Search
Search results for
We found
16 results for you
-
Veld condition in the south‐eastern Transvaal and its effect on grazing capacity
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N F G Rethman --- Department of Agriculture and Water Supply (Transvaal Region), G D Kotzé --- Department of Agriculture and Water Supply (Transvaal Region),A survey conducted on sites throughout the south‐eastern Transvaal, representing 1,4 million hectares of natural veld has confirmed the parlous state of composition, cover and vigour. The implications which these conditions hold, not only for conservation of soil and water... -
Influence of sub-optimal imbibition temperatures on seed vigour and respiration in maize (Zea mays L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.A. van de Venter --- , N. Grobbelaar --- ,Germination and coleoptile growth of nine seed lots of maize (representing seven cultivars) were studied at 25°C (constant), 13°C (constant) and also at 7°C (7 days) followed by 25°C. Relative germination response to sub-optimal temperatures reflected relative differences in germination... -
Germination rate of maize (Zea mays L.) kernels. I. Relationships with kernel properties and water uptake
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.A. van de Venter --- , Republic of South Africa Rentia Hoffman --- , Republic of South AfricaRelationships were sought between germination rate and various kernel variables of 12 freshly harvested, undeteriorated seed lots of maize. Germination rate was positively correlated with water content of kernels at all sampling times up to 30 h of incubation and... -
Germination rate of maize (Zea mays L.) kernels. II. Relationships with respiration rate and adenosine triphosphate content
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.A. van de Venter --- , Republic of South Africa Rentia Hoffman --- , Republic of South Africa S. de Meillon --- , Republic of South AfricaGermination rate of freshly harvested, undeteriorated seed lots of maize was found to be positively correlated with rate of oxygen uptake of kernels and adenosine triphosphate (ATP) content of embryos, at 6 and 12 h of incubation. Respiration rate was... -
Reaction of three veld grasses to different schedules of grazing and resting. 2. Residual effects on vigour
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.L. Barnes --- Department of Agriculture and Water Supply, Republic of South AfricaSeven defoliation treatments involving grazing at intervals with sheep until mid-January or mid-March, or for the whole growing season at each of two stocking intensities, or resting for the whole growing season (control treatment) were applied on veld during the... -
A comparison of seed vigour tests for maize (Zea mays L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.A. van de Venter --- , Republic of South Africa H.W. Lock --- , Republic of South AfricaA number of seed vigour tests were conducted on two groups of maize seed lots. One group consisted of six seed lots of different cultivars while the other group consisted of six sub-lots of one cultivar, artificially aged for different... -
The effect of a diurnal period of supra-optimal temperature on the seed vigour of sunflower
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Nel --- , Republic of South AfricaThe daily maximum temperature in the upper 20 mm of sandy soils is often higher than 45°C on cloudless days during November, December and January in the summer rainfall region of South Africa. At these supra-optimal temperatures, sunflower seedling vigour... -
The response of germinating sunflower seed to heat tolerance induction
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Nel --- , Republic of South AfricaVigour of pre-emergent sunflower (Helianthus annuus L.) seedlings is reduced when daily peak soil temperatures exceed 44°C resulting in poor emergence. Seedlings of sorghum (Sorghum bicolor L. Moench) are known to acquire thermotolerance to temperatures of 45–50°C as a consequence... -
Effect of chemical seed treatment on the germination and seedling vigour of canola (Brassica napus var. oleifera)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. de Villiers --- Department of Agronomy, South Africa G.A. Agenbag --- Department of Agronomy, South Africa S.C. Lamprecht --- , South AfricaIncubation studies were conducted to determine effects of two chemical seed treatments (Cruiser & SA-combination) on the germination and seedling vigour of canola (cv. Varola 44) seed. Germination percentages of the Cruiser and SA-combination treated seeds were not significantly reduced... -
Plant and sward response to patch grazing in the Highland Sourveld
