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Physical and clay mineralogical properties of some Natal and eastern Transvaal soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Cass --- , Australia M.A. Johnston --- Department of Agriculture and Water Supply,Soils, collected from the south-eastern Transvaal, Natal north coast and the more arid areas of the Natal interior, were examined using physical, chemical and mineralogical methods. Most of the soils were associated with particular management problems such as poor internal... -
Kleimineralogie, katioonuitruilkapasiteit en waterhouvermoë van grondvorms in die Hoëveldstreek
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: AstridM. Hattingh --- Hoëveldstreek, Departement van Landbou en Watervoorsiening,Kleimineralogiese data vir 12 grondvorms, wat algemeen in die Hoëveldstreek voorkom, is ondersoek. Die persentasie monsters waarin 'n bepaalde kleimineraal voorkom, is bereken. Daaruit is dit duidelik dat smektiet algemeen in gronde van die Arcadia-, Bonheim, en Rensburgvorms voorkom, maar... -
The effect of lime, KCl and parent material on the cation exchange capacity of some acid subsoils of the western Cape
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Wooldridge --- , Republic of South AfricaCation exchange capacity (CEC) values obtained by 22Na dilution for a number of mineralogically diverse acid subsoils reflected positive responses to lime and to treatment with KCl such that: CEC (unlimed, no KCl) < (unlimed + KCl) < (limed, no... -
Effect of liming and parent material on the potassium quantity/intensity relationships of some upland soils of the western Cape
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Wooldridge --- , Republic of South AfricaLiming and parent material had major effects on the potassium (K) quantity/intensity (Q/l) relationships of a varied group of naturally base-depleted upland soils of the western Cape. Departures from the usual Q/l curve form were observed, the individual curve sections... -
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... -
Soil mineralogy research in South Africa, 1978 to 2002 - a review
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C. Bühmann --- , South Africa B.J. Escott --- Soil Science, South Africa J.C. Hughes --- Soil Science, South AfricaOver 160 publications that contain mineralogical information were produced in the last 25 years of which about half were published in national and international journals. In many articles mineralogical data were presented but not discussed. Most studies were concerned with... -
Physical crust formation and steady-state infiltration rate in soils dominated by primary minerals in some South African ecotopes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Adornis D Nciizah --- Department of Agronomy, South Africa Isaiah IC Wakindiki --- Department of Agronomy, South AfricaPhysical crust formation is affected by the inherent soil properties such as texture and mineralogy. However, inconsistencies exist in soil mineralogy effects of soil crusting. In addition, investigations of soils dominated by primary minerals such as quartz, especially in South... -
Wrong pedogenetic assumptions: a case study of the soils developed over talc in Southern Guinea Savanna of Nigeria using clay mineralogy
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Godwin A Ajiboye --- Department of Soil Science and Land Management, Nigeria JA Ogunwale --- Department of Agronomy, Nigeria James Talbot --- K/T Geoservices Inc., USA Samuel A Mesele --- Department of Soil Science and Land Management, NigeriaIt is often assumed that ultrabasic parent material leads to the formation of soils rich in 2:1 clays and dibasic cations. However, in a tropical environment with intense weathering, this assumption may not be true. To investigate this assumption soil... -
Prediction of primary salinity, sodicity and alkalinity in South African soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J Piet Nell --- Agricultural Research Council–Institute for Soil, South Africa Cornelius W van Huyssteen --- Department of Soil, Crop and Climate Science, South AfricaSeveral attempts have in the past been made to map the primary salinity, sodicity and alkalinity of South African soils. These have typically been based on personal experience and/or limited data and also failed to quantify the accuracy of prediction... -
Potassium fractions and availability for chickpea (Cicer arietinum) in Vertisols of north-west Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Yohannes Misskire --- Debre Markos University, Ethiopia Tekalign Mamo --- Center for Soil and Fertilizer Research in Africa, Morocco Abi M Taddesse --- Department of Chemistry, Ethiopia Uri Yermiyahu --- Gilat Research Center, Agricultural Research Organization, IsraelFor a critical appraisal of the supplying power of potassium (K) and to predict bioavailable K, it is necessary to have knowledge on the fractions of K and evaluate soil test methods for plant nutrition. This research aimed to assess... -
Preliminary mineralogical and geotechnical characteristics of Zogbodomey clays in the coastal sedimentary basin of Benin (West Africa)
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Sémondji Salvien Pyrrhus Agbon --- Département des Sciences de la Terre, Bénin Nelly Carine Kelome --- Département des Sciences de la Terre, Bénin Luc Adissin Glodji --- Département des Sciences de la Terre, BéninThe Benin coastal sedimentary basin is filled with deposits of clays of diverse nature. This study focused on the characteristics of clayey materials of Zogbodomey in sight of their valorization in the construction and ceramics sectors. The clay deposit is...