) cv. Safari to differential application of lime and superphosphate were determined in a 5... -
Lime and phosphorus effects on the dry matter production of eragrostis curvula on dystrophic clay soils
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N. Miles --- Department of Soil Science and Agrometeorology, J.M. de Villiers --- Department of Soil Science and Agrometeorology,The dry matter yield responses of Eragrostis curvula to P and lime over two seasons on Balmoral and Balgowan soil series in the Natal Mistbelt are discussed. With this work forming part of a study aimed at characterizing P fixation... -
Relations between soil factors and herbage yields of natural grassland on sandy soils in the south‐eastern Transvaal
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: D.L. Barnes --- Department of Agricultural Development (Transvaal Region), Republic of South Africa M. Swart --- Department of Agricultural Development (Transvaal Region), Republic of South Africa M.F. Smith --- , Republic of South Africa G.H. Wiltshire --- , Republic of South AfricaForty systematically‐placed observation points were established in a 1.5‐ha area of floristically unifoim veld in which productivity varied spatially. At each point grass yields were determined by harvesting quadrats at eight‐week intervals during the growing season, and the volumetric water... -
A field evaluation of the differential tolerance to soil acidity of forty-eight South African maize cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Ana Paula Mendes --- Summer grain Sub-Centre, M. P.W. Farina --- Summer grain Sub-Centre, P. Channon --- Summer grain Sub-Centre, Marie Smith --- Biometry Section, Directorate of Biometrie and Datametric Services,A field experiment was conducted on a Normandien clay loam (Plinthic Paleudult) to compare the acid tolerance of 48 commercially grown maize (Zea mays L.) cultivars. Cultivars were compared in terms of grain yield, plant height and leaf Al content... -
'n Vergelyking van verskillende metodes vir die ekstraksie en bepaling van aluminium in grond
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Mardel Pretorius --- Hoëveldstreek, Departement van Landbou en Watervoorsiening, Republiek van Suid-Afrika D.J. Beukes --- Hoëveldstreek, Departement van Landbou en Watervoorsiening, Republiek van Suid-AfrikaVier metodes vir die ekstrahering en bepaling van Al in suur gronde is vergelyk vir grondmonsters vanaf 'n verskeidenheid van bronne en met pH (KCl) waardes tussen 3,3 en 4,4. Die oogmerk was om 'n vinnige, eenvoudige, maar steeds betroubare... -
Comparison of aluminium, basic cations and acidity in the soil of indigenous forests and pine stands in the southern Cape
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.E. Clough --- Saasveld Forestry Research Centre, Republic of South AfricaLitter and topsoil were sampled in plantations of Pinus elliottii and Pinus taeda and in adjacent indigenous forest in three different locations in the southern Cape, to study some of the effects on the soil of the establishment of pine... -
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... -
The use of a sewage sludge as a fertilizer for wheat in a glasshouse pot experiment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.C. Hughes --- Department of Agronomy, Republic of South Africa A.D. Noble --- Department of Agronomy, Republic of South Africa S. Scott-Brown --- Department of Agronomy, Republic of South AfricaAcid soil infertility is a major limiting factor in crop production on soils along the eastern seaboard of South Africa. Invariably this problem is addressed by effectively liming the topsoil with little influence on subsoil acidity. A study was conducted... -
Die invloed van grondsuurheid op koringkultivars (Triticum aestivum L.) met verskillende vlakke van aluminiumverdraagsaamheid in die Oos-Vrystaat. II. Wortelontwikkeling
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. J.H. Bosch --- , Republiekvan Suid-Afrika W.M. Otto --- , Republiekvan Suid-Afrika J.J. Human --- Departement Agronomie, Republiek van Suid-Afrika'n Veldproef is uitgevoer in die Oos-Vrystaat om te bepaal of kultivars wat verskil in aluminium (Al)-verdraagsaamheid ook verskil in wortelontwikkeling by verskillende grondsuurheidsvlakke. Drie kultivars wat varleër in Al-verdraagsaamheid is by vier grondsuurheidsvlakke in 'n verdeelde-perseelontwerp getoets. Die twee... -
Relationship between acid saturation and hydrogen activity of soils from different districts in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Bloem --- Department of Agriculture, Conservation and Environment, North West Province, Republic of South AfricaSoil analyses results from six districts in the western maize producing areas of South Africa were used for correlating exchangeable acidity and acid saturation with hydrogen ion activity (pH). From the resulting regression equations, the pH values that corresponded with... -