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: B.U. Lütge --- Department of Grassland Science, Republic of South Africa M.B. Hardy --- KwaZulu‐Natal Department of Agriculture, Republic of South Africa G.P. Hatch --- Department of Grassland Science, Republic of South AfricaSelective grazing by livestock inevitably results in patch grazing. This study was initiated to determine the effects of patch grazing on (1) the vigour of a single grass species, Themeda triandra, and of the sward, and (2) sward species composition... -
Work Related Well-Being: Burnout, Work Engagement, Occupational Stress and Job Satisfaction Within a Medical Laboratory Setting
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Kalashni Narainsamy --- University of South Africa, Sanet Van Der Westhuizen --- University of South Africa,This study investigated work-related well-being in a medical laboratory setting. A cross-sectional survey design was used to gather data from a convenience sample of 202 medical laboratory staff (females = 35.64%; majority ethnicity = Indian). Participants completed the Burnout Inventory—General... -
Vermicompost leachate improves seedling emergence and vigour of aged seeds of commercially grown Eucalyptus species
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: LS Kandari --- Research Centre for Plant Growth and Development, School of Biological and Conservation Sciences, South Africa MG Kulkarni --- Research Centre for Plant Growth and Development, School of Biological and Conservation Sciences, South Africa J van Staden --- Research Centre for Plant Growth and Development, School of Biological and Conservation Sciences, South AfricaVermicompost leachate (VCL) is a liquid generated by earthworms and microorganisms during the conversion of organic matter into vermicompost. Vermicompost leachate is rich in nutrients and believed to contain both known and unknown plant growth substances, which are beneficial to... -
Genetic diversity of maize germplasm lines and implications for breeding Maize streak virus resistant hybrids
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Nothando Mafu --- Plant Pathology, School of Agricultural, Earth and Environmental Sciences, South Africa Roobavathie Naidoo --- Plant Pathology, School of Agricultural, Earth and Environmental Sciences, South Africa Pedro Fato --- African Centre of Crop Improvement, School of Agricultural, Earth and Environmental Sciences, South Africa Jedidah Danson --- African Centre of Crop Improvement, School of Agricultural, Earth and Environmental Sciences, South Africa John Derera --- African Centre of Crop Improvement, School of Agricultural, Earth and Environmental Sciences, South Africa Mark D Laing --- Plant Pathology, School of Agricultural, Earth and Environmental Sciences, South AfricaEvaluation of genetic distances between maize inbred lines can be used to maximise heterosis in hybrids. This study was conducted to determine genetic distances among 25 maize inbred lines in the Maize streak virus disease (MSVD) QTL region to develop... -
Seed quality characteristics of a bambara groundnut (Vigna subterranea L.) landrace differing in seed coat colour
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tendai P Chibarabada --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Albert T Modi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Tafadzwanashe Mabhaudhi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South AfricaBambara groundnut (Vigna subterranea L.) is an underutilised African legume that fits the same ecological niche as Arachis hypogea. It is still cultivated using landraces and little is known about their seed quality. The current study evaluated seed quality characteristics... -
Contrasting effects of soil pH on seed germination and early seedling growth of Calobota sericea and Lessertia frutescens subs. frutescens
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Francuois L Müller --- ,This study evaluated the impacts of pH on the germination and early seedling growth of Calobota sericea and Lessertia frutescens subsp. frutescens, two perennial legume species found in the semi-arid rangelands of South Africa. The results of this study revealed... -
Call centre support staff job crafting and employee engagement: Controlling the effects of sociodemographic characteristics
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Dudu Mkhwanazi --- University of Johannesburg, South Africa Nelesh Dhanpat --- University of Johannesburg, South AfricaThe study explored job crafting (task, cognitive, and relational crafting) and work engagement (vigour, absorption, and dedication) among support staff within a financial services call centre in the Gauteng province, South Africa. The participants (n = 213; female = 54.9%;...