Nutrient Delivery is Controlled in Hydroponics

Nutrient Delivery is Controlled in Hydroponics 2
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EdwardCage,Bahamas,Professional
Published Date:08-07-2017
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Eric  Cook   ericccookyahoo.com   1 eccookAlaska.edu   907-­‐460-­‐1316   Hydroponics NUTRIENT MANAGEMENT FOR HYDROPONICS 2 Nutrient Delivery is Controlled in Hydroponics u  No complex Soil Chemistry u  Controlled Nutrient Application u  Standard media behavior u  Less complex biological interactions u  The plant only gets what you give it 3 Fertilizer u Premixed with Micronutrients or u Individual Chemicals 4 Mixing Chemical by Chemical u  Specifically Tailored for your needs based on local water quality u  Should minimize waste and create the most idea nutrient solution for ideal plant growth u  More complicated and chances for errors u  More adaptable for nutrient adjustments u  Usually 2 or 3 Concentrate Tanks http://3.imimg.com/data3/NL/XE/MY-7044661/ nitrogen-fertilizer-500x500.png Example of using Elemental Fertilizers 5 Table 1 & 2 - Pepper Formulation Element Concentration (ppm) Fertilizer Source Macronutrients Macronutrients Fe 1.5-3.0 Iron Chelate (FeDTPA) NO3-N 190 Calcium Nitrate Calcium Nitrate/ NH4-N 18 Manganese Sulfate/ Ammonium Nitrate Mn 0.55 Manganese Chelate Monopotassium P 40 Phosphate Monopotassium Zinc Sulfate/ Zn 0.33 K 340 Phosphate/ Zinc Chelate Potassium Sulfate B 0.33 Boric Acid/Solubor Ca 170 Calcium Nitrate Mg 50 Magnesium Sulfate Cu 0.05 Copper Sulfate Potassium Sulfate/ Sodium or Ammonium Magnesium Sulfate SO4 360 Mo 0.05 Molybdate http://www.howardresh.com/hydroponic-culture-peppers2.html 6 How do you know what and how much to of each fertilizer to use? u  Usually you send a water sample results to a company, who recommends a formula u  There are programs u  If you like chemistry, you can figure it out. http://i.ytimg.com/vi/vYv9iu2NI3M/maxresdefault.jpg 7  Premixed u  Simple & Straight Forward u  Easier to make less mistakes u  Works Well but is not tailored to the Location 8 Fertilizer: Tank 1 - everything without nitrogen Premixed Formula with Micronutrients Magnesium Sulfate 9 Fertilizer: Tank 2 – Calcium Nitrate & Potassium Nitrate Potassium Nitrate Calcium Nitrate CHEM-GRO CUCUMBER FORMULA 8-16-36   10 Sample GUARANTEED ANALYSIS   Total Nitrogen (N) ……………………………………………………8.00% Nitrate Nitrogen………………………………………………………..7.00% premixed Ammoniacal Nitrogen…………………………………………………1.00% Available Phosphoric Acid (P205)………………………………16.00% Soluble Potash (K20)……………………………………………… 36.00%   formula for TRACE ELEMENTS   cucumbers Boron as (B) …………………………………………………………….0.05% Copper as (Cu)………………………………………………………… 0.05% Iron (Chelated) as (Fe).. ……………………………………………..0.20% Total Manganese as (Mn)…………………………………………….0.10% Soluble Manganese as (Mn) ………………………………………..0.10% Molybdenum (Mo) …………………………………………………….0.01% Analysis and Zinc (Zn) ………………………………………………………………….0.05%   Ingredients Derived From: Potassium Nitrate, Potassium Phosphate, Ammonium Phosphate, Potassium Sulfate, Sodium Borate, Copper Sulfate, Iron DTPA, Molybdic Acid, Manganese Sulfate, & Zinc Sulfate.   https://hydro-gardens.com/product/cucumber-formula-25lbs-bag-8-16-36/ Lettuce  Fertilizer  –  Re.illing  the  Stock  Tanks   11   Mixing  Instructions:     When  the  30  gallon  concentrate  tanks  are  empty,   rinse  and  clean  them.  Excess  fertilizer  can  be  placed   in  small  buckets  and  distributed  onto  the  gardens,   even  in  the  winter.  It  is  better  for  the  environment   then  dumping  it  down  the  drain.  Certain  fertilizers   cannot  be  mixed  together,  so  there  are  two  tanks.      12 Stock Tank Mixing Continued Weigh  the  fertilizers.  Place  the  scale  on  a  sold  surface.  Zero  the  scale   with  the  empty  bucket  that  will  hold  the  fertilizer.  You  will  need  three   clean  buckets.  Weigh  each  of  the  fertilizers  into  a  separate  bucket.  