.9 | 5.7 | 13.2 | 24.2
Rape | 163.9 | 12.9 | 34.7 | 20.9 | 30.8 | 31.9
Oats | 85.5 | 11.2 | 24.8 | 18. | 8.8 | 29.
Lupine | 80.5 | 11.2 | 16.5 | 3.5 | 7. | 13.8
Wheat | 76.7 | 10.1 | 28.4 | 11. | 7.4 | 11.8
Peas | 71.7 | 11. | 11.2 | 7. | 9.4 | 14.3
Serradella | 79.8 | 13.4 | 8.8 | 4.8 | 9. | 18.4
Buckwheat | 80. | 7.2 | 8.8 | 4.2 | 6.6 | 11.
Barley | 42.2 | 5.5 | 9.5 | 3.5 | 5.5 | 11.2
---------------+-------+---------+-------+-------+---------+----------

It may be presumed, that, while these figures are not _absolutely_, they
are _relatively_, correct. In other words, we may conclude, that
red-clover leaves more nitrogen, phosphoric acid, and potash, in the
roots and stubble per acre, than any other of the crops named.

The gross amount of dry substance in the roots, and the gross amount of
ash per acre, are considerably exaggerated, owing to the evidently large
quantity of dirt attached to the roots and stubble. For instance, the
gross amount of ash in Lucern is given as 1,201.6 lbs. per acre; while
the total amount of lime, magnesia, potash, soda, sulphuric and
phosphoric acids, is only 342.2 lbs. per acre, leaving 859.4 lbs. as
sand, clay, iron, etc. Of the 1,919.9 lbs. of ash in the acre of
clover-roots and stubble, there are 1,429.4 lbs. of sand, clay, etc. But
even after deducting this amount of impurities from a gross total of dry
matter per acre, we still have 7,492.2 lbs. of dry roots and stubble per
acre, or nearly 3-1/4 tons of _dry_ roots per acre. This is a very large
quantity. It is as much dry matter as is contained in 13 tons of
ordinary farm-yard, or stable-manure. And these 3-1/4 tons of dry
clover-roots contain 191-1/2 lbs. of nitrogen, which is as much as is
contained in 19 tons of ordinary stable-manure. The clover-roots also
contain 74-3/4 lbs. of phosphoric acid per acre, or as much as is
contained in from 500 to 600 lbs. of No. 1 rectified Peruvian guano.

"But the phosphoric acid," said the Doctor, "is not soluble in the
roots." True, but it was soluble when the roots gathered it up out of
the soil.

"These figures," said the Deacon, "have a very pleasant look. Those of
us who have nearly one-quarter of our land in clover every year, ought
to be making our farms very rich."

"It would seem,