Now showing items 1-20 of 232

    • Die transpirasie van 'n aantal Karoobossoorte 

      Du Preez, Charles Matthias Rowe (University of the Free State, 1964-12)
      Afrikaans: Die Karoobossies speel 'n belangrike rol as dierevoedsel in die Karoogebied en tree ook op as indringerplante na die noorde en die ooste. Aangesien hierdie unieke dwergstruike meesalonder droogtetoestande groei ...
    • 'n Morfologiese studie van die genus Acacia Miller in Suid-Afrika 

      Robbertse, Petrus Johannes (University of the Free State, 1971-07)
      English: The genus Acacia is an extensive one with representatives in Africa, America, Asia and Australia. When Bentham revised the subfamily Mimosoideae in 1875 he divided the taxon into six subgenera. All the South ...
    • Studies on the survival of Verticillium dahliae in soil 

      Baard, Schalk Willem (University of the Free State, 1979-12)
      Various aspects concerning the survival of Verticillium dahliae Kleb. in soil, in the field, green-house, and laboratory were studied. 'With biological control in mind, attention was paid to factors affecting antagonists ...
    • Die plantekologie van die Waterberg Platopark 

      Jankowitz, Willem Jacobus (University of the Free State, 1983-03)
      English: The object of this study is to provide a foundation for management based on sound scientific procedures. To classify the vegetation into different homogenous plant communities, the wellknown Braun-Blanquet-technique ...
    • Ultrastruktuur en konidiogenese in Fusarium crookwellense 

      Venter, Elrita (University of the Free State, 1986-11)
      Afrikaans: Die ultrastruktuur, sporulasie en sitologie van Fusarium spp. het wye aandag geniet, maar sekere basiese inligting hieromtrent is nie beskikbaar nie. Tydens die huidige bestudering van die toetsorganisme, ...
    • Plantsosiologie van die Bloemfontein-Wes-Distrik 

      Malan, Pieter Willem (University of the Free State, 1992-11)
      English: The aim of this study was to identify, characterize and interpret, ecologically, by using hahitat properties, the major vegetation units and their variations. The study area covers approximately 350 000 hectares. ...
    • The expression of leaf rust resistance in wheat lines containing Lr12 and Lr13 

      Bender, Cornelia Magrietha (University of the Free State, 1995-11-30)
      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. One strategy of attaining durable resistance to rust diseases ...
    • Inheritance of yield and quality characteristics in processing tomatoes 

      Blokpoel, Ian Hendrik Christiaan (University of the Free State, 1998-09)
      English: The main objective of this study was to determine the combining ability of several tomato genotypes, the heritability of various yield and quality characteristics and the expression of heterosis in the F1 ...
    • Water quality of the Modder River 

      Koning, Nadene (University of the Free State, 1998-11)
      English: The Modder River is a relatively small river which drains an area of 7 960 km² , in the central region of the Free State Province, South Africa and has a mean annual runoff of 184 x 10⁶ m³ . Botshabelo is a city ...
    • Genetic variability for yield and quality characteristics in South African cotton germplasm (Gossypium hirsutum L.) 

      Emeetai-Areke, Thomas Edison (University of the Free State, 1999)
      English: The objective of this research was to study the genetic variability in South African cotton germplasm and to identify superior parental lines for the improvement of yield and quality characteristics. 2 Six ...
    • Micropropagation of Pinus species 

      Jacoby, Angeline (University of the Free State, 1999)
      English: The aim of this study was to develop an effective protocol for the micropropagation of Pinus patuIa and P. radiata. Micropropagation procedures by means of somatic embryogenesis on solidified medium and in cell ...
    • Adult-plant resistance to Puccinia recondita f. sp. tritici in a collection of wild Triticum species 

      Barnard, Johanna Elizabeth (University of the Free State, 1999-05)
      English: The ability of rust pathogens to mutate and form new and virulent races, necessitates the broadening of the genetic base of resistance in common wheat to rust diseases. The wild relatives offer a rich reservoir ...
    • A phylogenetic study of some representatives of the genus Pentaschistis 

      Holder, Francisca (University of the Free State, 1999-05)
      English: The genus Pentaschistis (Nees) Spach consists of 68 species and is endemic to Africa, with 57 species being indigenous to South Africa and 40 species endemic (Gibbs RusseIl et al. 1990). To date, the chromosome ...
    • A phylogenetic study of some South African representatives of the tribe Arundineae 

      Roodt, Rouvay (University of the Free State, 1999-05)
      English: This study dealt with the phylogenetic history of some representatives of the South African Arundineae. Arundineae Durnort. is one of the tribes in the grass (Poaceae) subfamily Arundinoideae Tateoka. This is ...
    • Fusarium dry rot of potatoes: etiology, epidemiology, toxicity and control 

      Theron, Daniël Jacobus (University of the Free State, 1999-05)
      English: Eighteen Fusarium species were isolated from dry- and stem-end-rotted potato tubers in South Africa. Samples with dry-rot lesions were easily obtained, even though samples were taken directly after harvest and ...
    • Grain yield and breadmaking quality of wheat lines with leaf rust resistance genes Lr29, Lr34, Lr35, and Lr37 

      Grobbelaar, Benida (University of the Free State, 1999-06)
      English: 1. The aim of this study was to determine if the leaf rust resistance genes Lr2g, Lr34, Lr35 and Lr37 have an effect on the quality and yield characteristics of a cultivar it is incorporated into. 2. Near-isogenic ...
    • An assessment of endophytic fungi in needles of three pinus spp. cultivated in South Africa 

      Kriel, Wilma-Marie (University of the Free State, 1999-11)
      English: Endophytes, in the strict sense, are organisms that cause symptom less infections in plants. As symptomless mutualists, they can act as biocontrol agents of herbivorous insects and plant diseases. They can also ...
    • 'n Ondersoek na die antibakteriese eienskappe van Carpobrotus edulis L. 

      Van der Watt, Elmarie (University of the Free State, 1999-11)
      English: In the folk medicine of South Africa, many traditional medicinal plants are used by both the rural and a small percentage of the city population. One of these plants is Carpobrotus edulis L. An investigation of ...
    • Identification of genetic distances and heterotic groups of inbred maize (Zea mays) lines using DNA fingerprinting 

      Swanepoel, Ezanne (University of the Free State, 1999-12)
      English: AFLP (Amplified Fragment Length Polymorphism) analysis has found widespread use in DNA fingerprinting because of its relative simplicity, low cost and high marker output. AFLP analysis also does not have the ...
    • Inheritance of agronomic and quality characteristics in sweet potato (Ipomoea batatas (L.) Lam.) 

      Kanju, Edward Eneah (University of the Free State, 2000-03)
      English: 1. The study was undertaken to estimate genetic parameters like variance components, general and specific combining ability effects, phenotypic and genetic correlation coefficients, heritability coefficients, ...