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» Economics » Technology in the horticulture » Topics begins with G » Greenhouse computer

Page modified: Thursday, July 14, 2011 01:28:20

Greenhouse computers serve to create the plants in the greenhouse optimal growth conditions. In addition the most important growth factors - depending upon equipment and culture procedure also only some these factors - are affected by air conditioning, irrigation automation and controlling of the fertilization. Goals are about to interlace by the computer as much as possible information with one another to use resources economically expensive culture errors to avoid and the plant continuously to supervise as well as persons against accidents to protect.

Climatic computer

Climatic computers in the greenhouse are connected with a Wetterstation in the external area as well as sensors in the greenhouse for the collection of the current climatic values. Limit value injuries and plant disturbances are supervised and to lead to alarm. The measured values are continuously evaluated by appropriate control programs. The climatic factors are optimized by control of automation mechanisms.

Irrigation computer

Irrigation computers evaluate the climatic factors, in order to optimize the irrigation time and the quantity of water. In connection with plants to the the water quality can be supervised and optimized by measurement of the conductivity and the pH value.

Climatic factors in the greenhouse

Substantial climatic factors, which are supervised and optimized by greenhouse computers, are:

  • the irradiation - plants need light in the correct intensity and duration;
  • the air temperature - in the greenhouse the temperatures are justifiable only by regulation;
  • the air movement - wind can damage plants in the greenhouse strongly;
  • the relative humidity - with to high humidity the risk of infection grows by fungal attack;
  • the CO2-Konzentration of air - is an important factor for photosynthesis;
  • the soil dampness, or substrate dampness - must be optimized for plant growth;
  • - can be given in the context of irrigation automation;


The following meteorological measured variables are evaluated:

  • Wind velocity: Bowl star anemometer;
  • Wind direction: Wind direction giver;
  • Irradiation: Lux meter or radiation sensor for photometry and dawn time;
  • Outside temperature: to the optimization of heating and ventilation and possibly cooling;
  • Precipitation: Rain sensor for closing the ventilation and possibly Schneeabtauung;
  • Outside air dampness: particularly for enthalpy selection program/adiabatic cooling;

Sensors in the greenhouse

In the greenhouse sensors for the following measured variables are used:

  • Air temperature: Measurement of the temperature in the plant existence, approximately in house center;
  • Soil temperature: with cabin ground heating systems (prevention of overheating within the root range);
  • Humid one: Measurement of the relative humidity in the plant existence;
  • Interior luminous intensity: to the optimization of lighting systems;
  • CO2-Konzentration: importantly also for observance of MAK values for persons;
  • Soil dampness: Measurement in the root area of the culture and possibly control of infiltration;
  • pH value of nutritive solutions: importantly with hydraulic cultures and groundless culture procedures;
  • Conductivity of nutritive solutions: to the optimization of the nutrient gifts;

Automation mechanisms

the climatic factors are affected by greenhouse computers by means of the following control members:

Temperature control

  • Heating regulation: Control of pumps, mixers, heating cannons, air heaters;
  • Ventilation regulation: Control of ventilation flaps, fans;
  • Cooling: Control of spray nozzles (adiabatic cooling) or


  • Schattiereinrichtungen: Avoidance to high irradiation, energy screen in the night enterprise;
  • Black-out screens: Controlling of the daily length for bloom induction with ornamental plants;
  • Exposure plants: Controlling of the daily length and increased returns, predominantly in the winter;

Humid one

  • Air humidification/spray plants: Decrease of the of the sheets;
  • Dehumidifying by cooling and heating: Prevention of Blattkrankheiten;


  • CO2-Begasungsanlagen: Optimization of the CO2 of offer for the plants;
  • Natural gas heating cannons: Coupling of heating and CO2 offer;

Irrigation, fertilization

  • Irrigation automation: Control of pumps and single solenoid valves to the irrigation;
  • Fertilization proportioning plants: Control of dosing systems, pumps, single solenoid valves;


  • Christian von Zabeltitz: Greenhouses, Stuttgart 1986, ISBN 3-8001-5130-8
  • Tantau: Heating systems in the horticulture, Stuttgart 1983, ISBN 3-8001-5123-5
  • Harmen Storck: Paperback of the building of gardens, Stuttgart 1983, ISBN 3-8001-4112-4

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