Sand hydroponics: An alternative 
technology for pre basic potato 
seed production.
By Daniel G. Mbiri  CIP SSA
d.mbiri@cg...
t
Introduction
In sub‐Saharan Africa just like the other humid tropical 
areas   Ralstonia solanacearum poses a serious 
c...
Aeroponics requires constant supply of electricity
In many Sub Saharan Africa countries there is
unreliable supply of elec...
Sodium hypochlorite bleach is cheaper than
steam boilers based technology
Sand hydroponics offers an alternative
technolog...
Sketch of simple screen house Sand hydroponics unit
Water source
A dependable source of clean water should be convenient.
A pH meter and an electric conductivity (EC) meter c...
Nutrient solution
Greenhouse grade fertilizers are used. The following can
constitute 1000 Liters tank:
1.potassium phosph...
Results and discussions (season one)
Clone Tubers per 
plant
Tube per M2
381381.13 Box 6 431
Local 
variety
Box 4.4 320
Lo...
• An intermediate technology
• In Sub Saharan Africa electricity supply is still low 
compared to western developed econom...
• Environmentally friendly
• Potato plants  from sand hydroponics are 
grown on sterile substrate and there is no 
effluen...
• Simplicity
• Costs Comparison of production costs per season
GREENHOUSE SYSTEM INITIAL COST ($) COST/SEASON ($)
Aeroponics 3,543.21 2...
• Conclusions
• Sand hydroponics is the technology of choice in sub‐
Saharan Africa
• To meet the increased demand for cle...
Recommendations
• Sand hydroponics technology to be replicated
in other countries
• Research works on side effects of sodi...
THE END 
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Sess10 2 daniel g. mbiri – sand hydroponics – an alternative technology for pre basic potato seed production

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Sess10 2 daniel g. mbiri – sand hydroponics – an alternative technology for pre basic potato seed production

  1. 1. Sand hydroponics: An alternative  technology for pre basic potato  seed production. By Daniel G. Mbiri  CIP SSA d.mbiri@cgiar.org (
  2. 2. t Introduction In sub‐Saharan Africa just like the other humid tropical  areas   Ralstonia solanacearum poses a serious  challenge to potato  seed production.  There has been an increase in consumption of potatoes One strategy for overcoming this challenge was to increase area under production and yields per unit area CIP intervened through introduction of aeroponics  technology in the year 2008 under the 3G technology Aeroponics technology revolutionized production of pre basic   seeds in sub‐Saharan Africa
  3. 3. Aeroponics requires constant supply of electricity In many Sub Saharan Africa countries there is unreliable supply of electricity and man power Sand hydroponics offers an alternative technology for clean pre basic potato seeds production Sand hydroponics uses ordinary sand sterilized with ordinary sodium hypochlorite bleach An elevated tank is used for the flow of nutrients solution by gravity.
  4. 4. Sodium hypochlorite bleach is cheaper than steam boilers based technology Sand hydroponics offers an alternative technology for clean pre basic potato seeds production. Materials and methods The screen house Sand hydroponics technology is screen house based technology. The screen house must have a water proof roof
  5. 5. Sketch of simple screen house Sand hydroponics unit
  6. 6. Water source A dependable source of clean water should be convenient. A pH meter and an electric conductivity (EC) meter can be used for monitoring EC and pH of the water Sand Sand that is too fine is not convenient as it compacts and limits root development. Sand recycling Sand can be recycled after one harvest. Ones through with harvest, all organic material (roots, stems, tubers) are removed and bleach is used just like on fresh sand.
  7. 7. Nutrient solution Greenhouse grade fertilizers are used. The following can constitute 1000 Liters tank: 1.potassium phosphate 136 g 2. Calcium Nitrate 236 g 3. Potassium nitrate 504 g 4. Magnesium Sulphate 100 g 5. Microsol B 12 g
  8. 8. Results and discussions (season one) Clone Tubers per  plant Tube per M2 381381.13 Box 6 431 Local  variety Box 4.4 320 Local  Variety pots 19.9 550
  9. 9. • An intermediate technology • In Sub Saharan Africa electricity supply is still low  compared to western developed economies.  Sand hydroponics promises an intermediate  technology . • Economically feasible • The use of easily available timber and sand  makes sand hydroponics a technology of choice  for seed production in sub‐Saharan Africa
  10. 10. • Environmentally friendly • Potato plants  from sand hydroponics are  grown on sterile substrate and there is no  effluent discharged into the environment • Simplicity of the technology • Sand hydroponics is so simple that any rural  group can implement on simple wooden  boxes or pot
  11. 11. • Simplicity
  12. 12. • Costs Comparison of production costs per season GREENHOUSE SYSTEM INITIAL COST ($) COST/SEASON ($) Aeroponics 3,543.21 2,273.32 Sand hydroponics ‐ beds 2,768.45 1,364.44 Sand hydroponics ‐ pots 908.04 878.41 Conventional ‐beds 13,308.81 1,795.82 Conventional ‐pots 10,556.84 1,039.42
  13. 13. • Conclusions • Sand hydroponics is the technology of choice in sub‐ Saharan Africa • To meet the increased demand for clean seeds Sand  hydroponics is the way forward • Sand culture is one of the most efficient and cost‐ effective methods of soilless culture • Sand hydroponics is new in the region and there are  prospects of replicating it to many community groups  and institutions within sub‐Saharan Africa.
  14. 14. Recommendations • Sand hydroponics technology to be replicated in other countries • Research works on side effects of sodium hypochlorite to be carried out • Research work on the number of times sand can be recycled • Both aeroponics sand hydroponics should be implemented simultaneously in SSA
  15. 15. THE END 

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