Acidic iron oxide waste as a conditioner for calcareous soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R. Campbell --- Department of Soil Science, Republic of South Africa R.D. O'Brien --- Department of Soil Science, Republic of South Africa M.V. Fey --- Department of Soil Science, Republic of South AfricaA fine-grained iron oxide (hematite, (α-Fe2O3), containing 1.2% hydrochloric acid by mass, is the main by-product of an acid recovery plant at Saldanha Bay. The alkalinity of calcareous soils in this semi-arid region causes plant deficiencies in many trace elements,... -
Effect of bearing position on fruit quality of mandarin types
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.S. Verreynne --- Department of Horticultural Science, South Africa E. Rabe --- Department of Horticultural Science, South Africa K.I. Theron --- Department of Horticultural Science, South AfricaDifferences in juice quality are associated with positional differences in canopy microclimate and exposure of individual fruit to light and temperature. Differences of internal fruit quality between fruit from different sectors of the tree were investigated. The trials were carried... -
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... -
Influence of long-term wheat residue management on acidity and some macronutrients in an Avalon soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: E. Kotzé --- Department of Soil, Crop and Climate Sciences, 9300 Republic of South Africa C.C. du Preez --- Department of Soil, Crop and Climate Sciences, 9300 Republic of South AfricaThis study was initiated to determine the influence of different wheat residue management practices, that were sustained for about 20 years, on some fertility indicators of an Avalon soil in a long-term trial near Bethlehem in the eastern Free State... -
Multivariate analysis of selected allied chemical properties of soils close to an abandoned manganese mine
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G. E. Ekosse --- , South Africa P. S. Fouche --- , South AfricaThis study aimed at understanding the statistical relationships between base saturation percent (BSP), cation exchange capacity (CEC), pH(water) and electrical conductivity (EC) in soils within close proximity to the abandoned Kgwakgwe Mn oxide ore mine, Botswana. Four hundred soil samples... -
Spatial distribution of selected chemical properties of soils situated close to an abandoned manganese mine
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G. E. Ekosse --- , South Africa P.S. Fouche --- , South AfricaThis study aimed at understanding the spatial distribution of the base saturation percentage (PSB), cation exchange capacity (CEC), pH(water) and electrical conductivity (EC) in soils situated close to the abandoned Kgwakgwe Mn oxide ore mine, Botswana. Four hundred soil samples... -
Effects of liming on microbial activity and N mineralization in broiler manure-amended soils from Bizana, Eastern Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.G. Jezile --- Department of Soil and Crop Sciences, USA D.G. Westfall --- Department of Soil and Crop Sciences, USA G. Peterson --- Department of Soil and Crop Sciences, USA D.R. Child --- Department of Rangeland Ecosystem Sciences, USA D.P. Turner --- , RSA W. Van Averbeke --- , RSAA laboratory incubation study was conducted to determine the effects of liming on microbial activity and N mineralization in two Bizana soils amended with broiler manure. The experimental layout was a 4 x 3 complete factorial experiment with three replicates,... -
Effects of liming and inorganic fertiliser application on soil properties and maize growth and yield in rural agriculture in the Mbizana area, Eastern Cape province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: DJ Beukes --- , South Africa TC Mapumulo --- , South Africa TP Fyfield --- , South Africa GG Jezile --- , South AfricaA five-year study was conducted to assess the seasonal and medium-term effects of liming and fertilisation of an acid clay loam topsoil on soil properties and on the growth and yield of maize under dry land. Treatments consisted of a... -
Soil fertility management in pasture small-plot trials: potential pitfalls
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: N. Miles M.B. HardySmall-plot cutting trials are of particular importance in research relating to intensive pastures. Undetected changes in soil fertility during the course of experimentation may detract from the validity of results in trials of this kind. Information from field trials conducted... -
Impact of marine influence and cultivation on the diatom flora of Thiaroye Pond, Dakar, Senegal
