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© 2001 Paul Barlow
Feed Calculations

FEED RATES ARE CALCULATED IN PARTS PER MILLION (PPM)

  • 300ppm IS CONSIDERED A HIGH FEED RATE

  • 100ppm IS CONSIDERED A LOW FEED RATE

  • 200ppm IS CONSIDERED ABOUT RIGHT

The calculation is quite simple:

  • FIRST IDENTIFY THE NPK CONTENT OF YOUR FERTILIZER
  • eg AMMONIUM NITRATE IS 35% NITROGEN
  • TO CALCULATE A FEED OF 175ppm Nitrogen
  • (175ppm/35%) = 5x100 = 500 grammes
  • 500 grammes SHOULD BE ADDED TO 1000 LITRES OF WATER

As amateurs we are unlikely to require 1000 litres of liquid feed so the 500 grammes can be added to 5 litres of water to make a stock solution. This solution is then diluted at one part to 200 parts water.

I normally give each plant about one litre of the diluted liquid feed.

TO MAKE A BALANCED FEED OF 200ppm N AND 200ppm K

USING AMMONIUM NITRATE(35% N)   AND SULPHATE OF POTASH (50% K)

STEP 1 - NITROGEN CALCULATION:
 200/35 = 5.8 x 100 =580 grammes
 

 
STEP 2 - POTASH CALCULATION:
 200/50 = 4 x 100 =400 grammes
 

 
STEP 3 - MAKE UP STOCK SOLUTION:
 ADD 580 grammes OF AMMONIUM NITRATE AND 400 grammes SULPHATE OF POTASH TO 5 LITRES OF WATER
 

 
STEP 4 - DILUTE FOR USE: ADD ONE PART OF STOCK SOLUTION TO 200 PARTS WATER

The formula described above can be applied to any soluble fertilizer

If you would like further information or wish to comment on this publication please send your e-mail to: paul.barlow@chrysanthemums.info

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Last updated on 16 December, 2001