Articles by Keyword: Vigour

Search results for Vigour

We found 14 results for you
  1. 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
    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...
  2. Influence of sub-optimal imbibition temperatures on seed vigour and respiration in maize (<em>Zea mays</em> L.)

    Influence of sub-optimal imbibition temperatures on seed vigour and respiration in maize (<em>Zea mays</em> L.)

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    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...
  3. Germination rate of maize (<em>Zea mays</em> L.) kernels. I. Relationships with kernel properties and water uptake

    Germination rate of maize (<em>Zea mays</em> L.) kernels. I. Relationships with kernel properties and water uptake

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Relationships 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...
  4. Germination rate of maize (<em>Zea mays</em> L.) kernels. II. Relationships with respiration rate and adenosine triphosphate content

    Germination rate of maize (<em>Zea mays</em> L.) kernels. II. Relationships with respiration rate and adenosine triphosphate content

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Germination 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...
  5. Reaction of three veld grasses to different schedules of grazing and resting. 2. Residual effects on vigour

    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
    Seven 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...
  6. A comparison of seed vigour tests for maize (<em>Zea mays</em> L.)

    A comparison of seed vigour tests for maize (<em>Zea mays</em> L.)

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A 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...
  7. The effect of a diurnal period of supra-optimal temperature on the seed vigour of sunflower

    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
    The 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...
  8. The response of germinating sunflower seed to heat tolerance induction

    The response of germinating sunflower seed to heat tolerance induction

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Vigour 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...
  9. Effect of chemical seed treatment on the germination and seedling vigour of canola (<em>Brassica napus</em> var. <em>oleifera</em>)

    Effect of chemical seed treatment on the germination and seedling vigour of canola (<em>Brassica napus</em> var. <em>oleifera</em>)

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Incubation 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...
  10. Plant and sward response to patch grazing in the Highland Sourveld

    Plant and sward response to patch grazing in the Highland Sourveld

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Selective 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...