Articles by Author: Petrus J Pieterse

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  1. Effect of varying degrees of plant residue cover from different crops on annual medic pasture re-establishment and production

    Effect of varying degrees of plant residue cover from different crops on annual medic pasture re-establishment and production

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Annual medics can play an important role as a pasture crop in short-rotation pasture-cropping systems in the Overberg district of South Africa. Permanent soil cover, an important aspect of conservation agriculture, and different crops in rotation may be, amongst other...
  2. Vegetative growth of <em>Amaranthus hybridus</em> and <em>Amaranthus tricolor</em> under different watering regimes in different seasons in southern Mozambique

    Vegetative growth of <em>Amaranthus hybridus</em> and <em>Amaranthus tricolor</em> under different watering regimes in different seasons in southern Mozambique

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Drought-tolerant crops with high nutritional value such as amaranth leafy vegetables have the potential to improve the diet of rural communities in dry semi-arid areas of southern Mozambique. A study was conducted aiming to assess the vegetative growth and leaf...
  3. Impact of seasonal nitrogen fertilisation on production characteristics of a mixed grass pasture in the Western Cape province of South Africa

    Impact of seasonal nitrogen fertilisation on production characteristics of a mixed grass pasture in the Western Cape province of South Africa

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Pasture production in the Western Cape has traditionally been based on temperate species producing the majority of fodder during spring and autumn after which dry matter production decreases in winter. To investigate seasonal fertiliser nitrogen (N) management strategies to optimise...
  4. Floristic and Structural Composition of Wonderwoud Forest in the Wolkberg, North-Eastern Transvaal

    Item type: Journal Article • Journal: South African Forestry Journal
    The closed, evergreen forest of 450 ha was studied by means of a survey of 55 circular plots of 0,04 ha, distributed in a grid pattern. TWINSPAN classification separated the forest into four stand types: Olea capensis macrocarpa—Xymalos monospora—Syzygium gerrardii...
  5. A comparison of highveld fodders and fodder flows for growing out long yearling steers

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    A fodder flow/animal experiment 40,8 ha in extent (7,5 ha irrigated), with 19 paddocks, was carried out over a two and a half year period.
  6. Preference rating and other characteristics of a few promising <em>eragrstos curvula</em> ecotypes as determined by grazing sheep

    Preference rating and other characteristics of a few promising <em>eragrstos curvula</em> ecotypes as determined by grazing sheep

    Eragrostis curvula cv. Ermelo, as control, was tested against several ecotypes at two localities in the Transvaal Highveld in respect of dry matter yield, percentage utilization, preference rating and herbage quality, using sheep mainly, as tester animals. The ecotypes were:...
  7. Produksie en kwaliteit van ‘n aantal grasspesies in die <em>Combretum‐</em>veld van noord‐transvaal

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Die produksie en kwaliteit van vyf spesies (Themeda triandra, Heteropogon contortus, Digitaria eriantha var. pentzii, Schmidtia pappophoroides en Eragrostis rigidior) is by verskillende frekwensies van ontblaring op ontbosde en onontbosde bosveld gemeet. In die daaropvolgende jaar is intensiteit bygebring met...
  8. Die invloed van die beskikbaarheid van nutriënte en ontblaringsbestuur op die produksie van <em>digitar1a Eriantha</em> variëteit <em>Eriantha</em>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Die invloed van verskillende peile van stikstof (N), fosfaat (P) en kalium (K) op die produksie en kwaliteit van Digitaria eriantha var. eriantha is in sandkultuur ondersoek. Verder is daar ook gekyk na die invloed van drie intensiteite van ontblaring...
  9. Groei en produksie van ‘n aanal aangeplante weidings onder beweiding

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Die groei en produksie onder beweiding van ‘n aantal aangeplante weidings is met behulp van die verskilmetode bepaal. Uit die data verkry in die proef is dit duidelik dat indien daar besproeiingswater beskikbaar is, groen materiaal dwarsdeur die jaar voorsien...
  10. ‘n Vergelyking van wei‐ en voergewasse vir die produksie van slaglammers in die Pretoria‐ Witwatersrand‐Vereeniging(PWV)‐gebied

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    A comparison of pasture and fodder crops for the production of slaughter lambs in the Pretoria‐Witwatersrand‐Vereeniging (PWV) area. A number of pasture and fodder species were evaluated for the production of mutton with weancr lambs. Animal performance and meat production...