Articles by Author: J O Grunow

Search results for J O Grunow

We found 25 results for you
  1. The developing fields of plant ecology

    The developing fields of plant ecology

    Ecology embraces the study of the structure and function of eco‐systems. Seven fields of ecology may be distinguished viz. systems, production, phytosociological and physiological ecology, and aut‐, gen‐ and paleoecology. A review is given of the objects and main investigational...
  2. Vegetation ordination and classification: Practical implications

    Vegetation ordination and classification: Practical implications

    The main role of vegetation classification in agricultural land utilization is for the planning and management of vegetated areas. For farm planning, rapid, observationally‐based methods are most practical, but for planning at all scales the slower quantitative methods eliminate personal...
  3. Long term nitrogen application to veld in South Africa

    Long term nitrogen application to veld in South Africa

    The most important results of thirteen fertilizer experiments on veld, extending over periods of five to twenty years, are dealt with. In general, with nitrogen fertilization climax grasses were replaced by grasses of a more pioneer type. Of the nitrogenous...
  4. Voedings‐ en produksiestudies op <em>Cenchrus ciliaris L</em>. cv. Molopo<sup>1</sup>

    Voedings‐ en produksiestudies op <em>Cenchrus ciliaris L</em>. cv. Molopo<sup>1</sup>

    Die waarskynlike optimum makrovoedingselementpeile vir Cenchrus ciliaris cv. Molopo, in dpm, deur middel van sandkultuurstudies bepaal, is: N‐140, P‐31, K‐130, S‐6, Ca‐20 en Mg‐5. Die cultivar is die gevoeligste vir tekorte aan N, P, K en S. Hoë Ca‐ (600...
  5. Produksie‐ en morfologiese reaksie op ontblaring van <em>Cenchrus ciliaris L</em>
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    Produksie‐ en morfologiese reaksie op ontblaring van <em>Cenchrus ciliaris L</em> <sup>1</sup>

    Die produksie‐ en morfologiese reaksie van Cenchrus ciliaris cv. Molopo is, oor ‘n periode van een jaar, onder glashuistoestande bestudeer. Die resultate dui op ‘n groot buigbaarheid in die benuttingsprogram van die gras. Ten opsigte van wortelmassa skyn frekwensie van...
  6. Standing crop dry matter accumulation and quality patterns of certain subtropical pasture species

    Standing crop dry matter accumulation and quality patterns of certain subtropical pasture species

    Nine‐week production curves and quality values of eight subtropical pasture species were studied under supplemental spray irrigation to characterize their productive capacity, periodicity and quality.
  7. Dry matter production curves of Ariki ryegrass pastures at Pretoria

    Dry matter production curves of Ariki ryegrass pastures at Pretoria

    Irrigated Ariki ryegrass produced 13,7 and 9,2 m t/ha green dry matter during the first and second growing seasons respectively. It was most productive in spring, because the growth rate decreased throughout the growing season. This necessitated increasingly long periods...