• Sampling and extraction methods for soil inorganic N determination to calibrate the EM38 in irrigated fields 

  Steenekamp, Diandra (University of the Free State, 2019-06)

  Precise management of N variability in crop fields are required to increase yields and ensure sustainable and economic crop production, whilst not having a negative impact on the environment. A popular type of sensor for ...

• Besproeibaarheid van gestruktureerde gronde 

  Nell, Johannes Petrus (University of the Free State, 1991-11)

  Afrikaans: Data van 333 profiele se fisiese (breukmodulus, infiltrasie, hidrouliese geleivermoë, lugwaterdeurlatendheidverhouding, waterretensie en Atterberggrense), chemiese (KUK, UNP, NAV, pH, elektriese weerstand, ...

• Biokatalitiese komponente in sade van enkele spesies uit die families Fabaceae en Caryophyllaceae 

  Du Plessis, Helena Aletta (University of the Free State, 2002-11)

  English: In the south of Germany it was observed that species of the families Fabaceae and Caryophyllaceae survived an unknown environmental catastrophy while this was not the case with plant species from other families ...

• The effect of nitrogen fertilisation on the growth, yield and quality of swiss chard (Beta vulgaris var. cicla) 

  Motseki, Pontso Christina (University of the Free State, 2008-05)

  English: The sustainability of subsistence farming associated with the health of rural communities’ necessitated research on Swiss chard as it forms an integral part of food consumed by the poor in developing countries. ...

• Organic matter restoration by conversion of cultivated land to perennial pasture on three agro-ecosystems in the Free State 

  Birru, Tilahun Chibsa (University of the Free State, 2002-01)

  English: Understanding the process of organic matter degradation and restoration is important with regard to sustainable agricultural production on any agro-ecosystem, and of particular importance where degradation is ...

• The effect of crop residue cover and soil texture on crusting 

  Massingue, Felicidade Isabel (University of the Free State, 2002-10)

  Large areas of cultivated soils throughout the world develop rainfall-induced soil crusts. The soil crusts are usually the cause of reduced seedling emergence. To have quantitative information on the factors influencing ...

• Studies oor die toeganklike fosforstatus van sekere Vaalhartsgronde 

  Eloff, Jacobus Frederick (University of the Free State, 1971-12)

  Afrikaans: Op die Vaalhartsbesproeiingskema is 30 veldproewe uit gelê om die toeganklike fosforstatus van die verteenwoordigende gronde te bepaal. Sitroensuur-P, Bray-P, Olsen-P, CAL-P en hars-P uit die grond geëkstraheer, ...

• Leaching of excess salts from the root zone of apedal soils 

  Barnard, Johannes Hendrikus (University of the Free State, 2006-05)

  English: In South Africa a huge amount of energy was spend on irrigation research over the past two decades, mainly to optimise water application in order to prevent crop water stress. In the quest to conserve water for ...

• Effect of liquid Maxiflo (Azospirillum SPP) and Trykoside (Trichoderma SPP) cultures on the growth and yield of selected crops 

  Mashamba, Nwagu Rodney (University of the Free State, 2006)

  English: The challenge for science is to address the need for adequate food provision and a sustainable future for agriculture. The solution for increasing food production can probably only be obtained through expansion ...

• The influence of land use on humic substances in three semi-arid agro-ecosystems in the Free State 

  Akhosi-Setaka, Makuena Cynthia (University of the Free State, 2009-05)

  English: This study was initiated to complement earlier investigations into soil organic matter degradation and restoration on account of agricultural land use in the Free State Province of South Africa. In these studies ...

• The role of ferrolysis in the genesis of selected soils of the Eastern Free State 

  Macheli, Malerata Suzan (University of the Free State, 2007-11)

  English: Plinthic and duplex soil forms make up a substantial part of the soils under cultivation in South Africa. The tendency of these soils to occur either in isolation, or in association with one another, leaves the ...

• Yield and fruit quality assessment of cactus pear (Opuntia ficus-indica (L.) Mill.) treated with natural bio-stimulants 

  Buitendag, R. A. (University of the Free State, 2004-11)

  English: In arid and semi-arid regions of South Africa, both subsistence and commercial farmers experience economic pressure due to varying prices of staple crops such as maize and wheat as well as weather uncertainties. ...

• The effect of water quality on the growth and yield of irrigated crops 

  Dikgwatlhe, Shadrack Batsile (University of the Free State, 2006-05)

  English: Salinity is a major limitation and threat sustainable crop production in South Africa and elsewhere in the world. An intensive study by Du Preez et al. (2000) on the water quality of the lower Vaal River system ...

• Evaporation from aeolian soils with shallow water tables 

  Mengistu, Achamyeleh Girma (University of the Free State, 2016-02)

  Soil water evaporation under water table conditions was identified as a very important water loss in the soil water balance in aeolian soils. Globally it is estimated that 7.2 × 1013 m3 of water lost through evapo-transpiration ...

• Downscaling of global circulation model predictions to daily rainfall over the upper Olifants River catchment 

  Steyn, Abraham Stephanus (University of the Free State, 2008)

  English: Climate change could have far reaching consequences for all spheres of life. Continued greenhouse gas (GHG) emissions at or above current rates will cause further warming and induce further changes in the global ...

• The compaction susceptibility of soils in the Free State 

  Nhantumbo, Alfredo Bernardino Julio Da Costa (University of the Free State, 1998-12)

  Crop production in the Free State is mainly performed on sandy soils. The compaction of these apedal soils can present a management problem which affects crop yields and financial returns. In addition, environmental ...

• Grondversuring en bekalking van Oos-Vrystaatse gronde onder droëlandkoring 

  Van Zyl, Hendrik Johannnes Jakobus (University of the Free State, 2003-04)

  English: The value of liming of agricultural land has been demonstrated all over the world during the past century. Therefore liming as an agro-economical practice has been adopted widely by farmers with a beneficial ...

• Quantifying spatio-temporal soil water content using electromagnetic induction 

  Edeh, Judith Amarachukwu (University of the Free State, 2017)

  Water scarcity is still a global concern, and the fact that water is not evenly distributed within the soil remains a case study in agriculture. Apparent electrical conductivity (ECₐ) measured with the EM38 devices have ...

• Soil quality of kikuyu, ryegrass and clover pasture mixtures in the Tsitsikamma 

  Phohlo, Motsedisi Portia (University of the Free State, 2016)

  South African soils have long been classified as being severely degraded. The state of the soils is even more pronounced in sandy soils that are managed for pasture production in the Tsitsikamma region. This is mainly due ...

• Evaluation of salinity and irrigation guidelines for lucerne 

  Fourie, Kevin Louis (University of the Free State, 2017-02)

  Evaluation of salinity and irrigation guidelines for lucerne remains important to improve current management practices under irrigation. Internationally, well-established yield response curves, set over 30 years ago, serves ...

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