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THE NEED OF COMMERCIAL FERTILIZERS

Fertilizer Tests
Loss Of Plant-food
Phosphoric-acid Requirements
Physical Analysis
Potatoes And Crimson Clover
Prejudice Against Commercial Fertilizers
Soil Analysis
The Need Of Potash
The Use Of Nitrogen

More from THE NEED OF COMMERCIAL FERTILIZERS

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



Phosphoric-acid Requirements








Soil analyses show that the content of
phosphoric acid in most soils of this country is relatively small. The
results of experiments with the various constituents of fertilizers are
in accord with this fact. Fertilizer experiments at the various
stations and on farms are nearly a unit in showing that if any need in
plant-food exists, phosphoric acid is deficient. When crop-producing
power decreases, and the farmer begins to seek a commercial fertilizer
to repair the loss, he finds that bone-dust or acid phosphate is
serviceable. The resulting increase in yield often leads to such sole
dependence upon this fertilizer that clover and manure are disregarded,
the percentage of humus is allowed to drop, and finally the fertilizer
is brought into disrepute. The need of phosphoric acid is so common
that it is the sole plant-food in much fertilizer, and the dominant
element in practically all the remainder on the market.





Next: The Need Of Potash

Previous: The Use Of Nitrogen



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