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1. Determining sample size for assessing species composition in grassland¹

   Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: M.B. Hardy --- Department of Agricultural Development, Republic of South Africa R.S. Walker --- Department of Grassland Science, Republic of South Africa

   Species composition is measured in grasslands for a variety of reasons. Commonly, observations are made using the wheel‐point apparatus. However, the problem of determining optimum sample size has not yet been satisfactorily resolved. In this study the wheel‐point apparatus was...

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2. 

   Apparatus for non-destructive measurement of grapevine trunk cross-sectional area

   Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.A. Myburgh --- , South Africa F. Coetzee --- , South Africa

   Measuring sap flow in grapevine trunks, using the heat pulse velocity technique, requires accurate, non-destructive measurement of trunk cross-sectional areas. A profile measuring apparatus (PMA) was constructed to improve the accuracy of these measurements, particularly for irregular cross-sections. The low-cost...

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3. 

   Development of monitoring procedures for the herbaceous layer on the Northeastern Transvaal escarpment

   Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M. Stalmans --- Resource Ecology Group, Department of Botany, Republic of South Africa M.T. Mentis --- Resource Ecology Group, Department of Botany, Republic of South Africa

   A step‐wise approach was followed towards the design of a monitoring system for the herbaceous layer on the escarpment of the Drakensberg mountains in the Transvaal, South Africa. The parameter of concern was proportional species composition. In a first phase,...

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