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Controlling Factors
Direct Use For Corn
Effect Upon Moisture
Heavy Applications
Manure On Grass
Manure On Potatoes
Poultry Manure
Reenforcement With Minerals
When To Plow Down


Crops And Methods For Soil Improvement

A Bit Of Arithmetic
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

Reenforcement With Minerals

A ton of mixed manure in the stable
contains about ten pounds of nitrogen, five pounds of phosphoric acid,
and ten pounds of potash. This makes the percentage of nitrogen and
potash the same, while the percentage of phosphoric acid is only half
as high. A commercial fertilizer of such percentages would be esteemed
a badly balanced one. Certainly the phosphoric acid should be
relatively high, as this constituent of plant-food runs low in the
soil. If 50 pounds of 14 per cent acid phosphate were added to each ton
of manure while it is being made in the stable, seven pounds of
phosphoric acid would be added, making the percentage in the manure a
little higher than that of the nitrogen and the potash. A better
balance is given to the fertility. There cannot be any loss in this
purchased plant-food, if the stable floor is tight. Fermentation cannot
drive it off, and when applied to the soil it is tightly held.
Practically no phosphoric acid is found in drainage waters. Eight tons
of manure thus reenforced would contain the same amount of plant-food
as a ton of fertilizer having 4 per cent nitrogen, 5 per cent
phosphoric acid, and 4 per cent potash. The addition of the 50 pounds
of acid phosphate per ton does not bring the phosphoric acid content up
as high relatively as in most commercial fertilizers, but it helps. The
total amount in the eight tons manure may be sufficient, and the
greater part of the total has sufficiently immediate availability,
while the manure must undergo decomposition, and some of the nitrogen
and potash does not become available within the year.

Next: Durability Of Manure

Previous: Heavy Applications

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