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Stimulation of Bud Production in Eucalyptus globulus by Paclobutrazol Application
Item type: Journal Article • Journal: South African Forestry Journal • Authors: S. Hetherington --- , K.M. Jones --- Department of Primary Industries New Town Research Laboratories, Australia T.B. Koen --- Department of Primary Industries New Town Research Laboratories, AustraliaTrunk injection of paclobutrazol (Clipper) significantly increased the bud crop on 7-year-old Eucalyptus globulus (Labill.) seed orchard trees, within one year of application. This is the first reported stimulation of reproduction to occur, with eucalypts, in the season of application... -
Growth patterns of Italian ryegrass cultivars established in different seasons
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: D.C.W. Goodenough --- Department of Agriculture (Natal Region), C.I. Macdonald --- Department of Agriculture (Natal Region), A.R.J. Morrison --- Department of Agriculture (Natal Region),A comparison is made between various Italian ryegrass cultivars established under irrigation on a well‐drained upland site during the traditional autumn months, with plantings of the same cultivars at other times of the year. -
The influence of nitrogen fertilization, spring burning and height of stubble on hay and seed production of eragrostis curvula 1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N.F.G. Rethman --- Department of Plant Production, B.H. Beukes --- Department of Agriculture & Water Supply,This investigation, conducted over a three‐year period, emphasized the strong effect of nitrogen fertilization on both hay and seed production. The optimum level of nitrogen, for conditions on the Eastern Highveld being 100–150 kg N/ha applied in spring, followed by... -
Forage potential of Japanese radish (Raphanus sativus) as influenced by planting date and cultivar choice
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: A. Verschoor --- Division of Grassland Science, Department of Plant Production, Republic of South Africa N.F.G. Rethman --- Division of Grassland Science, Department of Plant Production, Republic of South AfricaJapanese radish shows potential as a winter forage. If planted early (Dec/Jan.), high temperatures can damage seedlings. With late plantings (Mar./Apr.), the growing season can become a limiting factor. A study to establish the optimum planting date for warmer areas... -
Influence of temperature and daylength on the phenological development of annual Medicago species with particular reference to M. truncatula, cv. Jemalong
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.M. van Heerden --- Department of Agriculture,In a glasshouse and two growth-room trials, carried out in conjunction with 12 serial plantings in pots in the open, it was found that the phenological development of Medicago truncatula, M. tornata, M. aculeata, M. polymorpha, M. scutellata and M... -
The influence of photoperiod and temperature on the pre-flowering phase length of eleven soybean cultivars in northern Natal
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Chapman --- Agricultural Research Station,The effect of photoperiod and temperature on the pre-flowering phase length of 11 soybean cultivars was studied. Heat units (10 to 30°C) and night hours (sunset to sunrise) were used as measures of temperature and photoperiod respectively. Highly significant negative... -
Effect of a foliar application of paclobutrazol in autumn on the reproductive development of ‘Songold’ plum
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O.J. Olivier --- Department of Horticultural Science, Republic of South Africa G. Jacobs --- Department of Horticultural Science, Republic of South Africa D.K. Strydom --- Department of Horticultural Science, Republic of South AfricaA foliar application of paclobutrazol (1- (4-chlorophenyl) −4,4-dimethyl-2- (1,2,4- triazol-1-yl) pentan-3-ol) at 250 or 500 mg dm−3 a.i. in autumn, or late winter applications of dinitro-o-cresol oil emulsion (DNOC) in water at 3% v/v, increased the percentage of ‘Songold’ plum... -
Bepaling van optimale blom en plantdatums vir koring in die sentrale besproeiingsgebiede van die RSA met behulp van 'n groeimodel
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Singels --- Departement Landbouweerkunde, Republiek van Suid-AfrikaOptimale blom- en plantperiodes vir besproeiingskoring is bepaal vir 15 lokaliteite in die sentrale besproeiingsgebiede van die RSA deur gebruik te maak van historiese temperatuurdata en die PUTU koringgroeimodel. Die hoogste gemiddelde opbrengs is gesimuleer met blomperiodes wat oor die... -
Low temperature treatment advances flowering in Clivia miniata (Lindley) Regel
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.B. Honiball --- Department of Plant Production and Soil Science, P.J. Robbertse --- Department of Plant Production and Soil Science,Clivia miniata plants were exposed to a cold treatment of 7.5–10 °C for 14 days in the dark from 24 April 2000. Compared to the non-cold treated control plants, the cold-treated plants started flowering four weeks earlier resulting in 80%... -
