Search
Search results for
We found
24 results for you
-
Fisiologiese blaarabnormaliteite en bolopbrengs by katoen (Gossypium hirsutum L.) soos deur kalium-, kalsium- en boorvoeding beïnvloed
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. J.J. Combrink --- Navorsingsinstituut vir Tabak en Katoen,Physiological leaf abnormalities and boll yield of cotton (Gossypium hirsutum L.) as affected by potassium, calcium and boron nutrition. A pot trial with a sand medium and two levels each of K, Ca and B nutrition, factorially arranged, was carried... -
Effect of Ca, K and B supply on water-stress induced chlorophyll loss from tobacco and cotton leaf discs
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: ElizabethA. Davies --- , England N. J.J. Combrink --- , Republic of South AfricaA study was made of the influence of Ca:K ratios and B levels on the chlorophyll content of tobacco and cotton leaves grown under glasshouse conditions. Excised leaf discs were floated on a solution of polyethylene glycol 6000 to study... -
Effect of Ca, K and B supply on growth of cotton (Gossypium hirsutum L.) and tobacco (Nicotiana tabacum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. J.J. Combrink --- , Republic of South Africa ElizabethA. Davies --- , EnglandThe effect of Ca:K ratios and B nutrition was investigated using tobacco and cotton grown in Mitcherlich pots with sand. A nutrient solution with three different ratios of Ca:K and two boron levels was used. Treatments were arranged factorially (3... -
'n Vogstremmingsindeks vir gebruik in besproeiing van katoen
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.C. Dippenaar --- , Republiek van Suid-Afrika Catharina Weyers --- , Republiek van Suid-AfrikaDie behoefte bestaan om plantparameters as kritiese indikatore aan te wend om besproeiingsbestuur te vergemaklik. Die blaarwaterpotensiaal (ψb) van katoen en relatiewe turgiditeit (RT%) van blaarskyfies is gedurende 1983 tot 1985 en tydens die 1986/87-seisoen bepaal. Hierdie metings is op... -
Release of cotton breeding lines (Gossypium hirsutum L.) adapted to South African conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.G. van Heerden --- , Republic of South Africa W.H. van Staden --- , Republic of South Africa L. J.B. Rossouw --- , Republic of South Africa C.G. Theron --- , Republic of South AfricaThe cotton breeding programme of the Tobacco and Cotton Research Institute has made available a number of advanced breeding lines and cultivars of cotton for a second cycle of intercrossing and selection. Selati, Gariep and NIK3 have been released for... -
Comparison of cotton (Gossypium hirsutum L.) yield and fibre properties over locations and seasons
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.G. van Heerden --- , Republic of South Africa W.H. van Staden --- , Republic of South Africa G. Vink --- , Republic of South Africa H. van Ark --- , Republic of South AfricaThe cotton breeding program in the Republic of South Africa is conducted at the localities Loskop, Upington and Vaalharts. Preliminary results from breeding trials indicated that a finer but more mature fibre could be produced at Vaalharts as compared to... -
The effect of date of planting on the fibre properties of four cotton cultivars grown under irrigation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.I. Greeff --- , Republic of South Africa J.J. Human --- Department of Agronomy, Republic of South AfricaThe effects of date of planting on the fibre properties of four cotton cultivars, Acala 1517–70, Albar 70C, Deltapine 5826 and Albacala CS-2, were investigated under irrigated conditions over a 3-year period near Groblersdal. Six dates of planting at fortnightly... -
Die invloed van plantpopulasie op opbrengs en kwaliteit van katoen (Gossypium hirsutum L.) in die Vaalharts- en Sandvetbesproeiingsgebiede
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.P. de Bruyn --- Landboufakulteit, Republiek van Suid-Afrika J. de Kock --- Departement Landbou en Watervoorsiening, Kleingraansentrum, Republiek van Suid-Afrika J.J. Human --- Landboufakulteit, Republiek van Suid-AfrikaDie invloed van plantdigtheid op die opbrengs en kwaliteit van katoen is vir die Vaalharts- en Sandvetbesproeiingsgebiede ondersoek. Aangesien hoër plantpopulasies hoër eise aan water- en stikstofvoorsiening stel, is hierdie effek by verskillende peile van besproeiing en stikstofbemesting uitgetoets. Individuele... -
