This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1922 Excerpt: ...in organic matter in the soil, whether a residue
has been added or not. However, there is a different kind of
decomposition depending upon the nitrogen content of the residue.
The decomposition of a residue low in nitrogen, like straw, does
not seem to proceed any faster than is permitted by the soil's
ability to supply the nitrate-nitrogen necessary for decomposition,
or, in other words, for the necessary biological activity, while
alfalfa, which, with a high nitrogen content, furnishes its own
nitrogen supply, is apparently limited as to extent of
decomposition by variations in biological flora only. Carbon
Dioxide Evolution from Soils of Varylng Nitrogen Content Treated
with Straw and Alfalfa 146 days Some of the important deductions
from the work thus far indicate: 1. Organic matter maintenance
depends on the nitrogen content of the residue. 2. It becomes more
difficult to maintain organic matter and nitrogen as the soil
becomes more depleted of these materials. 3. The biological
activity of the soils of eastern Washington decreases directly with
the loss of organic matter and nitrogen. Virgin soils show greatest
activity. Soil Fertility Problems in Western Washington--Results
from fertility and management investigations on these soils are
consistent and supplementary to those previously reported. Muck and
peat soils are all acid in reaction and deficient in both
phosphorus and potassium to the extent that good results are
obtained from fertilizers containing these elements. Some of these
soils seem to 'be more deficient in phosphorus, while others will
respond most to a potassium application. The application of lime is
not justified on the basis of increased yields. Legume crops are
not adapted sufficiently well to recommend them for introduction in
|Country of origin:
Washington Agricultural Station
||246 x 189 x 13mm (L x W x T)
||Paperback - Trade
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