Potassium nitrate and urea sprays affect flowering and yields of ‘Tommy Atkins’ (Mangifera indica) mango in Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T. Yeshitela --- Department of Plant Production and Soil Sciences, South Africa P.J. Robbertse --- Department of Plant Production and Soil Sciences, South Africa P. J.C. Stassen --- Department of Horticulture, South AfricaThe effects of leaf applications of potassium nitrate (KNO3), alone and in combination with urea at different concentrations on flowering, fruit set and fruit quality of Tommy Atkins' mango grown in the rift valley of Ethiopia were evaluated. The trees... -
The effect of MCPA and paclobutrazol on flowering, berry set, biomass production, tuber yield and quality of potato
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T. Tekalign --- Department of Plant Production and Soil Science, South Africa P.S. Hammes --- Department of Plant Production and Soil Science, South AfricaThe effects of MCPA and paclobutrazol on potato (Solanum tuberosum L.) flowering, berry formation, dry matter production and allocation, tuber yield and quality were investigated under greenhouse and field conditions at the Experimental Farm of the University of Pretoria. Both... -
Evaluation of electrical conductivity of the fertiliser solution on growth and flowering of a Cymbidium hybrid
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: SK Naik --- , India D Barman --- , India Rampal --- , India RP Medhi --- , IndiaThe effects of three fertiliser solutions (20:20:20, 15:5:25 and 12:30:10 NPK) with electrical conductivity (EC) of 1, 1.5 or 2 mS cm−1 on growth and flowering of Cymbidium ‘Sleeping Nymph’ were investigated over three years. One-year-old tissue-cultured propagules of ‘Sleeping... -
Research note: Vernalization requirements of Lolium multiflorum Lam. cv. Tetrone
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: A. Landman --- Agricultural Research Council, Republic of South Africa P.J. Robbertse --- Department of Botany, Republic of South Africa A. Smith --- Agricultural Research Council, Republic of South AfricaThis study was undertaken mainly to attempt to understand why Italian type plants of Lolium multiflorum Lam. (Italian ryegrass) fail to become vernalized in certain climatic regions of South Africa. The vernalization requirements of seed and plants for the induction... -
A tool for identifying potential Eucalyptus nitens seed orchard sites based on climate and topography
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ilaria Germishuizen --- Institute for Commercial Forestry Research, South Africa Robin AW Gardner --- Institute for Commercial Forestry Research, South AfricaShy seed production in orchards of Eucalyptus nitens is a major barrier to the deployment of genetic gain in South African plantations. A machine learning method was used to identify optimal sites for the establishment of E. nitens seed orchards... -
Monitoring eucalypt bud temperature using mobile temperature loggers
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Robin AW Gardner --- Institute for Commercial Forestry Research, South Africa Michael J Savage --- Agrometeorology Discipline, School of Agricultural, Earth and Environmental Sciences, South Africa Isa Bertling --- Horticultural Science Discipline, School of Agricultural, Earth and Environmental Sciences, South AfricaWinter chilling is a key environmental trigger of floral induction in temperate Eucalyptus. Over the past two decades, considerable site × eucalypt flowering interaction research has been undertaken over a range of high elevation (>1 100 m asl) forestry sites in... -
Growth and phenology of a three- to four-year-old Sclerocarya birrea international provenance trial in Malawi
Item type: Journal Article • Journal: Southern Hemisphere Forestry Journal • Authors: PW Chirwa RJ Bwanali G Meke W Sagona CRY Munthali L MwabumbaIndigenous wild fruits of Sclerocarya birrea have been used to supplement diets in time of critical food shortage, generate income when sold and as a source of raw materials for natural food-based industries in many developing countries. However, the widespread... -
Morpho-agronomical characterisation of local and international sweetpotato germplasm from the South African collection
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sonia IM Naidoo --- , South Africa Sunette M Laurie --- , South Africa Hussein Shimelis --- , South Africa Mark D Laing --- , South AfricaConsiderable genetic diversity is present amongst the sweet potato (Ipomoea batatas (L.) Lam.) accessions that can be selected for breeding. The Agricultural Research Council of South Africa maintains 360 sweetpotato accessions that were bred locally, and introductions from various regions...