3 23 Hydroponics


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3 23 Hydroponics

  1. 1. Introduction to Horticulture Plant: Digitalis Term: Hydroponics
  2. 2. Foxglove Digitalis <ul><li>Plant type: Biennial, Herb, </li></ul><ul><li>USDA Hardiness Zones: 4a to 8a </li></ul><ul><li>Height: 2-5’ </li></ul><ul><li>Exposure: partial shade to full sun </li></ul><ul><li>Bloom Color: Pink, Purple, White </li></ul><ul><li>Bloom Time: Late spring to early summer </li></ul><ul><li>Landscape Uses: Border, Container, Massing, Specimen, Woodland garden </li></ul><ul><li>All or parts of this plant are poisonous </li></ul><ul><li>Suitable for cut flowers during 2 nd year </li></ul><ul><li>Extract used for heart medicine </li></ul>
  3. 3. Hydroponics <ul><li>The term &quot;hydroponics&quot; refers to growing crops without soil. </li></ul><ul><li>Inert medium, such as gravel, water, sand, peat. </li></ul><ul><li>A nutrient solution is added containing all essential elements needed by the plant. </li></ul><ul><li>Hydroponic production is very space intensive. </li></ul>
  4. 4. Uses <ul><li>Grow almost any herbaceous plant. </li></ul><ul><li>High value food crops or horticultural plants. </li></ul><ul><li>Commonly grown crops include lettuce, tomatoes, cucumbers and herbs. </li></ul><ul><li>The crop varieties grown hydroponically are bred specifically for greenhouse production. </li></ul>
  5. 5. COMMON HYDROPONIC METHODS <ul><li>Water culture: Crop roots are immersed or bathed in a continuous flow of nutrient solution. Often this is done in beds or troughs within a greenhouse. Tops of plants need supports. </li></ul>
  6. 6. COMMON HYDROPONIC METHODS <ul><li>Aggregate culture: </li></ul><ul><ul><li>Crop plants are grown in a solid media that provides anchorage and support much like soil does. </li></ul></ul><ul><ul><li>Materials often used as growing media include gravel, sand, perlite, soilless mixes , and rockwool. </li></ul></ul><ul><ul><li>The media is enclosed in beds, bags or blocks. </li></ul></ul><ul><ul><li>The nutrient solution is flooded or drip irrigated past the roots. </li></ul></ul><ul><ul><li>Plant top support is necessary for taller crops. </li></ul></ul>
  7. 7. ADVANTAGES OF HYDROPONICS <ul><li>Grow out of season or zone. </li></ul><ul><li>Grow at periods of lowest supply. Best prices. </li></ul><ul><li>Higher crop yields from smaller areas. Planting density is limited only by available light. </li></ul><ul><li>An example of comparative yields for tomatoes is: </li></ul><ul><ul><li>Soil grown: 5 to 10 tons per acre; </li></ul></ul><ul><ul><li>Hydroponic: 60 to 300 tons per acre. </li></ul></ul>
  8. 8. More ADVANTAGES <ul><li>Plants can mature faster and more evenly </li></ul><ul><li>Crops can be vine-ripened and sold immediately. </li></ul><ul><li>Soil-borne insect and disease problems are reduced </li></ul><ul><li>Crops do not need to be rotated. </li></ul><ul><li>Crops do not need to be cultivated or weeded. </li></ul><ul><li>Nutrient application timing and nutrient quantities can be custom tailored to a particular crop's specific needs. </li></ul>
  9. 9. DISADVANTAGES OF HYDROPONICS <ul><li>Costs </li></ul><ul><ul><li>The initial investment is high </li></ul></ul><ul><ul><li>Specialized equipment </li></ul></ul><ul><ul><li>Greenhouse heating can be quite expensive in the winter months. </li></ul></ul><ul><li>More skill is required than for traditional methods. </li></ul><ul><li>The grower/operator must be highly trained in plant nutrition and system operation and maintenance . </li></ul>
  10. 10. Movie <ul><li>Hydroponic lettuce </li></ul>
  11. 11. Fertilizer levels <ul><li>Monitored through EC readings </li></ul><ul><li>EC = electric conductivity </li></ul><ul><li>Gives a general reading of the solute content of a liquid </li></ul><ul><li>Each fertilizer is different </li></ul><ul><li>Read the label </li></ul><ul><li>Peters Excel = ? </li></ul>
  12. 12. Fertilizer Ratios <ul><li>Use water soluble fertilizer </li></ul><ul><li>Want ~ 50 ppm N for constant flow irrigation </li></ul><ul><li>Fertilizer is 20-10-20 </li></ul><ul><li>Tub holds 50 gal, how much fertilizer should be added? </li></ul><ul><li>Conversions </li></ul><ul><ul><li>1 PPM = .0038g/gal </li></ul></ul><ul><ul><li>28g = 1 oz </li></ul></ul>
  13. 13. Calculate <ul><li>1 PPM = .0038g/gal, 28g = 1 oz </li></ul><ul><li>1 ppm = .0038 ÷ 28 = ? oz/gal </li></ul><ul><li>1 ppm = .0001357oz/gal </li></ul><ul><li>50 ppm = 50 X .0001357 = ? Oz/gal </li></ul><ul><li>.006785oz/gal x 50 gal = ? Oz N </li></ul><ul><li>Fertilizer is 20% N </li></ul><ul><li>0 .34 oz of N ÷ 20% = ?oz total fertilizer </li></ul><ul><li>1.7 oz fertilizer </li></ul>
  14. 14. Our tanks <ul><li>Flow tube </li></ul><ul><li>Ebb & Flood beds </li></ul><ul><li>50 or 100 gal tanks </li></ul><ul><li>Weigh and add fertilizer </li></ul><ul><li>Check EC and compare </li></ul>