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EH Sow --- Department of Geology, Senegal CAK Fofana --- Department of Geology, Senegal C Aw --- Department of Geology, Senegal PM Ndiaye --- Department of Geology, SenegalDuring a limnological and palaeolimnological study of the western part of the Great Coast of Senegal, an analysis of diatoms was carried out in Thiaroye Pond in the suburbs of Dakar. Current diatom flora in the water and on floating... -
Effect of residue and fertiliser management on soil fertility in a long-term sugarcane trial in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sandile Mthimkhulu --- South African Sugarcane Research Institute, South Africa Neil Miles --- South African Sugarcane Research Institute, South Africa Rianto van Antwerpen --- South African Sugarcane Research Institute, South Africa Dimpho Elephant --- South African Sugarcane Research Institute, South AfricaUnderstanding the impact of long-term continuous addition of sugarcane residues and fertiliser on soil fertility is important for development of best management practices. The experiment commenced in 1939. The fertility of the 0–10 cm soil layer was affected by the... -
The effectiveness of coal fly ash in the amelioration of acid soils of the South African highveld: a comparison with conventional liming materials
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: JR Harper --- , South Africa I Mbakwe --- , South AfricaSoil acidity is one of the greatest limitations to crop production in South Africa, while the country’s coal-fired power plants generate millions of tonnes of alkaline coal ash per year. A field experiment was carried out to evaluate the liming... -
Contrasting effects of soil pH on seed germination and early seedling growth of Calobota sericea and Lessertia frutescens subs. frutescens
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Francuois L Müller --- ,This study evaluated the impacts of pH on the germination and early seedling growth of Calobota sericea and Lessertia frutescens subsp. frutescens, two perennial legume species found in the semi-arid rangelands of South Africa. The results of this study revealed... -
Effects of form, fineness and placement of lime with and without soil tillage on barley and canola growth and development
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: JR van der Nest --- , South Africa AG Hardie --- , South Africa J Labuschagne --- , South Africa PA Swanepoel --- , South AfricaNo-tillage systems and slow movement of surface-applied limestone can lead to stratification of soil acidity. Incorporation of lime by tilling soil is not preferred by producers following conservation agriculture practices. There is limited research on ways to facilitate lime movement... -
Long-term effects of micro-fine and class A calcitic lime application rates on soil acidity and rooibos tea yields under Clanwilliam field conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jacobus FN Smith --- , South Africa Ailsa G Hardie --- , South AfricaPrevious research on the effect of soil liming on rooibos tea growth was limited to short-term greenhouse trials. This is the first long-term field study to investigate the effect of lime application on rooibos tea production. Micro-fine and class A... -
Liming guidelines for soils under wheat cropping in the eastern Free State, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: HJJ van Zyl --- University of the Free State, South Africa CC du Preez --- University of the Free State, South AfricaSoil acidity hampers the sustainability of wheat production in the eastern Free State, South Africa. Specific guidelines for liming are needed by farmers and advisors to ameliorate this condition. In this study, soils from four representative wheat producing farms were... -
Xenopus laevis embryos and tadpoles as biological indicators of acidic waters
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: LorrenK. Haywood --- University of the Witwatersrand, South AfricaXenopus laevis embryos and tadpoles show graded responses in terms of their hatching success, growth rate and incidence of malformations when exposed to acidity. These responses mean that they are good bioindicators of acidic waters. Exposure to a pH less... -
Calculating soil titratable acidity from routine soil analyses of cultivated South African soils using various model structures
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: VG White --- Citrus Research International, South Africa PJ Raath --- Citrus Research International, South Africa AG Hardie --- Stellenbosch University, South Africa V van der Berg --- Stellenbosch University, South Africa GF Sutton --- Rhodes University, South AfricaSoil titratable acidity (TA) is determined through extraction with an acetate-buffered salt solution (potassium sulphate, K2SO4) and is routinely used to predict the soil lime requirement using the Eksteen method. Soil TA is not always reported by commercial soil testing...