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Effect of the amount of surface maize residue on infiltration and soil loss from a clay loam soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.M. Lang --- , Republic of South Africa J.B. Mallett --- , Republic of South AfricaSix levels of maize stover, expressed as percentage ground cover (0–75%) were compared under a rainfall simulator to assess the effect of surface residues on infiltration and soil loss on a clay loam soil with a 3,5% slope. Increasing the... -
Effect of exchangeable sodium and phosphogypsum on the hydraulic properties of several South African soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.M. du Plessis --- , I. Shainberg --- ,The susceptibility of soils to the deleterious effects of sodicity was assessed for samples which varied with respect to physical, mineralogical and other properties. For this purpose soil samples were collected from different locations in South Africa. The effect of... -
Characterizing the hydraulic properties of a semi-arid catchment by means of sorptivity measurements and scaling theory
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.H. Moolman --- Department of Soil and Agricultural Water Science, Republic of South AfricaThe variability of soil sorptivity within a semi-arid catchment was investigated on a macro- (28 ha) and microscale (16 m2). In the macroscale study, sorptivity was measured at 176 sites using a falling hydraulic head technique. The mean sorptivity of... -
A vacuum filtration and leaching method for the colorimetric determination of ammonium and nitrate nitrogen in soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. D.P. Botha --- , Republic of South Africa J.C. Johnson --- , Republic of South AfricaThe extracting solution and soil were separated by using vacuum filtration, followed by continuous leaching. The procedure was evaluated by spiking five different topsoil samples (having a wide range of physical and chemical properties) with ammonium nitrate and determining the... -
Economical manual estimation of ammonium, nitrate and total inorganic nitrogen in soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.H. Wiltshire --- Department of Soil Science, Republic of South Africa D.J. Laubscher --- Department of Soil Science, Republic of South AfricaColorimetrie methods for measurement of ammonium, nitrite and nitrate were modified (a) for application to small samples of nitrogen-poor soils, (b) by centrifugation of extracts to avoid contamination from filter papers and (c) to economize on apparatus and reagents. Estimates... -
Rate of dissolution of gypsum from different sources and its effect on water infiltration of soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H. Frenkel --- Department of Agronomy, Republic of South Africa M.V. Fey --- Department of Agronomy, Republic of South AfricaFive sources of gypsum (pure, mined and three industrial) were pressed into pellets and their dissolution rate when suspended in water compared by measuring electrical conductivity of the stirred solution. Pellets of industrial phosphogypsum from Phalaborwa, Potchefstroom and Richards Bay... -
An inexpensive, portable rain simulator: construction and test data
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.S. Claassens --- Department of Soil Science and Plant Nutrition, Republic of South Africa H. v.H. van der Watt --- Department of Soil Science and Plant Nutrition, Republic of South AfricaConstruction details of an inexpensive, portable rain simulator are given. The dismountable components are easily transported on a light truck. The flat spray nozzles used produced rain with a >90% coefficient of uniformity over a 1-m2 test plot. Drop sizes... -
Soil compaction under sugar cane (Saccharum hybrid sp.) cropping and mechanization in Mauritius
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.R. Ng Cheong --- , Mauritius K.F. Ng Kee Kwong --- , Mauritius C.C. Du Preez --- Department of Soil, Crop and Climate Sciences, South AfricaFarm machinery is increasingly used in sugar cane production in Mauritius and is expected to cause soil compaction. A study was undertaken to ascertain whether the five major cane-growing soil groups of Mauritius were being compacted as a result of... -
Winter cover crops effects on soil strength, infiltration and water retention in a sandy loam Oakleaf soil in Eastern Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: HA Mupambwa --- Department of Agronomy, South Africa IIC Wakindiki --- Department of Agronomy, South AfricaThere is substantial evidence that cover crops increase soil fertility and plant nutrition but the few studies concerning soil physical properties are conflicting. This study determined the effects of monocultures of vetch (Vicia dasycarpa L.), lupin (Lupinus angustifolius L.), oats... -
Effect of three grazing intensities on selected soil properties in semi‐arid west Texas
