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CROP-ROTATIONS

A Three Years' Rotation
An Old Succession Of Crops
Corn Two Years
Durability Of Manure
Grain And Clover
Potatoes After Corn
Selection Of Crops
The Clover And Timothy
The Farm Scheme
The Oat Crop
Two Crops Of Wheat
Two Legumes In The Rotation
Value Of Rotation

More from CROP-ROTATIONS

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
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



Durability Of Manure








Tests of the durability of manure in the soil
involve some uncertain factors, but we are interested only in the
effects of applications. These effects may continue for a long term of
years, and an example will illustrate. Land may be too infertile to
make a good clover sod. If a good dressing of manure be given half the
land, affording proper conditions for making a sod, the result will be
a heavy growth of clover, while the seeding on the unmanured half will
be nearly a failure. If no manure or fertilizer be used in the
crop-rotation, the probability is the manured portion of the field will
again make a fairly good sod. How much this success may be due to the
remains of the manure, and how much is attributable to the effect of
the clover and to better bacterial life introduced and favored by the
manure, no one knows. Probably the greater part of the benefit comes
only indirectly from the manure applied three or four years previously.
Half of the field may thus be lifted out of a helpless state and remain
out of it for a long term of years, while the other half grows only
poorer. A probable illustration of this lasting indirect effect may be
seen in one of the plats in the soil fertility experiments on the
Pennsylvania experiment station farm.

Experiments at the Rothamstead station, England, show some lasting
results from applications of manure. Director Hall cites the case of
one plat of grass land which was highly manured each year from 1856 to
1863, and has since been left unmanured. In 1864 this plat gave double
the yield of an adjoining plat which had been left unmanured during the
eight years. In 1865 the plat, last manured in 1863, gave over double
the yield of the unmanured. In the following ten years its yield was a
half more than that of the unmanured. In the next ten years the yield
was a quarter more. In the next ten years it fell to 6 per cent more
than the plat that had received no manure in the beginning of the
experiment. In the following ten years it rose to 15 per cent. Here is
a lasting effect of manure for over forty years where grass was grown
continuously.





Next: The Farm Scheme

Previous: Reenforcement With Minerals



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