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Now showing items 1-20 of 2161

A bacterial population structure study of water cooling systems in South Africa

Cloete, T.E. (Thomas Eugene), 1958-; Brözel, V.S. (Volker Siegfried), 1963-; Pressly, J. (Water Research Council, 1989-01)

Bacteria forming biofilms occur in all open water cooling systems where they accelerate metallic corrosion, reduce flow rate and decrease heat energy transfer rate. A population structure study of seven systems was conducted. ...
The economic impact of irrigation agriculture: methodological aspects and an empirical application

Kirsten, Johann F.; Van Zyl, Johan (Routledge, 1990-05)

This article considers the regional economic impact of irrigation development by means of a case study. Theoretical aspects of irrigation development are discussed, followed by a brief overview of methodological alternatives ...
Metodologiese alternatiewe vir die bepaling van die ekonomiese impak van besproeiingslandbou

Kirsten, Johann F.; Van Zyl, Johan (Agricultural Economics Association of South Africa, 1990-06)

'n Oorsig oor die verskillende metodologiese alternatiewe beskikbaar vir 'n impakstudie word gegee. Die ekonomiese basisstudie, inset-uitsetmodelle, ekonometriese modelle, wiskundige programmeringsmetodes en die vergelyking ...
Ekonomiese impak van besproeiingslandbou in die Suidwes-Vrystaat - 'n toepassing van streeksinset-uitsettabelle

Kirsten, Johann F.; Van Zyl, Johan (Agricultural Economics Association of South Africa, 1990-09)

In hierdie artikel word streeksinset-uitsettabelle gebruik om die ekonomiese impak van besproeiingslandbou deur middel van 'n gevallestudie te bepaal. Die wyse waarop streeksinset-uitsettabelle saamgestel word, word bespreek. ...
Fingerprinting of commercially available water treatment bactericides in South Africa

Brözel, V.S. (Volker Siegfried), 1963-; Cloete, T.E. (Thomas Eugene), 1958- (Water Research Council, 1991-01)

Eighteen dominant isolates from water-cooling systems were exposed to 50mg/l of commercially available bactericides, and the kill percentage was determined after 6 h. Application costs of all bactericides giving an average ...
Effect of storage time and temperature on the aerobic plate count and on the community structure of two water samples

Brözel, V.S. (Volker Siegfried), 1963-; Cloete, T.E. (Thomas Eugene), 1958- (Water Research Council, 1991-10)

The effect of storage at various temperatures on the bacterial community of a cooling-water sample and a tap-water sample was determined. Samples were stored at 4, 10, 20 and 30 degrees C for 24, 48, 72 and 216 h and the ...
The effect of bactericide treatment on planktonic bacterial communities in water cooling systems

Brözel, V.S. (Volker Siegfried), 1963-; Cloete, T.E. (Thomas Eugene), 1958- (Water Research Council, 1992-04)

Bactericides were applied to experimental open recirculating cooling-water systems at concentrations found to be effective under laboratory pure-culture conditions. Total aerobic plate counts and bacterial population ...
Food security in South Africa

Van Zyl, Johan; Kirsten, Johann F. (Agricultural Economics Association of South Africa, 1992-12)

South Africa's agricultural policy has had food self-sufficiency as a major objective until recently. This is still the case for a number of the homelands. South Africa has to a large extent achieved this goal by producing ...
Moontlike implikasies van die Uruguay-rondte van multilaterale handelsonderhandelinge vir Suider-Afrika in die algemeen en die Suid-Afrikaanse landbousektor in die besonder

Van der Merwe, A.J.; Kirsten, Johann F. (Agricultural Economics Association of South Africa, 1992-12)

Dit is steeds moontlik dat die Uruguay-rondte van Multilaterale Handelsonderhandelinge teen vroeg 1993 suksesvol afgesluit kan word. Indien 'n nuwe AOTH-ooreenkoms op grond van die huidige besprekingsdokument, die ...
Surplus producers and the food price dilemma in traditional agriculture in Southern Africa: empirical evidence from the Farmer Support Programme

Kirsten, Johann F.; Sartorius von Bach, Helmke Jens (Agricultural Economics Association of South Africa, 1992-12)

The purpose of this paper is to add new evidence to studies already done on factors associated with surplus producers and on the food price dilemma in traditional agriculture. Survey data of rural households in the FSP ...
One to four hectares : what effects can a FSP strategy have on such households?

