e spring. We
have had several direct instances of this kind in our experience, and we
would give it as a suggestion, in most cases applicable, that manures
for wheat, and especially ammoniacal ones, should be applied before or
at the time the seed is sown; for, although the apparent luxuriance of
the crop is greater, and the produce of straw really heavier, by spring
rather than autumn sowings of Peruvian guano and other ammoniacal
manures, yet we believe that that of the _corn_ will not be increased in
an equivalent degree. Indeed, the success of the crop undoubtedly
depends very materially on the progress of the underground growth during
the winter months; and this again, other things being equal, upon the
quantity of available nitrogenous constituents within the soil, without
a liberal provision of which, the range of the fibrous feeders of the
plant will not be such, as to take up the minerals which the soil is
competent to supply, and in such quantity as will be required during the
after progress of the plant for its healthy and favorable growth."

These remarks are very suggestive and deserve special attention.

"The next result to be noticed," continue Messrs. Lawes and Gilbert, "is
that obtained on plot 6, now also divided into two equal portions
designated respectively 6_a_ and 6_b_. Plot No. 6 had for the crop of
1844, superphosphate of lime and the phosphate of magnesia manure, and
for that of 1845, superphosphate of lime, rape-cake, and ammoniacal
salts. For this, the third season, it was devoted to the trial of the
wheat-manure manufactured under the sanction of Professor Liebig, and
patented in this country.

"Upon plots 6_a_, four cwts. per acre of the patent wheat-manure were
used, which gave 20-1/4 bushels, or rather more than two bushels beyond
the produce of the unmanured plot; but as the manure contained, besides
the minerals peculiar to it, some nitrogenous compounds, giving off a
very perceptible odor of ammonia, some, at least, of the increase would
be due to that substance. On plot 6_b_, however, the further addition of
one cwt. each of sulphate and muriate of ammonia to this so-called
'Mineral Manure,' gives a produce of 29-1/4 bushels. In other words, the
addition of ammoniacal salt, to Liebig's mineral manure has increased
the produce by very nearly 9 bushels per acre beyond that of the mineral
manure alone, whilst the increase obtained over the unmanured plot, by
14 tons of farm-yard manure