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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

A Bit Of Arithmetic

This paragraph is intended to serve the man who
is willing to be reasonably near right if he cannot be wholly so: A ton
is 2000 pounds, and one per cent is 20 pounds. In dealing with
fertilizers it is the practice to call 20 pounds, or one per cent of a
ton, a unit, and to base the price of the nitrogen, and phosphoric
acid, and potash, on the unit. This is done for convenience. If five
cents is a fair price for a pound of available phosphoric acid in one's
locality, as it would be if a ton of 14 per cent acid phosphate cost
$14, a unit of 20 pounds is worth $1. Each one per cent guaranteed is
thus worth a dollar, and the phosphoric acid in the fertilizer is
easily valued. If a pound of potash in a ton of muriate is worth five
cents in one's locality, as it would be if a ton of muriate cost $50,
the muriate being one half actual potash, a unit of 20 pounds of potash
is worth $1. Each one per cent of guaranteed potash is thus worth one
dollar, and the entire content of potash is easily valued. If a pound
of nitrogen in nitrate of soda is worth seventeen and one half cents a
pound in one's locality, as it would be if a ton of nitrate of soda
cost $54, a unit, or one per cent, is worth $3.50, and the content of
nitrogen is easily valued.

The prices named would seem high to good cash buyers near the seaboard,
and they are too low for some other regions where freights are very
high. They are only illustrative. The consumer can get his own basis
for an estimate by obtaining the best possible cash quotations from
city dealers. Some interested critic may point out that nitrate of soda
should not be the sole source of nitrogen in a fertilizer on account of
its immediate availability. Manufacturers use some sulphate of ammonia,
and a pound of nitrogen in it has had practically the same market price
as that in nitrate of soda. Tankage may be used in part, and in it the
nitrogen costs very little more per pound.

It may be said that the potash in the fertilizer is in form of
sulphate. Usually that profits the user nothing, and often the claim is
baseless, but if it is a sulphate, the cost of the potash should have
only 20 per cent added to the valuation of the potash, which usually
will not add one dollar to the total cost of the ton of mixed
fertilizer. Basing the valuations of the pounds of plant-food in the
mixed fertilizer on the value per pound in unmixed materials delivered
to one's own locality, there must be taken into account the added
expense of mixing.

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