Singini, Richard E.; Sartorius von Bach, Helmke Jens; Kirsten, Johann F. (Agricultural Economics Association of South Africa, 1992-12)

The concept of the Farmer Support Programme (FSP) is one of serving and supporting all small farmers, so that they can be more efficient in competing in agricultural resource markets and gain better control over their own ...
Expenditure patterns of agricultural households in Lebowa and Venda : effects of the Farmer Support Programme on food security

Dankwa, K.B.; Sartorius von Bach, Helmke Jens; Van Zyl, Johan; Kirsten, Johann F. (Agricultural Economics Association of South Africa, 1992-12)

The specific objective of this paper is to determine expenditure patterns of rural households with a view to evaluating factors which make households more food secured. Expenditure patterns of households participating in ...
Agricultural and rural development

Van Zyl, Johan; Kirsten, Johann F. (WR Publications, 1993)

These papers review the structure and characteristics of agriculture in South Africa, the position of blacks in the sector, access to and utilisation of land and other resources by white and black South Africans, the scope ...
The role of extension in traditional agriculture : evidence from the Farmer Support Programme

Kirsten, Johann F.; Van Zyl, Johan; Sartorius von Bach, Helmke Jens (South African Society for Agricultural Extension, 1993)

This paper evaluates the extension and training element of the FSP as implemented in the farmer support programmes of Venda and Lebowa. The importance and contribution of extension and training in the success of the programme ...
Quarterly Newsletter April 1993

Whittle, A.M.; Temple, S.J.; Mkwaila, B. (Tea Research Foundation (TRFCA), 1993-04)

Fluid Bed dryer monitoring and control. In the dryer, the first parameter that is measured is the input temperature.When the dhool enters, the dryer, there is around 2.5 times as much water as dry matter in it.When this ...
Adaptation of bacterial cultures to non-oxidising water treatment bactericides

Brözel, V.S. (Volker Siegfried), 1963-; Pietersen, Belinda; Cloete, T.E. (Thomas Eugene), 1958- (Water Research Council, 1993-07)

Bacterial communities in water-cooling systems treated with bactericides often become resistant to these bactericides. This has been ascribed to selection for resistant cells. Certain bacteria, having a high inherent ...
Bemarkingsmoontlikhede van droëbone in Suid-Afrika : meer of minder beheer

Kirsten, Johann F.; Van Zyl, Johan (Agricultural Economics Association of South Africa, 1993-09)

Die bemarkingsmoontlikhede van droëbone in Suid-Afrika word ondersoek aan die hand van teoretiese beginsels en beskikbare markinligting. Die vraag na en aanbod van droëbone en die konsentrasie in die mark word ontleed. ...
Application of Sterikon bioindicators for the determination of bactericide concentrations

Cloete, T.E. (Thomas Eugene), 1958-; Da Silva, E.; Brözel, V.S. (Volker Siegfried), 1963- (Water Research Council, 1993-10)

Biofouling in industrial water systems is normally prevented by the use of bactericides. However, bactericide programmes often fail owing to the lack of suitable techniques for determining the in situ bactericide concentration ...
The marketing of livestock in South Africa's developing areas: a case study of the role of speculators, auctioneers, butchers and private buyers in Lebowa

Nkosi, S.A.; Kirsten, Johann F. (Agricultural Economics Association of South Africa, 1993-12)

Despite the important social and cultural value of livestock, especially cattle, there is a growing tendency amongst rural households to sell livestock. This paper is based on research into livestock marketing in developing ...
The role of credit in the farmer support programme: is it the key to success?

Coetzee, G.K.; Kirsten, Johann F.; Van Zyl, Johan (Agricultural Economics Association of South Africa, 1993-12)

This paper concentrates on the credit element of Farmer Support Programmes (FSP) and the financial environment in which FSP cedit is applied with a view to assess the importance of the credit component in the FSP. First, ...

Now showing items 1-20 of 2161

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