Articles by Author: Bertha Spies

Search results for Bertha Spies

We found 15 results for you
  1. Facilitating access to atonal music: Ligeti's second string quartet

    Facilitating access to atonal music: Ligeti's second string quartet

    Item type: Journal Article • Journal: Journal of the Musical Arts in Africa
    Atonal music is generally perceived as opaque and difficult to understand because it rarely makes aural sense to the uninitiated listener. A method is proposed to assist teaching and learning in this field. It links up with the mathematical Fibonacci...
  2. Peter Klatzow’s <em>Words from a Broken String</em>: two cultures meet in the distant past

    Peter Klatzow’s <em>Words from a Broken String</em>: two cultures meet in the distant past

    Item type: Journal Article • Journal: Journal of the Musical Arts in Africa
    Peter Klatzow’s short opera focuses on the figure of the English woman, Lucy Lloyd, in his portrayal of the interaction between the Victorian and ‘Bushman’ cultures in Southern Africa in the late 19th century. Apart from concentrating on Klatzow’s use...
  3. Variation in important pasture grasses: I. Morphological and geographical variation

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Seven species are important pasture grasses throughout the western Transvaal, Orange Free State, northern Cape and Natal. Taxonomically, each is a widely distributed species complex with a range of morphological variants and many ecotypes. The local forms well suited to...
  4. Variation in important pasture grasses. II. Cytogenetic and reproductive variation

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The chromosome numbers and reproductive variation of seven important pasture grasses from South Africa are compared. This comparison indicates that all these species form polyploid complexes, all reproduce both sexually and either apomictically or vegetatively, and some form of hybridization...
  5. Sterile <em>Lanterna camara:</em> fact or theory

    Sterile <em>Lanterna camara:</em> fact or theory

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Attempts are being made to legalize the sale of ‘sterile’ Lantana camara varieties in South Africa. Several so-called sterile varieties have been investigated cytogenetically. All these. plants proved to be triploids.(2n = 33). A mechanism exists through which an unexpectedly...
  6. Assessment of macroscopic components of leaf rust resistance in wheat genotypes containing <em>Lr12</em> and <em>Lr13</em>

    Assessment of macroscopic components of leaf rust resistance in wheat genotypes containing <em>Lr12</em> and <em>Lr13</em>

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Monogenic resistance in wheat (Triticum aestivum L.) to leaf rust, caused by Puccinia recondita Rob. ex. Desm. f. sp. tritici, has generally not been durable. Durable resistance, as well as an improved expression of resistance, have been associated with Lr...
  7. Response of <em>Lachenalia</em> growing in soil to nitrogen fertilization during the nursery phase

    Response of <em>Lachenalia</em> growing in soil to nitrogen fertilization during the nursery phase

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    During the nursery phase, Lachenalia flower bulb producers plant bulblets propagated from leaf cuttings, for enlargement. They strive for a high yield of good quality bulbs that are of a marketable size within a year. In this regard nitrogen is...
  8. Response of <em>Lachenalia</em> growing in soil to nitrogen fertilisation during the pot plant phase

    Response of <em>Lachenalia</em> growing in soil to nitrogen fertilisation during the pot plant phase

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Lachenalia bulbs used in the pot plant industry are produced in the nursery phase from bulblets propagated from leaf cuttings. Fertilisation during this phase of enlargement can ultimately influence the growth and flowering of pot plants through the nutritional status...
  9. Response of <em>Lachenalia</em> growing in soil to interactions between nitrogen and phosphorus fertilisation in the nursery phase

    Response of <em>Lachenalia</em> growing in soil to interactions between nitrogen and phosphorus fertilisation in the nursery phase

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The interactions between nutrients required by plants play an important role in sustainable crop production. Both nitrogen and phosphorus are involved in a number of important functions in the plant such as carbohydrate and protein formation. The need to investigate...