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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



Soil Analysis








There is wide misconception regarding the value of
chemical analysis of the soil as an aid in making choice of a
fertilizer. Analysis has shown that some soil types are relatively
richer in plant-constituents than are others, and it has shown abnormal
deficiency in some types of limited area. It has given us more
knowledge of soils, but as a guide to fertilization in particular
instances it usually has no value. The samples used by an analyst are
so small that the inaccuracy in his determination may easily be greater
than the total amount of plant-food in a very heavy application of
commercial fertilizer. A field that has been reduced to temporarily low
productive power by heavy cropping or bad farming methods may show a
greater content of plant-food than another field that is in a highly
productive condition. This is a fact difficult of acceptance by some
who want the aid of science, but such are the present limitations. The
weight of a fertilizer application is so small in comparison with the
weight of the surface part of an acre of land that the use of a ton of
fertilizer may not be detected in the analyst's determinations, and
moreover his determinations of actual availability in the soil's
supplies are not serviceable in the selection of a fertilizer for any
particular field and crop.





Next: Physical Analysis

Previous: Prejudice Against Commercial Fertilizers



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