All The Nitrogen From Clover
The Pennsylvania station has shown in a
test of thirty years that when good clover is grown in a four-years'
rotation of corn, oats, wheat, and clover, the fertility of the
naturally good clay loam soil may be maintained, and even slightly
increased, without the use of any manure or purchased nitrogen.
Phosphoric acid and potash have been applied, and the clover hay crop
has been taken off the land. This result has been possible only by
means of good clover sods. If there had been no applications of
phosphoric acid and potash, the clover would have failed to maintain
fertility, as is proved by other plats in this experiment. No one
should continue to depend upon such a scheme of keeping land fertile
whenever he finds that the clover is not thriving.
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