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‘N vergelyking tussen digitaria eriantha steud. subsp. eriantha (smutsvingergras) en eragrostis curvula (schrad.) nees (oulandsgras) as hooigewasse vir skape1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: C S Dannhauser --- , W L J Van Rensburg --- , D P J Opperman --- ,Smutsvingergras‐ en oulandsgrashooi is by drie bemestingspeile, naamlik 30 kg N + 2,8 kg P ha‐1; 90 kg N + 8,3 kg P ha‐1 en 150 kg N + 13,8 kg P ha‐1 geproduseer. Die hooi is in alle voorgenoemde... -
The response of Italian ryegrass to applied nitrogen in the natal midlands
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: R.J. Eckard --- Department of Agriculture and Water Supply (Natal Region),Nitrogen (N) fertilizer was applied to irrigated Italian ryegrass (Lolium multiflorum cv Midmar) pastures at varying rates over two seasons on three sites. Soils series on these sites were Metz, Griffin and Katspruit. Total N application rates ranged from zero... -
Influence of phosphatic fertilization on the yield and chemical composition of grass pasture
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N.F.G. Rethman --- Department of Agriculture & Water Supply, Republic of South Africa B.H. Beukes --- Department of Agriculture & Water Supply, Republic of South AfricaWhile the distribution of P fertilizer had an insignificant influence on the DM production of a grass pasture over a three‐year period, the level of both N and P was highly significant. Growth patterns were unaffected by any of the... -
Nutrition of intensive pastures in the summer rainfall areas of southern Africa
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N. Miles --- Department of Agricultural Development, Republic of South AfricaConsideration is given to the current state of knowledge regarding the nutrition of cultivated pastures in the summer rainfall areas of southern Africa. Research efforts over the years have concentrated on the nitrogen (N) requirements of pastures, with relatively little... -
A proposed mechanism for the volatilization of ammonia from fertilized neutral to alkaline soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.C. du Preez --- Department of Soil Science, R. du T. Burger --- Department of Soil Science,Ammonia volatilization from five soils, ranging in clay content from 7,6 to 49,9%, were determined after pH values of the soils were adjusted to 8,0. Ammonium sulphate, limestone ammonium nitrate, urea, monoammonium phosphate and diammonium phosphate were applied on the... -
Laboratory measurements of ammonia volatilization from five nitrogen-containing fertilizers after surface application at different rates on a neutral to alkaline soil
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 R. du T. Burger --- Department of Soil Science, Republic of South AfricaVolatilization losses of NH3 from five fertilizers, namely (NH4)2SO4, LAN, urea, MAP and DAP were determined. The fertilizers were applied to a Bainsvlei soil of which the pH was adjusted to 6,5; 7,6; 8,3 and 9,1. The application levels were... -
Effect of application methods on ammonia volatilization from soils in a controlled environment
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 R. du T. Burger --- Department of Soil Science, Republic of South AfricaThe objective of this investigation was to compare different application methods whereby ammonia losses from nitrogen fertilizers can be limited when applied to alkaline soils. Three application methods were simulated, namely broadcasting, ploughing under and band placement. Five nitrogen fertilizers,... -
A study of the mycorrhizal associations of Paulownia taiwaniana
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D. G.M. Donald --- Department of Silviculture, Republic of South Africa T.W. Hu --- Department of Forestry, Republic of China W-E. Cheng --- , Republic of ChinaThe mycorrhizal relationship of Paulownia taiwaniana was investigated on trees from six sites. The species exhibits an endomycorrhizal relationship. Soil spore counts and root colonization levels varied appreciably both between and within sites. Soil from the site with the lowest... -
Ammonia volatilization and denitrification losses from commercial fertilizers applied to soil samples
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. D.P. Botha --- , Republic of South Africa D.C. Pretorius --- , Republic of South AfricaNitrogen losses from nine nitrogen fertilizers, applied to four different topsoil samples, were compared in the laboratory. Total N losses were determined 28 days after application, as a difference between the extractable soil nitrogen initially and after 28 days. The... -
Die invloed van bemestingplasing op wortelontwikkeling van mielies
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. du Toit --- , Republiek van Suid-AfrikaVier behandelings waar bemesting op verskillende dieptes geplaas is, asook 'n geen-bemestingspeil as kontrole, is onder 'n stoppelbewerkingstelsel geëvalueer. Wortelontwikkeling is op drie stadiums gedurende die groeiseisoene ondersoek. Diep plasing van bemesting stimuleer afwaartse wortelontwikkeling, veral gedurende die vroeë vegetatiewe... -
Field response of three subtropical pasture legumes to lime, P and K on an acid sandy soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.J. Kruger --- , Republic of South Africa V.D. Wassermann --- , Republic of South Africa A.J. van der Merwe --- , Republic of South AfricaA field study was undertaken to determine the response of Macroptilium atropurpureum cv. Siratro, Stylosanthes guianensis CM. Oxley and Aeschynomene falcata cv. Bargoo to lime P and K on an acid soil, very low in minerals. The trial extended over... -
