 Fertilizer Terms
 Calculations
 Fertilizer Terms
 Fertilizer: any substance which is added to the
soil ( or sprayed on plants) to supply those elements required in plant
nutrution.
 Fertilizer Material or Carrier: a material which
contains at least one plant nutrient.
 Mixed Fertilizer: a fertilizer which contains 2
or more of the primary elements  N, P, K.
 Fertilizer Grade: minimum guarantee of plant nutrient
content in fertilizers in terms of total N. available P_{2}0_{5},
and available K_{2}0; in that order. ex. 51010
 this amount of nutrients in these fertilizers is regulated by
law. What they say is in the bag must really be there. This was
not always the case years ago.
 This grade is the guaranteed minimum content.
 If you have a 61218
Then you have, in 100 lbs, 6 lbs N. 12 lbs P_{2}0_{5}, and 18 lbs K20.
 The nutrients are not present in the oxide forms but this is
the method used in reporting them
 fertilizer recommendations are made in terms of N, P_{2}O_{5}, and K_{2}O. These are usually called nitrogen, phosphate, and potash.
 this amount of nutrients in these fertilizers is regulated by
law. What they say is in the bag must really be there. This was
not always the case years ago.
 Fertilizer ratio: the relative amounts of N, P_{2}O_{5},
and K_{2}O in fertilizers.
Grade Ratio 51010 122 399 133 4812 123
 Filler: a material added to a mixed fertilizer to
finish out weight requirements in a ton  commonly use ground lime.'
Example: ton of 088
add 0200 superphosphate 800 lbs add 0060 muriate of potash 267 lbs filler 933 lbs total 2000 lbs or 1 ton
 Fertilizer: any substance which is added to the
soil ( or sprayed on plants) to supply those elements required in plant
nutrution.

Calculations

How much of a given fertilizer is needed to provide a given amount of nutrient?

Fertilizer recommendations of 100 lbs of P_{2}O_{5}.
How much concentrated superphosphate(0460) is needed?

If 120 lbs K_{2}O is needed, how much 0060 must you apply?

It has been recommended that 120 lbs of N per acre be sidedresses on corn for achieving maximum yields.
You could use ammonium nitrate (which contains 33.5% N) for this purpose.
How much material will you need to use?
What about using sodium nitrate, urea, and anhydrous ammonia?

Your soil test report recommended that 100 lbs pr acre of P_{2}O_{5} be applied? You can
buy triple superphosphate (45% P_{2}O_{5}). How many lbs/A will you need to apply?
How much regular superphosphate (0200) would be required for the same recommendation?

How many gals of 30% N solution will you need per A to supply 160 lb N/A on corn?
1 gal 30% N weighs 10.8 lbs
 8 lb of 51218 to be applied. How much N, P_{2}O_{5} and K_{2}O are we really applying?

How much of a given fertilizer is needed to provide a given amount of nutrient?