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Die invloed van plantdatum op die groei en ontwikkeling van grondbone (Arachis hypogaea L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.J. van Rooyen --- Direktoraat Bio- en Datametriese Dienste, Republiek van Suid-Afrika C.J. Swanevelder --- , Republiek van Suid-AfrikaGrondbone wat vir drie seisoene op drie plantdatums, nl. die laaste week van Oktober, middel November en die eerste week van Desember geplant is, het laer opbrengste gelewer namate later geplant is. Groei-analisedata is weekliks geneem op blare, stamme, peule... -
Response to inoculation of groundnuts grown under irrigation in soil containing indigenous rhizobia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B. Kishinevsky --- Division of Legume Inoculation, Agricultural Research Organization, The Volcani Center, Israel B.W. Strijdom --- , Republic of South Africa C.J. Otto --- , Republic of South Africa H.H. Lochner --- , Republic of South Africa M.M. Kriel --- , Republic of South AfricaFive strains of Bradyrhizobium spp. highly effective on groundnuts (Arachis hypogaea L.) were used to inoculate groundnuts grown under irrigation in each of two soils. Both soils contained small numbers of indigenous rhizobia capable of nodulating groundnuts. Root nodules typed... -
Implications of Chalara elegans resistance in groundnut breeding
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P. J.A. van der Merwe --- Oil and Protein Seed Centre, Republic of South Africa L.P. van der Merwe --- Oil and Protein Seed Centre, Republic of South Africa H. L.N. Joubert --- Oil and Protein Seed Centre, Republic of South AfricaGenetic advances in six important traits in the groundnut, including resistance to C. elegans, were determined in field trials conducted at the Vaalharts Research Station during 1988/89 using a randomized block design. Results indicated that significant genetic advances for the... -
Nature and importance of subterranean insect damage to pre-harvest groundnuts
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.F. van Eeden --- , Republic of South Africa J. B.J. van Rensburg --- Summer Grain Centre, Republic of South Africa T. C. de K. van der Linde --- Department of Zoology and Entomology, Republic of South AfricaThe nature and importance of insect damage to subterranean pre-harvest groundnuts were determined by regular sampling in commercial groundnut fields. Five categories of damage are described, viz. damage to newly planted seed, pegs, immature pods, mature pods and kernels. Both... -
The effect of pod scarification by soil inhabiting insects on the quality of groundnuts (Arachis hypogaea L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.F. van Eaden --- , Republic of South Africa J. B.J. van Rensburg --- Summer Grain Centre, Republic of South Africa T. C. de K. van der Linde --- Department of Zoology and Entomology, Republic of South AfricaThe effect of pod scarification by soil insects on the yield and quality of groundnuts was determined at thirty localities in the Highveld Region of South Africa. Subsamples of superficially damaged pods and sound pods were shelled separately, the kernels... -
The role of insect damage in the colonization of groundnut (Arachis hypogaea L.) pods by fungi
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.F. van Eeden --- , Republic of South Africa J. B.J van Flensburg --- Summer Grain Centre, Republic of South Africa T. C. de K. van der Linde --- Department of Zoology and Entomology, Republic of South AfricaThe incidence of fungal infection in insect-damaged and healthy pods and the resultant colonization of kernels was determined from commercial fields at four localities over a period of two seasons. Based on number of colonies per 100 plates, the order... -
Evaluation of chemical control against the insect complex of groundnuts (Arachis hypogaea L.) in the South African Highveld Region
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.F. van Eeden --- , Republic of South Africa J. B.J. van Rensburg --- Summer Grain Centre, Republic of South Africa T. C. de K. van der Linde --- Department of Zoology and Entomology, Republic of South AfricaChemical compounds representing seed treatments, soil-applied systemic insecticides, contact and systemic corrective sprays were tested on the groundnut pest complex for three seasons in the South African Highveld Region. The efficacy of the compounds was evaluated by determining the effect...