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  1. Article: The development of vineyard zonation and demarcation in South Africa

    Saayman, D.

    Wynboer

    1999  , Page(s) (1) T2–T5

    Abstract: Vineyards were mainly established in the south-western coastal zone around the Cape and in adjacent inland synclinal river valleys were irrigation water was available. These areas, characterized by a Mediterranean climate, are still the main wine ... ...

    Institution Univ. of Stellenbosch, Dep. of Soil Science, 7602 Matieland (Stellenbosch), Republic of South Africa
    Abstract Vineyards were mainly established in the south-western coastal zone around the Cape and in adjacent inland synclinal river valleys were irrigation water was available. These areas, characterized by a Mediterranean climate, are still the main wine producing regions today. Demarcation of existing vineyards was, and still is, done by technical experts, using four categories, viz. (1) Regions, based on broad geographical features and administrative boundaries; (2) Districts, based on geographical and macro climatic features; (3) Wards, essentially based on uniform soil, climatic and ecological patterns; and (4) Estates, based on the concept of singular ownership of vineyards and wine being produced on the estate. Lacking sufficient tradition, experience and experimental information, compared to the old world wine countries, the philosophy behind demarcation in South Africa is to identify natural terrain units, using available technical information, and then allowing such units to develop and demonstrate particular wine styles and character, rather than demanding proof of uniqueness before demarcation is done. [D 112] (Ed. auth. abstract)
    Keywords VITICULTURE ; SYSTEMATICS ; DENOMINATION OF WINE ; SOIL ; CLIMATE ; REPUBLIC OF SOUTH AFRICA
    Language English
    Document type Article
    Database Viticulture and Oenology Abstracts

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  2. Article: The problem of green Waltham Cross grapes

    Saayman, D.

    Deciduous Fruit Grower

    1985  , Issue 12, Page(s) 431–434

    Abstract: There are apparently 3 types of green coloured Waltham Cross grapes: Early harvested grapes which just meet the sugar/acid regulations; bunches which on account of certain circumstances develop an unattractive blue-green colour which never colours to ... ...

    Abstract There are apparently 3 types of green coloured Waltham Cross grapes: Early harvested grapes which just meet the sugar/acid regulations; bunches which on account of certain circumstances develop an unattractive blue-green colour which never colours to yellow; the so called 'tired' grapes which probably represent a form of strained maturity attributed to water stress. Delivery of green or blue-green grapes caused increasing marketing problems. - Author recommends the following measures for overcoming the green coloured Waltham Cross problem: Restricting the production to levels below 6000 cartons/ha, suckering for improving light penetration starting from the stage that shoots reach a length of 15 cm, topping and removal of leaves to eventually have not fewer than 12-15 leaves/bunch on a shoot, opening a 'window' in the foliage which will at 12 noon give a strip of sunlight of at least 0.5 metre on the ground as well as 20 % spots of sunlight in the shady strip on the ground, planting distances of 3 * 1.8 m, limiting soil nitrogenous fertilization to 120 kg N/ha on poor soils and half to zero in fertile soils. (A.-A. Bravdo, Rehovot) [8930]
    Keywords table grape ; pigment ; republic of south africa
    Language English
    Document type Article
    Database Viticulture and Oenology Abstracts

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  3. Article: Viticultural terroirs in Stellenbosch, South Africa. III. Spatialisation of viticultural and oenological potential for Cabernet Sauvignon and Sauvignon blanc by means of a preliminary model

    Carey, V. A. / Archer, E. / Barbeau, G. / Saayman, D.

    Journal International des Sciences de la Vigne et du Vin, France

    2009  Volume 43, Issue 1, Page(s) 1–12

    Abstract: Aims: Identification and characterisation of terroirs depends on knowledge of environmental parameters, functioning of the grapevine and characteristics of the final product. Field studies, resulting in point data, are necessary to investigate the ... ...

    Institution Stellenbosch Univ., Dep. of Viticulture and Oenology, 7602 Matieland, Republic of South Africa
    Abstract Aims: Identification and characterisation of terroirs depends on knowledge of environmental parameters, functioning of the grapevine and characteristics of the final product. Field studies, resulting in point data, are necessary to investigate the functioning of the grapevine but in order for this information to be of use within zoning studies it must be placed in a spatial context. Methods and results: A knowledge-driven model used the rules generated in regression tree analyses to directly classify natural terroir units with respect to expected response of Cabernet-Sauvignon and Sauvignon blanc in the Stellenbosch Wine of Origin District. The natural terroir units were then grouped into terroir units that were homogenous with respect to predicted response of selected viticultural and oenological variables for each studied cultivar. Conclusions: The use of regression tree methodology (CART analyses) enabled the definition of decision trees for spatialisation of this data. Each natural terroir unit could be evaluated with respect to its potential viticultural and oenological response and thus grouped to identify terroir units. Significance and impact of the study: The identified terroir units can only be considered preliminary but the methodology used has promising implications for different scales of study. [AZ 219a] (Auth. abstract)
    Keywords REPUBLIC OF SOUTH AFRICA ; SITE ; CLIMATE ; MUST QUALITY ; FLAVOUR ; VARIETY OF VINE ; PHENOLOGY
    Language English ; French
    Document type Article
    ZDB-ID 1045243-6
    ISSN 1151-0285
    ISSN 1151-0285
    Database Viticulture and Oenology Abstracts

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  4. Article: Growth stop in Sultana cultivated under climatic conditions favorable tovigorous growth

    Saayman, D.

