Articles by Keyword: Temperature

Search results for Temperature

We found 139 results for you
  1. The Influence of Site Factors on the Foliar Nutrient Content of <em>Eucalyptus grandis</em> in Natal

    Item type: Journal Article • Journal: South African Forestry Journal
    Although foliar analysis is commonly used to diagnose the nutritional status of trees and their ability to respond to fertilising, it is also a measure of site type and quality. The availability of nutrients in the soil varies with climatic...
  2. Effects of seed treatments on the germination of <em>Atriplex nummularia</em> Lindl.

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Laboratory experiments were conducted to determine the influence of length of soaking period and water temperature treatments on the germination of Atriplex nummularia. Germination percentages increased significantly (P≤0,01) with increasing soaking period in water with a temperature of 20°C, while...
  3. Epidemiology of ryegrass mosaic virus in South Africa

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The distribution and seasonal occurrence of ryegrass mosaic virus (RMV) in South Africa was determined. Italian ryegrass plants were collected from eight different research stations twice during the growing season in 1990 and 1991. Samples were tested for the presence...
  4. Die rol van sekere omgewingsfaktore by alachloraktiwiteit

    Die rol van sekere omgewingsfaktore by alachloraktiwiteit

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Biotoetse met graansorghum (Sorghum bicolor L.) is in potte in glashuise en groeikabinette uitgevoer. Geselekteerde grond- eienskappe is gekorreleer met alachloraktiwiteit. Organiese materiaalinhoud (% C) was die beste gekorreleerd met die aktiwiteit van alachlor en pH die swakste. Die r-waardes...
  5. Influence of temperature and daylength on the phenological development of annual <em>Medicago</em> species with particular reference to <em>M. truncatula</em>, cv. Jemalong

    Influence of temperature and daylength on the phenological development of annual <em>Medicago</em> species with particular reference to <em>M. truncatula</em>, cv. Jemalong

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    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...
  6. Potato irrigation scheduling and straw mulching

    Potato irrigation scheduling and straw mulching

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The effect of mulching and irrigation frequency on tuber yield was investigated during three seasons at the Glen Agricultural Research Institute The soil on the experimental site consisted of a loamy sand topsoil and sandy clay subsoil with 94 mm...
  7. Estimation of minimum temperature on a mesoscale

    Estimation of minimum temperature on a mesoscale

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Working relationships between mean minimum temperatures and environmental factors by means of regression techniques were established and used to estimate temperatures at gridpoints. These estimated temperatures were then used with a computer package program to map the isotherms on a...
  8. 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...
  9. Canopy temperature as a plant water stress indicator for nectarines

    Canopy temperature as a plant water stress indicator for nectarines

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Three-year-old nectarine trees of the cultivar Independence grown in free-drainage lysimeters were exposed to a wet and a dry treatment, i.e. high soil moisture content throughout or progressive soil drying respectively. The canopy temperature of the trees was measured with...
  10. <em>In vivo</em> atrazine hydroxylation in maize plants exposed to five different temperature regimes

    <em>In vivo</em> atrazine hydroxylation in maize plants exposed to five different temperature regimes

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Maize plants exposed to atrazine at temperatures ranging from 10°C to 30°C showed increased hydroxylation of atrazine to form the non-toxic hydroxy-atrazine metabolite as temperature increased to 25°C, above which hydroxylation decreased again. When exposed to 12 ppm atrazine, accumulation...