Urease-aktiwiteite in gronde van die sentrale besproeiingsgebiede in Suid-Afrika
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: F. P.J. Thormählen --- Departement van Grondkunde, Republiek van Suid-Afrika C.C. du Preez --- Departement van Grondkunde, Republiek van Suid-AfrikaDie oogmerk met die studie was om die omvang van urease-aktiwiteite in die besproeide gronde vas te stel en watter grondparameters dit beïnvloed. Die verloop van hidrolise is in agt gronde, afkomstig van die sentrale besproeiingsgebiede, gemonitor na toediening van... -
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... -
Fertilizer placement of maize: I. Grain yield and plant growth
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. du Toit --- , Republic of South Africa J.J. Human --- , Republic of South AfricaNormal fertilizer placement, two deeper than normal, broadcast and no fertilizer treatments were compared in a stubble tillage system in the north-western Free State. Plant growth, as indicated by leaf area, leaf dry mass and stem dry mass, was evaluated... -
Selenium in some grass pastures of Natal and fertilizer-induced Se uptake by ryegrass (Lolium multiflorum)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.P. Higgins --- Department of Agronomy, Republic of South Africa M.V. Fey --- Department of Agronomy, Republic of South AfricaSamples of irrigated ryegrass pasture and natural veld from various parts of Natal were found, with one exception, to lack the amount of Se normally considered sufficient (0.1 mg kg−1) for grazing animals. No soil properties could be identified by... -
Fertilizer placement of maize. II. Root growth and water use
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. du Toit --- , Republic of South Africa J.J. Human --- , Republic of South AfricaNormal fertilizer placement, two placements deeper than normal, a broadcast application and a non-fertilized control were compared to maximize production in a stubble tillage system. Root growth was evaluated at three growth stages from tassel initiation to flowering during the... -
Response of maize to ammonium nitrate, urea and cogranulated urea-urea phosphate
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O.A. Yerokun --- Department of Soil Science, ZambiaUrea fertilizers may lose N by ammonia volatilization when applied in the field. In order to reduce this loss, modified urea compounds are being used. Not all of them reduce ammonia loss and improve crop yields. A field study was... -
Ammonia volatilization from ammonium nitrate, urea and urea phosphate fertilizers applied to alkaline soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O.A. Yerokun --- Department of Soil Science, ZambiaThe volatilization of ammonia following applications of urea fertilizers to soils may release significant amounts of N into the atmosphere and reduce the plant available N. This study compared ammonia loss from urea phosphate (170 g N kg−1, 190 g... -
Soil nutrient contents, microbial properties and maize yield under long-term legume-based crop rotation and fertilization: a comparison of residual effect of manure and NPK fertilizers
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Belay --- Department of Plant Production and Soil Sciences, A.S. Claassens --- Department of Plant Production and Soil Sciences, F.C. Wehner --- Department of Microbiology and Plant Pathology, South AfricaA study was conducted in a field experiment that has been ongoing for over 60 years at the University of Pretoria, South Africa. The aim was to compare the residual effects of manure and NPK fertilizers on selected soil nutrients,... -
Effectiveness of cattle manure and nitrogen fertilizer application on the agronomic and economic performance of maize
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Nyamangara --- Department of Soil Science and Agricultural Engineering, M. Mudhara --- Department of Soil Science and Agricultural Engineering, K.E. Giller --- Department of Soil Science and Agricultural Engineering,The effects of N fertilizer and aerobically composted cattle manure, applied separately or in combination, on maize (Zea mays L.) grain yields and net benefits were determined over three seasons. A field experiment was established on a moderately leached sandy... -
Effects of early season and autumn nitrogen applications on young ‘Keisie’ canning peach trees on a sandy, infertile soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Wooldridge --- , South AfricaThe effects of autumn (A) and early season (S) nitrogen (N) applications were investigated in a young ‘Keisie’ canning peach orchard on an infertile sandy soil in the Western Cape Province, South Africa. Over the first four consistent bearing seasons,... -
Effects of potassium and early-season nitrogen applications on young ‘Keisie’ canning peach trees on a sandy, infertile soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Wooldridge --- , South AfricaThe effects of different rates of potassium (K) and early season nitrogen (SN) were investigated in a ‘Keisie’ canning peach orchard on a sandy, infertile soil, at 1111 trees ha−1, in the Western Cape Province, South Africa. Over the first... -
