Alternatives to Alternative Methods: Soil Farming Soiless Farming Hydroponics • Hydroponics Hydroponics: cultivating plants using mineral nutrient solutions dissolved in water. Substrates used: Hydroponics Hydroponics: cultivating plants using mineral nutrient solutions dissolved in water. Substrates used: - Only water - Perlite - Gravel - Expanded clay - Mineral wool - Coconut husk Hydroponics Where is it used: -NASA: possibility of growing plants in large space stations or on other planets. Hydroponics Where is it used: -NASA: possibility of growing plants in large space stations or on other planets. - Greenhouses: most of the lettuce you eat is grown hydroponically. Hydroponics Where is it used: -NASA: possibility of growing plants in large space stations or on other planets. - Greenhouses: most of the lettuce you eat is grown hydroponically. - Laboratories: you can control more variables (amount of nutrients, pH) Advantages of a Hydroponic System • No soil needed • Water can be reused many times before it needs to be flushed = saves water Advantages of a Hydroponic System • No soil needed • Water can be reused many times before it needs to be flushed = saves water • Can control plant nutrition (it is only in the water if you put it there) • High yields • Ease of harvesting Disadvantage of Hydroponics • If something goes wrong with the water all the plants are effected = may lose whole crop • There is no soil to buffer changes: Disadvantage of Hydroponics • If something goes wrong with the water all the plants are effected = may lose whole crop • There is no soil to buffer changes: eg. In soil pH drops in soil breaking down calcium rock which brings the pH back up. Without a buffer the pH can rise and fall uncontrollably which might kill the plants Two Main Types of Hydroponics Solution Hydroponics: Uses only water with dissolved nutrients Solute: Solvent: Medium Hydroponics: Eg: use gravel = use rockwool = Two Main Types of Hydroponics Solution Hydroponics: Uses only water with dissolved nutrients Solute: a substance that is dissolved = fertilizer Solvent: Used to dissolve solute = solvent Medium Hydroponics: Eg: use gravel = use rockwool = Two Main Types of Hydroponics Solution Hydroponics: Uses only water with dissolved nutrients Solute: a substance that is dissolved = fertilizer Solvent: Used to dissolve solute = solvent Medium Hydroponics: Uses a solid substance for the roots. Named after the type of solid they use. Eg: use gravel = gravel culture use rockwool = rockwool culture Other Forms of Hydroponics Static Solution Culture: Most common form used in personal gardens. Parts: - Other Forms of Hydroponics Static Solution Culture: Most common form used in personal gardens. Parts: -Bucket with lid -Airline to aerate water -Basket for plants -Water soluble nutrients Other Forms of Hydroponics Continuous flow Solution Culture: A thin constant stream of nutrient rich water passes the root system of the plants. Parts: - Other Forms of Hydroponics Continuous flow Solution Culture: A thin constant stream of nutrient rich water passes the root system of the plants. Parts: -Pipes with holes or buckets attached to them -Large container of water -Pump system that moves water from the container through the pipes -Water soluble nutrients Nutrients Needed for Hydroponics Nutrients Needed for Hydroponics Nutrients Needed for Hydroponics Nutrients Needed for Hydroponics Nutrients Needed for Hydroponics Assignment Article and Questions • Aeroponics Aeroponics Aeroponics: Aero = air Growing plants without the use of soil or aggregates. Water and nutrients are brought to the roots by mist or humidity. Aeroponics Basic Aeroponics System: - Plants are grown on a support structure (mesh or mesh baskets). Roots grow out the bottom and hang in a closed off space - Roots are sprayed with fertilized water by spray bars or mist bar