Experiment Station Record, Volume 92, January-June, 1945 Page: 14
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14 EXPERIMENT STATION RECORD IVol. 92
and tabulated and explanatory data on the variability of rainfall. There are 40
Weather observations at the Rice Experiment Station, Crowley, La., for the
thirty-three-year period 1910 to 1942, inclusive, J. M. JENKINS. (Coop. U. S. D.
A.). (Louisiana Sta. Bul. 376 (1944), pp. 23).-The year following establishment
of this station weather instruments were installed for recording certain climatic
conditions under which field experiments with rice are conducted and for accumulating
weather data in the vicinity of Crowley, which is located in the principal ricegrowing
area of the United States. Summaries are presented in tables or text of
the temperature, rainfall, snow, frozen rain, ice, evaporation, and wind velocity for
the period covered.
Physical Land Surveys 32 and 34 (U. S. Dept. Agr. Soil Conserv. Serv., Phys.
Land Survey Nos. 32 (1944), pp. 61+, illus. 17; 34 (1944), pp. 55+, illus. 12).No.
32 deals with conditions in Muskingum and Guernsey Counties, Ohio, by C. L.
Whiteford, A. H. Paschall, and E. C. Sease; and No. 34 in Polk County, Ga., by
J. H. Winsor and C. L. Veatch.
Water-drop method of determining stability of soil structure, T. M. MCCALLA.
(U. S. D. A. coop. Nebr. Expt. Sta.). (Soil Sci., 58 (1944), No. 2, pp. 117-121).A
soil lump weighing approximately 0.15 gm. was placed on a 1-mm. screen, and
drops of distilled water 4.7 mm. in diameter, falling 30 cm. from a burette, were
allowed to fall upon it. When a soil lump or aggregate was broken down and at
the point of being washed through the screen, it was considered destroyed. The
end point was sharp for the loessial subsoil, but for the more highly aggregated
Marshall topsoil it was more difficult to determine, since the lump frequently broke
into several small aggregates that were kept together with a spatula until broken
down. Three sets of determinations with 20 individual determinations in each were
made. Air-dry soil was used. The number of water drops required to destroy a
lump of soil increased with reduction of soil or water temperature, but was less
for a wet soil than for a dry one. When the size of the drop was decreased more
drops were required to destroy the structure, but a smaller quantity of water was
required. The water-drop fall of 30 cm. and a soil lump size of 0.15 gm. were found
satisfactory for Peorian loess subsoil and Marshall silty clay loam topsoil, but more
variation in the number of drops required to destroy the soil structure was encountered
with Marshall topsoil than with loessial subsoil.
Determination of certain physical properties of forest soils.-I, Methods
utilizing samples collected in metal cylinders, H. J. LUTZ (Soil Sci., 57 (1944),
No. 6, pp. 475-487).-The first paper of this series is concerned with sampling cona(ltons
and with procedures for measurement of pore volume, air capacity, waterholding
capacity, and volume weight in samples of undisturbed soil collected in metal
With respect to sampling, it is pointed out that, whenever possible, the moisture
content of the soil should be at field capacity when sampling is carried out. This is
to eliminate expansion of fine-textured soils that are sampled in dry condition and
subsequently wetted and to obtain the more important advantage of the drainage of
gravitational water from the soil body under natural conditions, with the result that
the moisture content at field capacity is a more acceptable measure of water-holding
capacity than can be obtained in the laboratory. As an illustration of the discrepancies
which may be introduced by neglect of this precaution, the author cites the
example of a Merrimac sandy loam in which the water-holding capacity, determined
in the laboratory (samples in cylinders submerged in water for 24-48 hr., followed by
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 92, January-June, 1945, book, 1947; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5064/m1/27/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.