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Computer model of hydroponics nutrient solution pH control using ammonium.

M Pitts1, G Stutte

  • 1Biological Systems Engineering, Washington State University, Pullman 99164-6120, USA. pitts@wsu.edu

Life Support & Biosphere Science : International Journal of Earth Space
|September 7, 2001
PubMed
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This study simulated ammonium-based pH control in hydroponics, finding it feasible for plant growth chambers. Careful monitoring is key to avoid over-dosing plants with ammonium.

Area of Science:

  • Agricultural Engineering
  • Plant Science
  • Environmental Science

Background:

  • Recirculating hydroponics systems typically see pH rise due to plant hydroxide ion release.
  • Traditional pH control methods can be complex in controlled environments.
  • Ammonium (NH4+) offers a potential alternative by leveraging plant nutrient uptake mechanisms.

Purpose of the Study:

  • To assess the feasibility of using ammonium for pH control in a hydroponics-based plant growth chamber.
  • To model the impact of ammonium on plant growth, nitrogen uptake, and nutrient solution pH.
  • To evaluate ammonium as a pH control agent in Advanced Life Support Systems (ALSS).

Main Methods:

  • Development of a computer simulation for a hydroponics-based plant growth chamber.
Keywords:
NASA Center KSCNASA Discipline Life Support Systems

Related Experiment Videos

  • Modeling of wheat growth, nitrogen uptake, and pH dynamics.
  • Implementation of a proportional integral controller for ammonium-based pH regulation.

    • Main Results:

    • The simulation demonstrated the feasibility of ammonium-based pH control.
    • Wheat growth, nitrogen uptake, and pH were successfully modeled.
    • A 1 mmol/L buffer (Ka = 1.6 x 10^-6) was found necessary in the nutrient solution.

    Conclusions:

    • Ammonium can be effectively used for pH control in hydroponic systems.
    • This method exploits natural plant charge balance mechanisms.
    • Successful implementation requires precise monitoring and control to prevent ammonium toxicity.