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A Bit Of Arithmetic
Brand Names
Fertilizer Control
Necessity Of Purchase
Statement Of Analysis
Valuation Of Fertilizers


Crops And Methods For Soil Improvement

A Clean Seed-bed
A Few Combinations Are Safest
A Practical Test
A Southern Legume
A Three Years' Rotation
Acid Phosphate
Acquaintance With Terms
Adaptation To Eastern Needs
Affecting Physical Condition
All The Nitrogen From Clover
Alsike Clover
Amount Of Application
Amount Of Manure
Amount Per Acre

Statement Of Analysis

It would be well if the law refused to the
manufacturer the privilege of printing unnecessary detail in the
statement of analysis that must be placed upon the fertilizer bag. It
is added to confuse the buyer and mislead him regarding actual value.
The following statement is an example of this practice:


Per Cent
Nitrogen 0.82 to 1.00
Equal to ammonia 1.00 to 2.00
Soluble phosphoric acid 6.00 to 7.00
Reverted 2.00 to 3.00
Available 8.00 to 10.00
Insoluble 1.00 to 2.00
Total 9.00 to 12.00
Potash (actual) 1.00 to 2.00
Equal to sulphate of potash 2.00 to 3.00

As the row of larger figures is not guaranteed percentages, it has no

The buyer is not concerned regarding the amount of ammonia to which the
nitrogen is equal, and so the second line is a needless repetition.

The fifth line gives the sum of the third and fourth, the available
being the total of the soluble and reverted. Therefore the third and
fourth lines may be ignored.

The sixth line gives the percentage of unavailable phosphoric acid in
the rock, and should be ignored by the purchaser who wants available

The seventh gives the sum of the available and insoluble, and should be

The ninth is a restatement of the eighth line.

There then remains the following guaranty:

Per Cent
Nitrogen 0.82
Available phosphoric acid 8.00
Potash 1.00

This is a low-grade fertilizer whose cheap character becomes apparent
when the unnecessary statements and restatements are erased. A ton of
it contains only 16 pounds of nitrogen, 160 pounds of phosphoric acid,
and 20 pounds of potash.

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