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A Few Combinations Are Safest
All The Nitrogen From Clover
Amount Of Application
Buying Unmixed Materials
Composition Of Plant Not A Guide
Fertilizer For Grass
Maintaining Fertility
Method Of Applying Fertilizers
Similarity Of Requirements
The Multiplication Of Formulas


Crops And Methods For Soil Improvement

A Bit Of Arithmetic
A Clean Seed-bed
A Practical Test
A Southern Legume
A Three Years' Rotation
Acid Phosphate
Acquaintance With Terms
Adaptation To Eastern Needs
Affecting Physical Condition
Alsike Clover
Amount Of Manure
Amount Per Acre
An Excess Of Nitrogen
An Old Succession Of Crops

Similarity Of Requirements

Many of our staple crops are very similar
in their fertilizer requirements, and this simplifies fertilization.
Setting aside the impression gained from the dissimilarity in the
so-called corn, potato, wheat, and grass fertilizers on the market, the
farmer knows that the soil which is in a good state of fertility is
best for any of them, and if the soil is hard-run, it should have its
plant-food supply supplemented. The hard-run soil usually is lacking in
available supplies of all three plant-food constituents. If a
fertilizer containing 3 per cent of nitrogen, 10 per cent of phosphoric
acid, and 6 per cent of potash serves the wheat well, it will serve the
timothy that starts in the wheat. Likewise it will serve the corn,
although a heavier application will be needed because corn is a heavy
feeder. Experience has taught that it will serve the potato similarly,
and that the potato will repay the cost of free use of fertilizer. If
the soil is sandy and deficient in potash, the percentage of phosphoric
acid may be cut to 8, and the percentage of potash raised to 10, and
all these crops will profit thereby. If the nitrogen content in the
soil is high, none of these crops may need nitrogen in the fertilizer.
This is a general principle, and safe for guidance, though the best
profit will demand some modification that readily occurs to the farmer
as he studies his crops and their rotation. To illustrate: The corn is
given the clover sod or the manure partly because it requires more
plant-food than the wheat. It gets the best of the nitrogen, and may
need only a rock-and-potash fertilizer, while the wheat that follows
may need some available nitrogen to force growth in the fall. There is
no fixed formula for any field or crop, and the point to be made here
only is that the requirements of many standard crops do not have the
dissimilarity usually supposed, except in respect to quantity. A marked
exception is found in the oat crop, which does not bear the application
of much nitrogen, and often fares well on the remains of the manure
that fed the corn, if some phosphoric acid is added.

Next: Maintaining Fertility

Previous: Amount Of Application

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