    Bulletin de l'OIV

    1983  Volume 56, Page(s) 521–533

    Abstract: In South Africa along the Orange River Sultana vines exert the so-called ''growth arrestment disease'' (GAD) which is characterized by a delayed bud burst, stunted sprouts in spring, abortion of inflorescences and resumption of vigorous growth thereafter. ...

    Abstract In South Africa along the Orange River Sultana vines exert the so-called ''growth arrestment disease'' (GAD) which is characterized by a delayed bud burst, stunted sprouts in spring, abortion of inflorescences and resumption of vigorous growth thereafter. In these cases yield losses were 80 % and more. Applications of K2SO4 (3t/ha) to the soil and to the foliage did not reduce the rate of GAD. The C/N ratio in vines showing symptoms of GAD was out-of-balance (as was reported already by KLIEWER, 1978). Possibly a relation exists between GAD and the high temperatures and/or the frequency of irrigation in the period of winter dormancy.(Duering, H.; Geilweilerhof)
    Keywords disease ; symptomatology ; climate ; soil ; mineral
    Language French
    Document type Article
    Database Viticulture and Oenology Abstracts

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  5. Article: Investigations into the causes and control of the growth arrestment phenomenon of Sultana. II. Preliminary experimental investigations

    Saayman, D.

    South African Journal for Enology and Viticulture, Stellenbosch

    1983  Volume 4, Page(s) 27–34

    Abstract: Vines with growth arrestment phenomenon showed no response to K fertilization but response to controlled irrigation. Changes in mineral content due to climatic and soil influences are supposed to be the cause for diseases. [Z 146] ...

    Abstract Vines with growth arrestment phenomenon showed no response to K fertilization but response to controlled irrigation. Changes in mineral content due to climatic and soil influences are supposed to be the cause for diseases. [Z 146]
    Keywords disease ; fertilizing ; potassium ; irrigation ; mineral ; soil ; climate
    Language English
    Document type Article
    Database Viticulture and Oenology Abstracts

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  6. Article: Investigations into the causes and control of the growth arrestment phenomenon of Sultana. I. Symptoms and survey results

    Saayman, D.

    South African Journal for Enology and Viticulture, Stellenbosch

    1983  Volume 4, Page(s) 21–26

    Abstract: Symptoms of growth arrestment phenomenon are described. GAP is mainly associated with low K values in soil and plants. [Z 146] ...

    Abstract Symptoms of growth arrestment phenomenon are described. GAP is mainly associated with low K values in soil and plants. [Z 146]
    Keywords disease ; symptomatology ; potassium ; deficiency ; irrigation ; republic of south africa
    Language English
    Document type Article
    Database Viticulture and Oenology Abstracts

    Kategorien

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  7. Article: L'arret de croissance de Sultana cultivee dans des conditions climatiques provoquant une croissance vigoureuse

    Saayman, D

    Bulletin - Office international de la vigne et du vin. July/Aug 1983. v. 56 (629/630)

    1983  

    Title translation Stopping growth of Sultana cultivated in climatic conditions cause vigorous growth.
    Title variant Stopping growth of Sultana cultivated in climatic conditions cause vigorous growth [Grapes, South Africa]
    Keywords grapes ; South Africa
    Language French
    Dates of publication 1983-07
    Size p. 521-533.
    Document type Article
    ZDB-ID 860329-7
    ISSN 0029-7127
    ISSN 0029-7127
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: Soil preparation studies: II. The effect of depth and method of soil preparation and of organic material on the performance of Vitis vinifera (var. Colombar) on Clovelly/Hutton soil

    Saayman, D.

    South African Journal for Enology and Viticulture, Stellenbosch

    1982  Volume 3, Page(s) 61–74

    Abstract: Investigations of roots showed no convincing effect of organic material additions but a strong positive effect of depth and efficiency of soil loosening.[Z 146] ...

    Abstract Investigations of roots showed no convincing effect of organic material additions but a strong positive effect of depth and efficiency of soil loosening.[Z 146]
    Keywords tillage ; soil ; humus ; root ; growth
    Language English
    Document type Article
    Database Viticulture and Oenology Abstracts

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  9. Article: Investigations into the cause and control of growth arrestment disease of Sultana. The effect of potassium applications, irrigation and production level on the incidence of growth arrestment disease. 1973-1981

    Saayman, D.

    Agricultural Research, Pretoria

    1982  , Page(s) 45–46

    Abstract: Various factors may cause 'growth arrestment disease' (GAD). Low K concentrations were found in soil and plant organs; concentrations of N, Mn and Zn in affected organs were high. The mechanism of GAD is still unclear. [AZ 89] ...

    Abstract Various factors may cause 'growth arrestment disease' (GAD). Low K concentrations were found in soil and plant organs; concentrations of N, Mn and Zn in affected organs were high. The mechanism of GAD is still unclear. [AZ 89]
    Keywords disease ; nutrition ; potassium ; mineral ; irrigation ; yield
    Language English
    Document type Article
    Database Viticulture and Oenology Abstracts

    Kategorien

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  10. Article: Soil preparation studies: Effect of depth of soil preparation and organic material additions on growth, production and quality of wine grapes. 1967-1981

    Saayman, D.

    Agricultural Research, Pretoria

    1982  , Page(s) 38

    Abstract: Results of the studies showed no convincing effect of organic material addition, but a positive effect of depth and efficiency of soil loosening. [AZ 89] ...

    Abstract Results of the studies showed no convincing effect of organic material addition, but a positive effect of depth and efficiency of soil loosening. [AZ 89]
    Keywords tillage ; green manuring
    Language English
    Document type Article
    Database Viticulture and Oenology Abstracts

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