Articles by Author: Sarina Claassens

Search results for Sarina Claassens

We found 24 results for you
  1. The effect of canola (<em>Brassica napus</em>) as a biofumigant on soil microbial communities and plant vitality: a pot study

    The effect of canola (<em>Brassica napus</em>) as a biofumigant on soil microbial communities and plant vitality: a pot study

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Canola (Brassica napus) may be incorporated into soil as a biofumigant for control of pathogens such as Sclerotinia sclerotiorum. Yet, the effect of biofumigants on natural microbial communities required to maintain soil functions is still unclear. A pot experiment with...
  2. Die invloed van fosfor, nitraat en ammonium op die opname en vervoer van stikstof en fosfor en op die groei van koring

    Die invloed van fosfor, nitraat en ammonium op die opname en vervoer van stikstof en fosfor en op die groei van koring

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    In 'n waterkultuureksperiment met koring is die invloed van verskillende P-toedienings (0,02 tot 5,0 me H2PO4 dm−3) en van verskillende NH4:NO3-verhoudings (0:15 tot 12:3) met 'n Hoagland-voedingsoplossing (no. 2) as kontrole bestudeer. Normale groei is reeds by 'n laer P-voorsiening...
  3. The influence of different P, NH<sup>+</sup>
               <sub>4</sub> and NO<sup>−</sup>
               <sub>3</sub> supply levels on the yield and P and Ca relationships in wheat

    The influence of different P, NH<sup>+</sup> <sub>4</sub> and NO<sup>−</sup> <sub>3</sub> supply levels on the yield and P and Ca relationships in wheat

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    In a water culture experiment with wheat, the influence on growth and nutrient uptake of varying the P supply from 0,02 to 5 mmol H2PO4 − dm−3 and the NH4 +:NO3 − ratio from 0:15 to 12:3, with a Hoagland...
  4. An inexpensive, portable rain simulator: construction and test data

    An inexpensive, portable rain simulator: construction and test data

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Construction details of an inexpensive, portable rain simulator are given. The dismountable components are easily transported on a light truck. The flat spray nozzles used produced rain with a >90% coefficient of uniformity over a 1-m2 test plot. Drop sizes...
  5. The influence of varying P concentrations on the yield and abnormalities of lettuce leaves

    The influence of varying P concentrations on the yield and abnormalities of lettuce leaves

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The effect of varying P concentrations on the growth, yield and development of leaf abnormalities, nutrient content and uptake of other nutrient elements was investigated for lettuce.Three cultivars (Chaparal, Wintercrisp and Robinvale) were studied in sand cultures and soil. The...
  6. Tolerance of six Namaqualand pioneer species to saline soil conditions

    Tolerance of six Namaqualand pioneer species to saline soil conditions

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Saline soils pose a great problem to reclamation of mined areas in arid regions. Experiments were carried out in order to determine the tolerance of six Namaqualand pioneer species to varying levels of salinity. Both perennial and ephemeral species were...
  7. A critical soil sulphur level for maize (<em>Zea mays</em> L.) grown in a glasshouse

    A critical soil sulphur level for maize (<em>Zea mays</em> L.) grown in a glasshouse

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Sulphur is an essential nutrient for the production of the amino acids cysteine and methionine, which are important for protein syntheses. Previous studies showed that sulphur deficiencies are becoming common because of the tendency to use more concentrated and liquid...
  8. Changes in inorganic and organic Phosphorus in soil under maize (<em>Zea mays</em>) cultivation

    Changes in inorganic and organic Phosphorus in soil under maize (<em>Zea mays</em>) cultivation

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The changes in applied and residual phosphorus (P) were examined in Avalon and Clovelly soils under cultivation by using the P fractionation method of Hedley, Stewart and Chauhan (1982). Soil P was separated into six major fractions of which some...
  9. Influence of residual manure on selected nutrient elements and microbial composition of soil under long-term crop rotation

    Influence of residual manure on selected nutrient elements and microbial composition of soil under long-term crop rotation

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A study was conducted on a long-term field experiment at the University of Pretoria, South Africa, that was established in 1939. The aim was to investigate the effects of residual manure on the characteristics of the total and microbial biomass...
  10. Soil nutrient contents, microbial properties and maize yield under long-term legume-based crop rotation and fertilization: a comparison of residual effect of manure and NPK fertilizers

    Soil nutrient contents, microbial properties and maize yield under long-term legume-based crop rotation and fertilization: a comparison of residual effect of manure and NPK fertilizers

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A study was conducted in a field experiment that has been ongoing for over 60 years at the University of Pretoria, South Africa. The aim was to compare the residual effects of manure and NPK fertilizers on selected soil nutrients,...