Weigh   out:       Tank  A:      15  lbs  -­‐  Chem-­‐Gro  Lettuce  Formula  8-­‐15-­‐36                9.3  lbs  -­‐  Magnesium  Sulfate  -­‐  Epsom  Salt  (EpsoTop)         Tank  B:  15  lbs  –  Calcium  Nitrate  (Calcinit)  13 Stock Tank Mixing Continued Start  .illing  Tank  A  with  water.  Once  you  have  some  water  in  the  tank,  add  the  Lettuce  Chem-­‐Gro.  Stir   VIGUROUSLY.  Then  add  the  Magnesium  Sulfate.  Stir  VIGUROULY.  It  is  important  to  get  the  fertilizers   dissolved.    Stir  during  the  whole  time  that  the  water  is  Pilling.  Don’t  let  the  water  get  too  high  before   you  get  the  fertilizer  all  dissolved,  since  it  can  be  hard  to  get  it  fully  mixed  without  it  sloshing  the   solution  over  the  top,  if  the  tank  is  nearly  full.  Top  it  off,  as  high  as  you  can,  while  still  being  able  to  put   the  lid  back  on  without  overPlowing  the  tank.       Tank  A:      15  lbs  –  Chem-­‐Gro  Lettuce  Formula  8-­‐15-­‐36                    9.3  lbs  -­‐  Magnesium  Sulfate  -­‐  Epsom  Salt  (EpsoTop)       Start  .illing  Tank  B  with  water.  Once  you  have  some  water  in  the  tank,  add  the  Calcium  Nitrate   (Calcinit).  Stir  VIGUROULY.  It  is  important  to  get  the  fertilizer  dissolved.    Stir  during  the  whole  time   that  the  water  is  Pilling.  Don’t  let  the  water  get  too  high  before  you  get  the  fertilizer  all  dissolved.  Top  it   off,  as  high  as  you  can,  while  still  being  able  to  put  the  lid  back  on  without  overPlowing  the  tank.   Tank  B:    15  lbs  –  Calcium  Nitrate  (Calcinit)  14 Daily Testing u  Test EC u  Test pH u  Test 2-3 times a day on an NFT System, unless your systems automatic injection is very reliable, then less often. u  If your injectors are reliable on a Dutch bucket system; you can check once or twice a week or even less. http://www.myronlmeters.com/v/ vspfiles/photos/DH-UMII-6PII-2T.jpg Recommended EC & PH 15 u  LETTUCE - EC should be 1700 µS (1.7 mS). The recommendation from Hydro-Gardens for the Lettuce Formula is a pH of 6.0-6.5. Other sources recommend a pH 5.5-5.8 in typical NFT systems. u  TOMATO - Test the water coming out of the spray stakes. It should come out at pH 6.2 and have an EC(cond.) of 1700 – 1900 µS. u  CUCUMBER - I have found that the European Cucumbers we grow are very vigorous and in order to prevent deficiencies and maximize production we need an EC of 2500 µS. The pH should be 6.4-6.7. 16 Electrical Conductivity (EC) mS u Varies by formulation and crop u Usually from 1500 – 2500 µS plus source water u Ex) Cucumbers like a high EC around 2500 µS u Ex) Lettuce and Tomatoes both like it around 1700 µS http://kuvat.verkkokauppaan.fi/kuvat/213/t133199/ truncheon.jpg 17 pH Testing u Usually a pH of 5.5 to 6.5 in Hydroponics is fine(soil pH is often Ideally higher) u Different plants and solutions have different ideal target ranges u Follow Label if you are using a premixed formula u Check NFT Systems 2-3 times a day http://www.petco.com/assets/product_images/ 3/317163001288D.jpg 18 What Can you test with? u  EC Meters, pH Meters, Combo Meters u  EC meters that can be calibrated u  EC Dip Sticks u  pH Color Chart Test Kits https://4hydroponics.com/images/products/ blueLabCombo.jpg 19 What is pH? u  pH is the measure of acidity/alkalinity of a solution.  u  Specifically, pH is a measure of the hydronium ion H3O+. It is based on a logarithmic scale from 0 to 14. "Pure" water has a pH of 7.0. If the pH is less than 7, the solution is acid. If the pH is greater than 7 it is alkaline. Because the scale is logarithmic and not linear, a pH of 6 indicates ten times more H protons than a pH of 7, and a pH of 5 indicates 10 times more protons than a pH of 6.  http://generalhydroponics.com/site/index.php/ resources/faqs/ph_dynamics_and_adjustment/ 20 Why does pH matter? u  It affects nutrient availability http://www.bghydro.com/media/wysiwyg/BGH/ blog/no-stress-ph-tds/tdsph.gif