Experiment Station Record, Volume 95, July-December, 1946 Page: 25
xii, 1033 p. ; 24 cm.View a full description of this book.
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1946] SOILS-FERTILIZERS 25
schematic illustration for taking samples that can be worked out for fields of various
sizes and shapes; depth of sampling; technic of sampling; and shipping of sample.
Soil sampling tube, J. B. HESTER and K. HANKINSON (Jour. Amer. Soc. Agron.,
37 (1945), No. 12, pp. 1041-1042, illus. 1).-The authors briefly describe and illustrate
in a dimensioned drawing a sampling tube of which the principal feature consists
in the insertion of a choke ring, sharpened to constitute the cutting edge of the instrument,
such that the core of soil is cut slightly smaller than the bore of the main part
of the tube. The upper end of the tube is of unobstructed internal diameter, and
the core is slid out by inverting the tube. The sampler is described as being constructed
from stainless steel or hard brass. It is shown in the drawing as 3 ft. in
over-all length, the tubing being of 1 in. internal diameter with wall X in. thick.
The inserted choke and cutting edge is indicated to be of 1 in. outside diameter, '/
in. wall thickness, and 38 in. deep. The cutting edge is sharpened to an angle of
about 10.
This tube was found "not entirely satisfactory for stony or extremely dry soils,"
but satisfactory for moist clay or for sandy soils, simple of construction, and easy
to twist into the soil by hand.
Soil survey of Lincoln County, Tennessee, F. RUDOLPH ET AL. (Coop. Tenn.
Expt. Sta. et al.). (U. S. Dept. Agr., Bur. Plant Indus., Soils, and Agr. Engin.
[Soil Survey Rpt.], Ser. 1937, No. 16, pp. 135+, about 8 illus.).
The occurrence of Clostridium botulinum and Clostridium tetani in certain
plots of soil, E. W. COOK, JR. (Ohio State Univ., Abs. Doctoral Diss., No. 47
(1945), pp. 9-14).-The occurrence of C. botulinum and C. tetani was investigated
in 131 samples of soils obtained from field plots receiving different treatments. The
study revealed that the population of C. botulinum in the soil of the plots used
remained approximately the same over a long period of time and with a variety of
treatments. On the other hand, the population of C. tetani in the soil of these plots
varied. The best treatment for the occurrence of C. botulinum in the plots was
manure only, but any combination of manure and chemicals, such as phosphate and
lime, used as fertilizer was also good. C. tetani was more often found in the soil
of plots which had been treated with a combination of manure and chemicals, such
as lime and phosphate, though the chemicals alone were also good.
Both C. botulinum and C. tetani were more often found in those plots that were
sown to wheat than in any other crop studied. Most of the plots yielded strains of
C. botdlinum and C. tetani which were highly toxic. The toxicity of samples from
which these strains came followed those treatments of the plots which best maintained
C. botulinum and C. tetani in them.
Lipid production by a soil yeast, R. L. STARKEY. (N. J. Expt. Stas.). (Jour.
Bact., 51 (1946), No. 1, pp. 33-50, illus. 14).-The yeast was recovered from several
soils and thus is thought to be a common soil inhabitant. The yeast cultures considered
in this article were obtained from colonies which developed on a nitrogenfree
agar medium. The yeast is of interest because of its high lipide content
and because of unusual spore formation. The sequence of changes observed in
cultures is illustrated. The metabolism of the yeast was investigated.
The characteristics of the yeast are different from those of previously described
yeasts which have been studied for lipide synthesis. It was not possible to identify
the yeast with known species. The yeast may be a new species or a yeast already
described but with certain characteristics which have not been recognized up to
this time. Growth and lipide production were good in aerated glucose solutions
containing small amounts of yeast extract as the nitrogen source. Under favorable
conditions, 20 to 25 percent of the consumed glucose was converted to yeast cells
which contained 50 to 63 percent lipide. From 10 to 14 percent of the consumed
glucose was recovered as lipide. The lipide content of the cells decreased as the
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 95, July-December, 1946, book, 1948; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5061/m1/37/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.