Hello William,

I have tried to find the Researchgate links where possible, in case you wanted to contact the authors.

This ResearchGate member is based in Pretoria, and has papers regarding subject:

Martin Makgose Maboko, PhD Horticultural Science, Researcher, Agricultural Research Council, Pretoria · Division of Crop Science (VOPI)

https://www.researchgate.net/profile/Martin_Maboko/publications

These are conference papers by Martin and his co-authors:

Du Plooy, C. P., Maboko, M. M., Van den Heever, E., & Chiloane, S. (2012). Research and technology transfer by the Agricultural Research Council to sustain the South African hydroponic industry. Acta Horticulturae, (947), 147.

https://www.researchgate.net/publication/259080384

Maboko, M. M., & Du Plooy, C. P. (2009). Effect of stem and fruit pruning on yield and quality of hydroponically grown tomato. In African Crop Science Conference Proceedings (Vol. 9, pp. 27-29).

https://www.researchgate.net/publication/259080279_Effect_of_stem_and_fruit_pruning_on_yield_and_quality_of_hydroponically_grown_tomato

Nxawe, S., Laubscher, C. P., & Ndakidemi, P. A. (2009). Effect of regulated irrigation water temperature on hydroponics production of spinach (Spinacia oleracea L.). African Journal of Agricultural Research, 4(12), 1442-1446.

https://www.researchgate.net/profile/Charles_Laubscher/publication/228480198_Possible_effects_of_regulating_hydroponic_water_temperature_on_plant_growth_accumulation_of_nutrients_and_other_metabolites/links/5416fa550cf2788c4b35f9de.pdf

I thought this was of interest, but could not access the online reference:

http://www.nda.agric.za/docs/Brochures/prodGuideHydroVegL.pdf

Likewise, I could not access ref. 6, that looked relevant, in this paper:

Wahome, P. K., Oseni, T. O., Masarirambi, M. T., & Shongwe, V. D. (2011). Effects of Different Hydroponics Systems and Growing Media on the Vegetative Growth, Yield and Cut Flower Quality of Gypsophila (Gypsophila paniculata L.). World Journal of Agricultural Sciences, 7(6), 692-698.

at: https://www.researchgate.net/publication/265819873

Very best wishes with your project,

Mary

Article Possible effects of regulating hydroponic water temperature ...

Conference Paper Effect of stem and fruit pruning on yield and quality of hyd...

Article Research and Technology Transfer by Agricultural Research Co...

Article Effects of Different Hydroponics Systems and Growing Media o...

Thank you so much Mary. I appreciate.

There is likely to be additional, unpublished information about projects led by international agencies, such as CIAT, This should be available in project reports, Paul.