Effect of extending the early season potassium supply on young ‘Keisie’ canning peach trees on a sandy, infertile soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Wooldridge --- , South AfricaA field trial was carried out to investigate the effects of applying potassium (K), either in two equal parts at full bloom (FB) and 42 days after FB (2-way split); or as a 4-way split, commencing at FB, with three... -
Quality as a factor influencing the possible utilization of eight exotic legume species as mulches
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P. Ver Elst --- Department of Agronomy, P.J. Pieterse --- Department of Agronomy,Invasive exotic legumes need to be controlled by amongst others, mechanical control methods. Residues such as twigs and leaves of felled trees can possibly be utilized as a low cost, organic fertilizer. The quality of the organic materials influences their... -
Fate of nitrogen applied to maize on conventional and minimum tilled Nitisols 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 AfricaMaize production in western Ethiopia is practiced mainly on Nitisols inherently low in N. Neither conventional nor minimum tilled maize reaches its full yield potential without fertilization. A large amount of applied N usually escapes from the soil-crop system and... -
Maize fertilizer research over the last 25 years – an overview
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.J. van Biljon --- ,Maize yield as well as fertilizer practices have changed over the last 25 years. Average maize yield for South Africa increased from approximately 2.3 tons ha−1 in the early 1980s to approximately 3.5 tons ha−1 in recent years. The early... -
A comparison of different planting methods, including hydrogels, and their effect on eucalypt survival and initial growth in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: PaulW.M. Viero KeithM. LittleResearch to minimize mortality and enhance early growth during the re-establishment of eucalypts includes the use of optimum growing stock and planting techniques, the application of adequate volumes of water at planting (where appropriate), correct fertilizer application and placement, and... -
Silviculture and Yield
Item type: Journal Article • Journal: South African Forestry Journal • Authors: D. G.M. Donald --- ,Silvicultural factors affecting yield are briefly examined. It is concluded that while many aspects are significantly improving growth and yield, others are depressing them. Positive aspects are tree breeding, site preparation, fertiliser use, weed control, better silviculture and more enlightened... -
The Effects of Phosphate Fertilizers and Manure on Maize Yields in South Western Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: J. S. Ademba --- Kenya Agricultural Research Institute (KARI) Kisii, Kenya J. K. Kwach --- Kenya Agricultural Research Institute (KARI) Kisii, Kenya A. O. Esilaba --- Kenya Agricultural Research Institute (KARI) Headquarters, Kenya S. M. Ngari --- Egerton University, KenyaPhosphorus, nitrogen and Striga hermonthica are the major constraints to maize production in the Nyanza Province of Kenya. Field trials were conducted on-farm in Nyanza Province to investigate the effects of phosphate fertilizers and manure on maize yields. The experimental... -
Development of a charcoal-fuelled dryer for the production of organic fertilizer from hog waste
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: B.O. Akinnuli --- Department of Mechanical Engineering, Nigeria O.P. Bodunde --- Department of Mechanical Engineering, NigeriaThe negligence of livestock farmers regarding waste disposal and inadequate waste control facilities are becoming a serious health and environmental hazard. In this study, a charcoal-fuelled dryer was developed to eliminate the moisture content in hog waste for easy conversion... -
Adoption of agrochemical management practices among smallholder cocoa farmers in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Gideon Danso-Abbeam --- SAEES – Discipline of Agricultural Economics, South Africa Lloyd J. S. Baiyegunhi --- SAEES – Discipline of Agricultural Economics, South AfricaThis study explores smallholder cocoa farmers’ adoption decisions of agrochemical inputs in the Ghanaian cocoa industry using farm-level data collected from a sample of 838 farm households in four cocoa producing regions. Multivariate probit and Tobit models were used to... -
Adoption of organic fertilizer for cocoa production in Ghana: Perceptions and determinants
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Anthoinette Avane --- , Ghana Bismark Amfo --- , Ghana Robert Aidoo --- , Ghana James Osei Mensah --- , GhanaThis study assesses perceptions, determinants, and constraints of ‘Asaasenufosuo’ organic fertilizer adoption by cocoa farmers in Ghana. Primary data were sourced from 200 cocoa farmers. Perception index, Cragg’s double hurdle model, and Kendall’s coefficient of concordance were employed. In addition... -
Phosphorus and nitrogen fertiliser effects on anion-exchange-resin phosphorus and sugarcane yield in Plinthic soils of KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sandile Siphesihle Mthimkhulu --- Mangosuthu University of Technology, South Africa Sizwe Vincent Mbona --- Durban University of Technology, South AfricaEfficient phosphorus (P) extraction methods are vital for optimising sugarcane production, yet no single chemical extractant currently suits the diverse soil conditions across South Africa’s sugarcane regions. This study explored the potential of anion-exchange-resin phosphorus (AER-P) as a possible alternative...