| | Acid. | | |
| | | | |
+---------+----------+---------+---------+
| | | | |
Straw. | 11.20 | 2.67 | 13.76 | 6.20 |
Flour. | 22.17 | 2.76 | 1.62 | 0.39 |
Middlings. | 3.15 | 2.01 | 0.72 | 0.06 |
Shipstuff. | 1.68 | 1.32 | 0.63 | 0.09 |
Bran. | 6.84 | 7.53 | 2.49 | 0.36 |
+---------+----------+---------+---------+
Totals. | 45.04 | 16.29 | 19.22 | 7.10 |
____________|_________|__________|_________|_________|


From numerous investigations it has been found that in regard to the
nitrogen and the ash constituents, there is striking evidence of the
much greater influence of season than of manuring on the composition
of a ripened wheat plant, and especially of its final product--the
seed. Further, under equal circumstances the mineral composition of
the wheat grain, excepting in cases of very abnormal exhaustion, is
very little affected by different conditions as to manuring, provided
only that the grain is well and normally ripened. Again, it is found
that the composition may vary very greatly with variations of season,
that is, with variations in the conditions of seed formation and
maturation, upon which the organic composition of the grain depends.
In other words, differences in the mineral composition of the ripened
grain are associated with differences in its organic composition, and
hence the great value of proper selection both for seed and for
milling purposes.