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The effect of nitrogen and manganese on the aroma of flue-cured tobacco
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.S. Whitehead --- Department of Botany, Republic of South Africa C.J. Steenkamp --- , Republic of South AfricaSeveral volatile compounds are produced on curing fully aromatic tobacco leaves. In contrast, no volatiles are produced by ‘putty’ leaves. A clear correlation exists between the production of flavour compounds and the retention of structural integrity in the leaves after... -
Concentration, accumulation and uptake rate of Cu, Fe, Mn and Zn by wheat under irrigation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.C. du Preez --- Department of Soil Science, Republic of South Africa A. T.P. Bennie --- Department of Soil Science, Republic of South AfricaThe objective of this study was to obtain information on the Cu, Fe, Mn and Zn uptake patterns of wheat (Triticum aestivum L.) grown under normal irrigation farming conditions. Except for irrigation scheduling, the 13 farmers on whose farms the... -
Effect of zinc carrier on mobilisation of foliar-applied zinc above and below the point of application in ‘Kakamas’ peach seedlings
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Wooldridge --- , Republic of South Africa C. Schutte --- , Republic of South AfricaIn a pot trial using coarse sand as a potting medium and modified (low zinc) Hoagland solution as a nutrient source, single mid-shoot leaves of mildly zinc deficient ‘Kakamas’ peach seedlings were periodically dipped into aqueous solutions, prepared at 20... -
Indications of ferrolysis and structure degradation in an Estcourt soil and possible relationships with plinthite formation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P. A.L. le Roux --- Department Soil, Crop and Climate Sciences, Republic of South Africa C.C. du Preez --- Department Soil, Crop and Climate Sciences, Republic of South Africa C. Bühmann --- , Republic of South AfricaGeographic associations of duplex soils, like the Estcourt form, and plinthic soils, like the Avalon and Westleigh forms, such as are found in the Eastern Free State, are recognised worldwide. These soils share redox morphology. In duplex soils, the redox... -
Micromorphological evidence of redox activity in the soft plinthic B horizon of a soil of the Bainsvlei form in an arid bioclimate
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.A.L. le Roux --- Department of Soil, Crop and Climate Sciences, Republic of South Africa C.C. du Preez --- Department of Soil, Crop and Climate Sciences, Republic of South AfricaIn South Africa, the pedogenic relevance of soft plinthic B horizons in the border zone between arid and semi-arid bioclimates is often questioned because the prevailing climate is not conducive for fluctuating water tables as required for their formation. These... -
The effects of a water treatment residue on grain yield and nutrient content in seeds of common dry beans (Phaseolus vulgaris L. cv. Ghadra) grown in a dystrophic soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.W. Titshall --- , South Africa J.C. Hughes --- , South AfricaThis glasshouse study investigated the grain yield and nutrient content of seed of common dry beans (Phaseolus vulgaris L. cv. Ghadra) grown in a dystrophic sandy soil treated with 0, 50, 100, 200 and 400 g kg−1 water treatment residue... -
The effect of degree and duration of water saturation on selected redox indicators: pe, Fe2+ and Mn2+
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: K. Smith --- Department of Soil, Crop and Climate Sciences, South Africa C.W. van Huyssteen --- Department of Soil, Crop and Climate Sciences, South AfricaIt was previously hypothesised that reduction in the soil will set in at 70% water saturation (S0.7). This study aimed to determine the effect of different degrees and durations of water saturation on reduction in soil. Reduction was measured as... -
Selected soil properties as indicators of soil water regime in the Cathedral Peak VI catchment of KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: BT Kuenene --- Department of Soil, Crop and Climate Sciences, South Africa CW van Huyssteen --- Department of Soil, Crop and Climate Sciences, South Africa PAL Le Roux --- Department of Soil, Crop and Climate Sciences, South AfricaThe morphological features and physicochemical properties of 14 soil profiles, representing the major soil types, were studied in the Cathedral Peak VI catchment of KwaZulu-Natal, South Africa. The soils are characterised by a high organic carbon content in the topsoil,... -
Relating the onset of reduction to degree of soil water saturation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Kimberly Smith --- Department of Soil, Crop and Climate Sciences, South Africa Cornelius W van Huyssteen --- Department of Soil, Crop and Climate Sciences, South AfricaLiterature does not indicate the degree of water saturation at which reduction is expected to occur. This study therefore aimed to determine the degree of water saturation (S) at which reduction is initiated. Soil cores were packed to a bulk... -
THE SUMMER CONDITION OF THREE EASTERN TRANSVAAL RESERVOIRS AND SOME CONSIDERATIONS REGARDING THE ASSESSMENT OF TROPHIC STATUS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R.D. Walmsley --- , South Africa D.F. Toerien --- , South AfricaSummer temperature, oxygen and light penetration profiles in the Da Gama, Klipkopje and Witklip Reservoirs are presented. Analysis of waters from different depths showed the presence of chemical stratification despite the absence of clear thermal stratification. An algal bioassay procedure... -
Sublethal effects of manganese on the haematology and osmoregulation of Oreochromis mossambicus after acute exposure
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: I Barnhoorn JHJ van VuurenOreochromis mossambicus were exposed for 96 hours to sublethal manganese concentrations in a continuous flow-through system. The sublethal concentrations were determined from the LC50 value of manganese (1.723mg/l), which included a 10% (172.3mg/l), 15% (259.8mg/l) and 20% (345.6mg/l) concentration of... -
Spatial variability of selected soil micronutrients under smallholder crop production in Zanyokwe, Eastern Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Alen Manyevere --- Department of Agronomy, South Africa Pardon Muchaonyerwa --- Discipline of Soil Science, School of Agriculture, Earth and Environmental Sciences, South Africa Pearson NS Mnkeni --- Department of Agronomy, South Africa Inos Dhau --- Department of Geography and Environmental Sciences, South AfricaUnderstanding spatial variability of soil nutrients, including that of micronutrients, is important for establishing best management practices in smallholder crop production. The objective of this study was to determine the status and spatial variability of potentially available zinc (Zn), copper... -
Aluminium and manganese leaching and retention in two contrasting soils treated with aluminium-based sludge water in a column experiment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S Dube --- , South Africa P Muchaonyerwa --- , South Africa F Mapanda --- , Zimbabwe JC Hughes --- , South AfricaLiquid waste (sludge water (SW)) from treatment of drinking water contains impurities which pose disposal challenges. Irrigation with SW could be a solution for the Morton Jaffray Water Works. This study was conducted to determine the effects of SW dilution...