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Reaction of oriental tobacco to spacing and topping treatments at three levels of nitrogenous fertilizer application
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.P. Lamprecht --- , W. J.C. van der Merwe --- ,Three levels of nitrogenous fertilizer were applied to oriental tobacco (Nicotiana tabacum L. cv. Elcatra) at different spacings and topped to 14 and 28 leaves per plant respectively. Yield, income, total nitrogen and total alkaloids of the cured leaves increased,... -
Effects of plant density and row spacing on Lupiniis albus cv. Kiev
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: V.D. Wassermann --- Department of Agriculture, Republic of South AfricaTwo field trials in which the effects of plant density and row spacing on L. albus cv. Kiev were studied, are described. One trial was carried out on dryland and the Other under irrigation. Plant densities ranging from c. 20... -
Evaluering en kalibrering van CERES-Maize: 3. Rywydtes in die westelike Hoëveld
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.S. du Toit --- , Republiek van Suid-Afrika J. Booysen --- Departement Plantkunde, Republiek van Suid-Afrika J.J. Human --- Departement Agronomie, Republiek van Suid-AfrikaIn die westelike-Hoëveld waar reënval die mees beperkende hulpbron is, is lae plantpopulasie en wye rye erkende produksiepraktyke vir mielies. Die praktyke verskil beduidend van die praktyke waaronder CERES- Maize ontwikkel is. Ten einde CERES-Maize te evalueer ten opsigte van... -
Boundary layer, stomatal geometry and -spacing, in relation to drought tolerance in four Nicotiana tabacum L. cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L. Van Rensburg --- , Republic of South Africa J. Peacock --- , Republic of South Africa G. H.J. Krüger --- Department of Plant and Soil Sciences, Republic of South AfricaAlthough numerous studies, both phenomenological and mathematical, have related gaseous interchanges at the plant leaf surface and atmospheric interface specifically with regard to drought tolerance, the important role of trichomes and the boundary layer has not been recognized. In this... -
Maize cropping system analysis and economic comparison for two environments
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.A. Prinsloo --- , Republic of South Africa H. J.H. Erasmus --- , Republic of South AfricaThe effect of different maize cropping systems and economic implications were investigated at two localities from 1994 to 2000. Soil types differed, and the topsoil at Bloekomspruit and Viljoenskroon contained 17% and 5% clay, respectively. The five primary cropping systems... -
Calibration and validation of the SWB irrigation scheduling model for soybean [Glycine max. (L.) Merr., indeterminate cv. Wayne]
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.Z. Jovanovic --- Department of Plant Production and Soil Science, South Africa J.G. Annandale --- Department of Plant Production and Soil Science, South Africa A. T.P. Bennie --- Department of Soil Science, South AfricaSoil Water Balance (SWB) is a mechanistic, irrigation scheduling, generic crop model including a database of crop specific growth parameters. The objective of this study was to calibrate and validate this model for soybean [Glycine max. (L.) Merr., indeterminate cv... -
Growth modelling of Pinus roxburghii in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: E.R. Falkenhagen --- , South AfricaThe growth in diameter at breast height, height and tree volume and plot density were studied in an unreplicated spacing trial of Pinus roxburghii at Weza, South Africa. -
Rectangular Espacement Does Not Cause Stem Ellipticity in Eucalyptus grandis
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Brian Bredenkamp --- Natal Forestry Research Centre, Department of Environment Affairs,Eucalyptus grandis grown with varying degrees of rectangularity of growing space showed that stem ellipticity could not be attributed to proximity of nearest neighbours. Stem ellipticity was markedly orientated along wind directions prevailing in the Eastern Transvaal. Extreme rectangularity of... -
Effects of Spacing and Age on Growth of Eucalyptus grandis on a Dry Zululand Site
Item type: Journal Article • Journal: South African Forestry Journal • Authors: B.V. Bredenkamp --- ,The response of unthinned Eucalyptus grandis to initial stand density ranging from 25 to 6 670 stems per hectare up to 22 years of age is described using simple quadratic functions. This method resulted in distorted estimates of growth parameters... -
Growth and yield models for Eucalyptus grandis grown in Swaziland
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M du Plessis --- , South Africa H Kotze --- , South AfricaThe aim of this study was to develop a stand-level growth and yield model for short-rotation Eucalyptus grandis grown for pulp wood production at Piggs Peak in Swaziland. The data were derived from a Nelder 1a spacing trial established with... -
Shoot allometry of Jatropha curcas
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: SB Ghezehei --- Department of Plant Production and Soil Science, South Africa JG Annandale --- Department of Plant Production and Soil Science, South Africa CS Everson --- Department of Plant Production and Soil Science, South AfricaThe South African government has banned planting of Jatropha curcas L. (Jatropha), potentially a multipurpose tree and biofuel source, owing to insufficient knowledge about the species. Use of allometry as a non-destructive method of monitoring growth and biomass attributes of... -
Development of a stand density management diagram for Santalum album plantations in Karnataka, India
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Vindhya Prasad Tewari --- Himalayan Forest Research Institute, India Baragur N Diwakara --- Forest Biometry Division, Institute of Wood Science and Technology, IndiaStand density management diagrams are average stand-level models that graphically display the relationship between stand yield, density, height and diameter throughout the various stages of forest development in even-aged stands. These are useful tools for designing, displaying and evaluating alternative... -
The Effect of Provenance, Plant Spacing and Cutting Interval on Leaf Biomass Yield of Moringa Oleifera Lam.
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: C. T. Gadzirayi --- Bindura University of Science Education, Zimbabwe F. Kubiku --- Bindura University of Science Education, Zimbabwe J. Mupangwa --- University of Fort Hare, South Africa B. Masamha --- Bindura University of Science Education, Zimbabwe L. Mujuru --- Bindura University of Science Education, ZimbabweTwo provenances of Moringa oleifera Lam., Malawi and Mutoko, were evaluated to determine the effect of plant spacing and cutting interval on the leaf biomass yield for fodder production. A split-split plot experimental design was set up with provenance as... -
Density effect on growth variables of eucalypt clones in a Nelder wheel experiment
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Franciele Alba da Silva --- , Brazil Sylvio Péllico Netto --- , Brazil Alexandre Behling --- , Brazil Henrique Soares Koehler --- , Brazil Ataídes Marinheski Filho --- , Brazil Cláudio Cerqueira --- , BrazilNelder’s systematic design enables studies of tree plantation spacing in relatively small areas, which is of great interest for forest planning. However, dependence between observations can arise with this method, making it difficult to use classic statistics for evaluating an...