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Evidence of Induced Nutrient Deficiency in Pine Plantings on Previously Cropped Lands
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A.W. Schumann --- , South Africa A.D. Noble --- , South AfricaWidespread establishment failures of Pinus species have recently occurred on agricultural land acquired for commercial forestry in South Africa. These include about 10 000 ha of previously tilled soils in the north-eastern Cape belonging to Mondi Forests. A lettuce (Lactuca... -
Suppression of seed germination and early seedling growth by plantation harvest residues
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.W. Schumann --- , Republic of South Africa K.M. Little --- , Republic of South Africa N.S. Eccles --- , Republic of South AfricaThe role of forestry plantation residues (leaf and branch) in the suppression of establishment of four weed species (Conyza sumatrensis, Trifolium spp., Echinochloa utilis and Lactica sativa) was investigated. Of the three residue types used, Pinus patula residues were found... -
Some observations on rodent and antelope damage in commercial forest plantations
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.S. Eccles --- , Republic of South Africa K.M. Little --- , Republic of South AfricaThe impact of various weeding and site-preparation treatments on Acacia mearnsii and Pinus patula damage by mammalian pests was assessed. Browsing by small antelope on Acacia mearnsii was significantly less in areas where harvesting residues had been retained rather than... -
Maize cultivars differ in tolerance to imazethapyr
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.J. van Wyk --- Department of Plant Production and Soil Science, Republic of South Africa C.F. Reinhardt --- Department of Plant Production and Soil Science, Republic of South AfricaThe low tolerance of maize (Zea mays L.) to imazethapyr ((±)-2-[4,5-dihydro-4 methyl-4-(1 -methylethyl)-5-oxo 1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acid) resulted in extensive crop damage in 1992/93 due to residue carry-over from resistant soybean (Glycine max L.). Pot experiments were conducted to assess the role... -
Effect of tillage system and nitrogen fertilization on yield and yield components of maize in Western Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D. Tolessa --- Department of Soil, Crop and Climate Sciences, South Africa C.C. Du Preez --- Department of Soil, Crop and Climate Sciences, South Africa G.M. Ceronio --- Department of Soil, Crop and Climate Sciences, South AfricaThe western part of Ethiopia has a high maize production potential as a result of favourable environmental conditions. However, maize production is constrained by non-sustainable cropping practices, particularly plough- or hoe-based cultivation, soil and water loss due to erosion, as... -
The effect of supplements of crop residues based diets on the performance of steers grazed on natural pasture during the dry season
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: EM AregheoreTwenty-four White Fulani steers, 20-26 months old, mean initial live weight of 270.6 ± 0.5kg, were divided into three treatment groups to investigate the effects of crop residues supplementation on performance when grazed on natural pasture during the dry season... -
An assessment of factors affecting early survival and growth of Pinus patula and Pinus elliottii in the summer rainfall region of southern Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: C. A. Rolando K. M. LittleHigh initial mortality of pine seedlings planted in commercial timber plantations in the summer rainfall region of southern Africa has motivated research into possible causes. The objectives of this study were to assess whether survival and initial growth of Pinus... -
The pollution status of Lake Nakuru, Kenya: heavy metals and pesticide residues, 1999/2000
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: WJ Mavura --- Department of Chemistry, Kenya PT Wangila --- Department of Chemistry, KenyaThis study was carried out from April 1999 to May 2000 to investigate the extent of pollution of Lake Nakuru. Water, sediment, fish and algae collected from the lake and its feeder rivers during the dry and rainy seasons were... -
Survival and growth of Pinus patula at two years in response to harvest residue and pest management, in Mpumalanga, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Carol Rolando --- , Ross Allan --- ,Previous research has indicated that the presence of harvesting residues, post-planting tern perature and rainfall, and insect pests and diseases, are among the main causes of mortality during re-establishment of Pinus patula stands. The main objectives of this work were... -
Effects of temperature on Pinus patula seedlings growing in pots in a controlled environment
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Colleen A. Carlson --- Horticultural Science Department, South Africa Ross Allan --- Shaw Research Centre, South Africa Andrew R. Morris --- Shaw Research Centre, South AfricaThe re-establishment of Pinus patula seedlings into sites with high harvesting residue (slash) loads can negatively affect the survival of these plants. Field trials have examined the role that insect pests and fungal diseases play in causing this phenomenon. Research... -