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: E.M. Seitlheko --- Department of Agronomy, United States of America B.L. Allen --- Department of Agronomy, United States of America D.B. Wester --- Department of Agronomy, United States of AmericaSoils in the study, carried out in the Texas Trans‐Pecos region, were fine‐loamy, mixed, thermic Aridic Calciustolls; fine‐loamy, mixed, thermic Aridic Ustochrepts; and fine, mixed, thermic Typic Chromusterts. Our primary objective was to determine the effect of three grazing intensities... -
A note on regular martingales in Riesz spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mareli Korostenski CoenraadC.A. LabuschagneWe consider regular martingales (i.e., martingales which can be written as differences of two positive martingales) in the measure-free setting of Riesz spaces. The aim of this note is to show that the space of such martingales is a Riesz... -
Microalbuminuria and estimated glomerular filtration rate
Item type: Journal Article • Journal: South African Family Practice • Authors: Y Veriava --- School of Clinical Medicine,Hypertension and diabetes mellitus are the major causes of renal damage and cardiovascular events. The co-existence of these conditions further increases the risk of progressive renal disease, cardiovascular events, and mortality. Urinary excretion of albumin, even in small amounts, and... -
A review of renal protection strategies
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Erna Meyer --- Northland District Health Board, Whangarei Base Hospital, New ZealandGlobally, more than 10 million people are affected every year by acute kidney injury (AKI) and approximately 6% of hospital patients sustain some degree of kidney injury during their hospital event. Reducing perioperative kidney injury may significantly improve patient outcomes... -
Diabetic nephropathy in a tertiary care clinic in South Africa: a cross-sectional study
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: P Ngassa Piotie --- MD, DTM&H, DipPHM, MPH, Student, School of Health Systems and Public Health, Faculty of Health Sciences, DG Van Zyl --- FCP(SA), MMed(Int), MSc(ClinEpi), PhD, Senior Lecturer, Department of Internal Medicine, P Rheeder --- FCP(SA), MMed(Int), MSc(ClinEpi), PhD, Senior Lecturer, Department of Internal Medicine,Objective: The aim of this study was to determine the prevalence of micro- or macroalbuminuria in type 1 and type 2 diabetic patients, and to examine the relationship with the diabetes control parameters such as haemoglobin (Hb)A1c, blood pressure (BP)... -
Characteristics and management options of crusting soils in a smallholder farming area of the Zambezi metamorphic belt in northern Zimbabwe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Alen Manyevere --- University of Limpopo, South Africa Courage Bangira --- Chinhoyi University of Technology, Zimbabwe Jephita Gotosa --- Bindura University of Science Education, Zimbabwe Lawrence Munjonji --- University of Limpopo, South Africa Emmanuel Chikwari --- Chemistry and Soil Research, ZimbabweCrusting and surface-sealing soils present productivity challenges to smallholder farmers despite their high inherent fertility. Crop production on crusting soils is costly due to unfavourable conditions such as surface capping and compaction, which hinder crop emergence. A study was conducted... -
Endometrial cancer with bone marrow metastases: a management dilemma
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: Bt Guzha --- Division of Gynaecology Oncology, Department of Obstetrics and Gynaecology, South Africa T Adams --- Division of Gynaecology Oncology, Department of Obstetrics and Gynaecology, South Africa L Rogers --- Division of Gynaecology Oncology, Department of Obstetrics and Gynaecology, South Africa N Mbatani --- Division of Gynaecology Oncology, Department of Obstetrics and Gynaecology, South Africa H-t Wu --- South African Medical Research Council (SAMRC)/University of Cape Town (UCT) Gynaecological Cancer Research Centre, South Africa N Fakie --- South African Medical Research Council (SAMRC)/University of Cape Town (UCT) Gynaecological Cancer Research Centre, South Africa J Opie --- Division of Haematology Pathology, South Africa La Denny --- Division of Gynaecology Oncology, Department of Obstetrics and Gynaecology, South AfricaA case is presented of a 67-year-old woman referred to the authors’ institution with endometrioid endometrial cancer with a leucoerythroblastic blood film and marked thrombocytopenia. On further evaluation, it was confirmed that she had grade 3 endometrial cancer with bone... -
Comparison of three soil health indicators between different vegetative strip compositions
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Robyn Nicolay --- , South Africa Simon Jeffery --- , United Kingdom Nicola Randall --- , United KingdomContemporary evidence shows biotic factors play a prominent role in the soil health and the provision of soil functions. Herbaceous grassland species differ in their modulation of soil communities, effects on soil components, as well the processes they interact with...