Experiment Station Record, Volume 67, July-December, 1932 Page: 15
xix, 895 p. ; 24 cm.View a full description of this book.
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1932] SOILS--FERTILIZERS 15
The piT and the phosphorus content of the expressed liquids from soils
and plant tissues, M. M. McCooL and W. J. YOUDEN (Contrib. Boyce Thompson
Inst., 3 (1931), No. 2, pp. 267-275, fig. 1).-Using a hand screw press and a
hydraulic press to provide pressures up to 30,000 lbs. to the square inch, the
authors expressed in part the liquid content of a brown, partially decomposed
sphagnum peat soil of German origin, of a dark brown, mainly sedge
peat, and of a black aquatic peat, the two samples last named having been
collected near Fishkill, N. Y. Certain herbaceous and woody stems were similarly
pressed.
Even 1,000 lbs. pressure yielded solutions of which the phosphate content
and H-ion concentration were markedly lower than those of the liquids obtained
at lower pressures from the same sources. Further reductions in concentration
accompanied further increases in pressure.
"There was appreciably less phosphorus in the liquids derived from the
[soil] samples by the application of 4,000 lbs. per square inch to them than
there was in the liquid obtained by means of the hand press. The solutions
obtained by means of the very high pressures in several instances contained
less phosphorus than one-half part per million. Upon rewetting pressed peat
specimens and hand pressing several hours later, the hydrogen ion concentration
and the phosphorus in the liquid thus obtained were nearly as great as
they were in the liquid obtained by the first hand pressing."
Soil-acidity studies with potatoes, cauliflower, and other vegetables on
Long Island, P. H. WESSELS (New York Cornell Sta. But. 536 (1932), pp. 42,
figs. 16).-Two series of plats at the Long Island Vegetable Research Farm,
130 altogether, were adjusted to various degrees of acidity by applications of
sulfur or sulfuric acid, or of lime, as each case required, and, with uniform
cultural care, were cropped to various vegetables, the results here reported
covering the work of four years. It is cautioned that "the suggestions given
here are intended for Long Island conditions and practices; they may or they
may not apply elsewhere."
The pH range for a maximum production of cauliflower was shown to be
that of from 5.5 to 6.6. Of the two varieties of this crop upon which report
is made, Berlin Forcing tolerated fairly well an acidity represented by pH 4.7,
whereas Dwarf Erfurt was seriously affected by "whiptail." The general
impression that potatoes will do well on acid soils was only partially confirmed.
"The fact that soils may be too acid for the best growth of potatoes has been
largely overlooked or not sufficiently stressed. . . . The figures presented show
that on this soil a reaction between pH 4.8 and 5.4 should be maintained if
potatoes are to be grown on the same soil year after year."
The determination of the pH values of the loess soils of North China
[trans. title], D. WVANG (China Geol. Survey, Soil Bul. 3 (1931), pp. [3C1S 7+
[42], pis. 3, fig. 1; Ger. abs., pp. 1-17).-The soils of North China were found
uniformly to be of a slightly alkaline reaction, the pIH values recorded all lying
within the range 8.05 to 8.65. Only the Manchurian soils were found to have
slightly lower pH values, a condition attributed to climatic influences.
With reference to the relation between soil pH, values and agricultural crop
plants it was observed- that pH values of from 8.05 to 8.3 appeared harmless,
that from pH 8.3 to pH 8.5 injury appeared not to be impossible, and that pH
values above 8.6 were definitely injurious.
Among means of improving productivity are mentioned (1) the drainage of
certain soils, whereby wheat yields could practically be doubled, and (2) the
use of ammonium sulfate to render soil reaction more suitable for certain
Pinus and Thuja species, for Robinia pseudaacaia, etc. A considerable group
of pot experiments are recorded.
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General Index to Experiment Station Record, Volumes 61 to 70, 1929-1934 (Book)
A topical, alphabetically arranged index to volumes 61-70 including experiment station records, publications reviewed, and foreign publications. In has a list of all editorial notes from the referenced volumes.
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United States. Office of Experiment Stations. Experiment Station Record, Volume 67, July-December, 1932, book, 1933; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5089/m1/34/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.