Die effek van vertraging van besproeiing op die opbrengs en kwaliteit van katoen (Gossypium hirsutum L.) in die Vaalhartsbesproeiingsgebied
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. de Kock --- Landboufakulteit, Republiek van Suid-Afrika J.J. Human --- Landboufakulteit, Republiek van Suid-Afrika L.P. de Bruyn --- Landboufakulteit, Republiek van Suid-AfrikaAangesien dit reeds bekend is dat katoen tydens die eerste stadia van die groeiperiode minder gevoelig vir watertekorte is, is 'n proef oor drie seisoene op Vaalharts uitgelê waar die eerste besproeiing na opkom van die saailinge uitgestel is totdat... -
Controlling excessive growth in cotton by multiple applications of low concentrations of mepiquat chloride
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.C. Dippenaar --- , Republic of South Africa C.R. Nolte --- , Republic of South Africa C. Barnard --- , Republic of South AfricaExcessive vegetative growth of cotton occurs under favourable growing conditions and this contributes to yield losses. Low concentrations of mepiquat chloride (1, 1-dimethylpiperidinium chloride) were applied to vigorous, growing cotton by means of two or more sprays at different time... -
The effects of environment on the relationship between cotton fibre properties and yarn characteristics
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.G. van Heerden --- , Republic of South Africa W.H. van Staden --- , Republic of South Africa H. van Ark --- , Republic of South AfricaCotton fibre samples from three different localities were commercially processed into 15 and 30 tex ring spun yarns and 20, 30 and 50 rotor spun yarns. Multiple regression analyses were used to relate yarn tenacity and irregularity to the different... -
Minimum nagtemperatuur en groeiseisoenlengte van katoenproduserende gebiede in Suid-Afrika
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.C. Dippenaar --- , Republiek van Suid-Afrika J.J. Human --- Departement Agronomie, Republiek van Suid-Afrika'n Bewegende gemiddelde daaglikse minimum nagtemperatuur, T[mbar][nbar] (per vyf dae) is oor 8–15 j vir 23 weer- stasies bereken wat verspreid in die katoenproduserende gebiede van die Republiek van Suid-Afrika aanwesig is. As onderste temperatuurdrempel, of basistemperatuur waarby groei van... -
Registration of cotton (Gossypium hirsutum L.) cultivars Letaba, NIK2 and OR19
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.G. van Heerden --- , Republic of South Africa W.H. van Staden --- , Republic of South Africa G.W. Schoeman --- , Republic of South Africa M.E. Stone --- , Republic of South Africa G. S.P. Vink --- , Republic of South AfricaLetaba, NIK2 and OR19 were released for commercial cultivation in the R.S.A. in 1989. Letaba has potential as a dryland cultivar in the Springbok Flats and northern Natal. NIK2 is intended for cultivation under irrigation in the same areas and... -
Daggrade van katoenproduserende gebiede in Suid-Afrika
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.C. Dippenaar --- , Republiek van Suid-Afrika J.J. Human --- Departement Agronomie, Republiek van Suid-Afrika'n Bewegende gemiddelde daaglikse minimum en maksimum lugtemperatuur is vir 23 weerstasies bereken wat in die katoenproduserende gebiede van Suid-Afrika aanwesig is. Hierdie data is gebruik om daagliks kumulatiewe daggrade (ΣDG) oor die periode 3 September tot einde van Mei... -
Drought-related protein synthesis in cotton
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. van der Mescht --- , Republic of South Africa J.A. de Ronde --- , Republic of South AfricaThe changes in protein profiles of six cotton cultivars subjected to osmotic stress were examined. Osmotic stress was applied by incubating leaf segments in mannitol. The efficiency of protein synthesis decreased with increasing concentrations of mannitol. Drought-related protein synthesis during... -
Heat-shock protein synthesis in cotton is cultivar dependent
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.A. de Ronde --- , Republic of South Africa A. van der Mescht W.A. Cress --- Department of Botany, Republic of South AfricaThe synthesis of heat-related proteins in six cotton cultivars was examined. The protein profiles of heat-stressed plants were highly cultivar specific. Heat-related proteins did not result from protein degradation. Recovery to normal protein synthesis occurred within an hour after the... -
