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Hydroponics Farming PowerPoint Presentation

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Slide 1 - HYDROPONICS Technology Systems Mr Gembar
Slide 2 - Imagine ??? Imagine harvesting tomatoes, basil and peppers from your garden in the middle of winter. Or, how about growing fresh produce all year long at home without ever having to lift, stoop or pull a weed? Hydroponics involves growing plants in a soil less medium, usually perlite, rock wool or gravel, using a small pump to circulate nutrient-laden water through the root system. Grow lights are used with indoor gardens. Because plants can be grown on tables, hydroponics gardening is ideal for wheelchair users, the elderly or those with any number of physical disabilities.
Slide 3 - History Of Hydroponics Although hydroponics today involves tables, pots, pumps, and high tech lights for indoor gardens, it is nothing new. It is a technique that was used by the ancient Mayans and Babylonians. The word was derived from the Greek words, HYDRO (water), and PONOS (labor), literally, “water working”. Hydroponics became popularized by the news media in the 1920s when a scientist named Dr. William F. Gericke of the University of California when he put laboratory experiments in plant nutrition on a commercial scale. In doing so he termed these nutriculture systems HYDROPONICS.
Slide 4 - The advantages of hydroponics are significant including: - Superior taste, quality, appearance, uniformity, and extended shelf life of hydroponic vegetables. - No sterilization of growing media required and plant nutrition is easily and completely controlled within the nutrient reservoir. - No weeding, no cultivation, no soil borne diseases or insects. Allows uniform water availability to plants. - Closer plant spacing is possible and movable plant channels allow greater production from equal areas. - Less water required and less fertilizer needed, and root zone heating and cooling is made possible.
Slide 5 - Wick System The Wick system is by far the simplest type of hydroponic system. This is a passive system, which means there are no moving parts. The nutrient solution is drawn into the growing medium from the reservoir with a wick. The biggest draw back of this system is that plants that are large or use large amounts of water may use up the nutrient solution faster than the wick(s) can supply it.
Slide 6 - Water Culture The water culture system is the simplest of all active hydroponic systems. The platform that holds the plants is usually made of Styrofoam and floats directly on the nutrient solution. An air pump supplies air to the air stone that bubbles the nutrient solution and supplies oxygen to the roots of the plants.   The biggest draw back of this kind of system is that it doesn't work well with large plants or with long-term plants.
Slide 7 - EBB AND FLOW (FLOOD AND DRAIN) The Ebb and Flow system works by temporarily  flooding the grow tray with nutrient solution and then draining the solution back into the reservoir. This action is normally done with a submerged pump that is connected to a timer.  The main disadvantage of this type of system is that with some types of growing medium (Gravel, Growrocks, Perlite), there is a vulnerability to power outages as well as pump and timer failures. The roots can dry out quickly when the watering cycles are interrupted. This problem can be relieved somewhat by using growing media that retains more water (Rockwool, Vermiculite, coconut fiber or a good soiless mix like Pro-mix or Faffard's).
Slide 8 - EBB & Flow System On/Off When the timer turns the pump on nutrient solution is pumped into the grow tray. When the timer shuts the pump off the nutrient solution flows back into the reservoir. The Timer  is set to come on several times a day, depending on the size and type of plants, temperature and humidity and the type of growing medium used.
Slide 9 - Drip System Drip systems are probably the most widely used type of hydroponic system in the world. Operation is simple, a timer controls a submersed pump. The timer turns the pump on and nutrient solution is dripped onto the base of each plant by a small drip line. In a Recovery Drip System the excess nutrient solution that runs off is collected back in the reservoir for re-use. The Non-Recovery System does not collect the run off.
Slide 10 - N)utrient (F)ilm (T)echnique The nutrient solution is pumped into the growing tray (usually a tube) and flows over the roots of the plants, and then drains back into the reservoir. N.F.T. systems are very susceptible to power outages and pump failures. The roots dry out very rapidly when the flow of nutrient solution is interrupted. There is usually no growing medium used other than air, which saves the expense of replacing the growing medium after every crop. Normally the plant is supported in a small plastic basket with the roots dangling into the nutrient solution.
Slide 11 - AEROPONIC The aeroponic system is probably the most high-tech type of hydroponic gardening. The roots hang in the air and are misted with nutrient solution. The mistings are usually done every few minutes. The aeroponic system needs a short cycle timer unlike other systems that runs the pump for a few seconds every couple of minutes. Because the roots are exposed to the air like the N.F.T. system, the roots will dry out rapidly if the misting cycles are interrupted.
Slide 12 - Hydroponic System (Drainage) Students are required to check the system for proper drainage before, during, and after plant growth. Many times roots and loose pipe fittings are to blame for water damage/ overflow. Maintenance of this system is crucial because water can do so much damage
Slide 13 - Hydroponic System (pH Level) Students are required to monitor the system for appropriate pH level during plant growth. Students will manage the system by adjusting the pH levels. Good pH levels for vegetable growth can be found in Hydroponics packet, 5.5-6.0.
Slide 14 - Hydroponic System (Light) Students will need to manage the light system. They will need to check for proper travel on the rail so the entire system receives light. Checking for a good bulb needs to be done under supervision because of the intense heat and danger of glass.
Slide 15 - Hydroponic System (Nutrients) Students are required to monitor the system for appropriate nutrient during plant growth. Students will manage the system by adjusting the nutrient values. Students will need to note the growth period for appropriate nutrient mixtures.
Slide 16 - Thank You
 

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