Machine productivity and residual harvesting residues associated with a cut-to-length harvest system in southern Tasmania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: MR Ghaffariyan --- , Australia J Sessions --- Department of Forest Engineering, Resources and Management, USA M Brown --- Office of PVC Research, AustraliaThe cut-to-length method is a preferred method for harvest of pine plantations in Australia. The cut-to-length method studied in southern Tasmania consists of a feller-buncher, processor, forwarder, grapple loader and tractortrailers that were producing only pulp logs for the plantation... -
On a Constant Arising in the Analysis of Bit Comparisons in Quickselect
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: PeterJ. Grabner Helmut ProdingerA (real) constant that appears as the factor of the leading term of the average number of bit comparisons required by quickselect, and was originally given in terms of complex numbers, is expressed using real numbers alone. A further representation... -
Maize responses to reduced tillage, different plant residue mulch and nitrogen fertiliser on granitic sandy soils of Zimbabwe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Walter Mupangwa --- International Maize and Wheat Improvement Centre (CIMMYT), Southern Africa Regional Office, Zimbabwe Isaiah Nyagumbo --- International Maize and Wheat Improvement Centre (CIMMYT), Southern Africa Regional Office, Zimbabwe Eleanor Mutsamba --- International Maize and Wheat Improvement Centre (CIMMYT), Southern Africa Regional Office, Zimbabwe Blessing Mhlanga --- International Maize and Wheat Improvement Centre (CIMMYT), Southern Africa Regional Office, Zimbabwe Jefias Mataruse --- International Maize and Wheat Improvement Centre (CIMMYT), Southern Africa Regional Office, ZimbabweMulching in smallholder conservation agriculture (CA) systems is constrained by lack of adequate crop residues. A three-year study assessed the effects of reduced tillage systems combined with different plant residue mulch and nitrogen (N) fertiliser on nitrogen uptake using the... -
Integrated influence of soil tillage, nitrogen–potassium fertiliser and mulching on pineapple (Ananas comosus (L.) Merr.) growth and yield
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Elvire L Sossa --- Research Unit of Eco-Pedology, Laboratory of Soil Sciences, Faculty of Agronomic Sciences, Benin Codjo E Agbangba --- Laboratory of Research in Applied Biology, Department of Environmental Engineering, Polytechnic School of Abomey-Calavi, Benin Guillaume L Amadji --- Research Unit of Eco-Pedology, Laboratory of Soil Sciences, Faculty of Agronomic Sciences, Benin Kossi E Agbossou --- Laboratory of Hydraulic and Water Control, Faculty of Agronomic Sciences, Benin Djidjoho J Hounhouigan --- Laboratory of Nutrition and Food Sciences, Faculty of Agronomic Sciences, BeninPineapple is one of the most important fruit in the world and its production requires appropiate cultural practices. This work aimed to investigate the influences of soil tillage, nitrogen–potassium (N-K) fertiliser and mulching on pineapple growth and yield. The experimental... -
Comparison of soil phosphorus fractions after 37 years of wheat production under different management practices in a semi-arid climate
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: K Ncoyi --- , South Africa CC du Preez --- , South Africa E Kotzé --- , South AfricaCrop residue management is important for enhancing soil fertility and productivity which leads to an increase in crop yields. A long-term trial, situated near Bethlehem in the Eastern Free State in South Africa, was established to determine the influence of... -
Effect of harvest residue management on soil properties of Eucalyptus hybrid and Acacia mangium plantations planted on steep slopes in northern Vietnam
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Nguyen Van Bich --- , Australia Alieta Eyles --- , Vietnam Daniel Mendham --- , Australia Tran Lam Dong --- , Vietnam Katherine J. Evans --- , Australia Vo Dai Hai --- , Vietnam Caroline Mohammed --- , AustraliaBurning harvest residues during site preparation can compromise the soil-nutrient stock in short-rotation plantations, but this practice remains common in northern Vietnam. This study compared the effect of two contrasting harvest-residue treatments (burning vs retention) on soil total carbon (TC),... -
Soil C sequestration and CO2 fluxes under maize-based Conservation Agriculture systems in the Eastern Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Lindah Muzangwa --- , South Africa Pearson Nyari Stephano Mnkeni --- , Tanzania Cornelius Chiduza --- , South AfricaTraditional farming methods deplete soil carbon and contribute to carbon dioxide (CO2) emissions. We investigated the effects of Conservation Agriculture principles on C sequestration and CO2 flux from two agroecological regions in the Eastern Cape province, South Africa, over five... -
Residue loads in amphibians used as biomarkers of pesticide levels entering food chains in sub‐Saharan Africa
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: MichaelR.K. Lambert --- University of Greenwich, United KingdomResidues accumulate rapidly in amphibians to reach lethal levels. During previous years in Zimbabwe, total DDT residues from general agricultural contamination were at 3.90 ppm wet weight in Bufo gutturalis and 1.50 ppm in Ptychadena anchietae. Dieldrin residues in the...