Die gebruik van groeireguleerders om die blomperiode van katoen te wysig
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.C. Dippenaar --- , Republic of South Africa T.J. Meyer --- , Republic of South AfricaKatoengebiede in Suid-Afrika, hoër as 950 m bo seevlak, het 'n kort groeiseisoen indien laat in November geplant word. Die bydrae van groeireguleerders en verbouings praktyke om rypwording van laat geplante katoen te verhaas en die uitwerking daarvan op veselgehalte,... -
Synthesis of heat-shock proteins in six cotton cultivars at different heat treatments
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.A. de Ronde --- , Republic of South Africa W.A. Cress --- Department of Botany, Republic of South AfricaChanges in protein synthesis in leaf tissue of six cotton cultivars were studied by comparing the heat-shock protein patterns synthesized at different heat treatments. Leaf tissue responded to thermotolerance treatments by synthesizing a specific set of proteins for each treatment... -
Detecting nitrogen deficiency on irrigated cash crops using remote sensing methods
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.S. Fouche --- Department of Soil Science, Republic of South AfricaEarly detection of nitrogen deficiency on annual agricultural crops can assist the management of N-fertilization to improve crop yields. Low altitude aerial photography is an inexpensive means to assess crop canopy radiation in the near infrared range. In this study,... -
Weed survey in cotton (Gossypium hirsutum L.) and sunflower (Helianthus annuus L.) fields in the Pandamatenga plains of northeastern Botswana
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.E. Abdullahi --- Department of Agricultural Research, BotswanaSunflower and cotton fields in the Pandamatenga plains of northeastern Botswana were surveyed in 1998 and 1999 for weed infestations. Twenty-seven and 24 species were identified from the fields in 1998 and 1999, respectively. Nineteen and 17 species were found... -
Effects of seed priming and water potential on germination of cotton (Gossypium hirsutum L.) and maize (Zea mays L.) in laboratory assays
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: F.S. Murungu --- Department of Agronomy, Faculty of Natural Resources and Agriculture, Zimbabwe P. Nyamugafata --- Department of Soil Science and Agricultural Engineering, Faculty of Agriculture, Zimbabwe C. Chiduza --- Department of Crop Science, Faculty of Agriculture, Zimbabwe L.J. Clark --- , UK W.R. Whalley --- , UKSub-optimal crop emergence and establishment is a problem in crop production owing to low soil moisture. The effects of seed priming (seed soaking) on cotton and maize germination at different water potentials (0, −10 kPa, −100kPa, −200 kPa, −500 kPa... -
Glasshouse screening of CIMMYT wheat germplasm for Fusarium head blight response in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Catharina I de Villiers --- Agricultural Research Council–Small Grain Institute, South AfricaFusarium head blight (FHB), mainly caused by Fusarium graminearum, is a serious disease of wheat, barley, oat and maize. Yield losses up to 40% have been reported and grain may contain mycotoxins that are harmful to humans and animals. In... -
Effects of fire, bruchid beetles and soil type on germination and seedling establishment of Acacia drepanolobium
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: B.D. Okello T.P. YoungThe effects of fire, bruchid seed beetles and soil type on the germination and seedling establishment of Acacia drepanolobium were experimentally investigated. Seeds subjected to three seed treatments (bruchid damaged, bruchid-free burnt, and bruchid-free unburned) were germinated in three different... -
Chlorophyll a fluorescence as an indicator of heat stress in cotton (Gossypium hirsutum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MM van der Westhuizen --- , South Africa DM Oosterhuis --- , USA JM Berner --- , South Africa N Boogaers --- , South AfricaCotton (Gossypium hirsutum L.) is a major fibre crop that is greatly affected by climatic factors, especially drought and high temperatures. Excessive temperature (above 30 °C) during the reproductive stage (flowering) negatively affects cotton yield potential. Four diverse cotton genotypes...