Experiment Station Record, Volume 92, January-June, 1945 Page: 17
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19451 SOILS-FERTILIZERS 17
water supply available for drainage and the distribution of permeability and moisture
potential gradients through the wet zone at the time when the drainage rate has
become insignificantly small.
The results reported upon are held to suggest that shallow field irrigations or the
irrigation and drainage of short soil columns in the laboratory do not necessarily
provide valid measures of the field capacity of a soil.
The soils of equatorial regions, with special reference to the Netherlands East
Indies, E. C. J. MOHR, trans. by R. L. PENDLETON (Ann Arbor, Mich.: J. W. Ed-,
wards, 1944, pp. 766+, illus. 259).-A comprehensive coverage of these soils as
translated from the Nederlandsch.
Soil building and pasture practices for Alaska, D. L. IRWIN (Alaska Sta. Cir.
4 (1944), pp. 5).A-A circular of practical information on soil management for maintenance
of productivity. Special consideration is given to the management of pastures.
Removal of nutrients from the soil by crops and erosion, 0. R. NEAL.
(U. S. D. A. and N. J. Expt. Stas.). (Jour. Amzer. Soc. Agron., 36 (1944), No. 7,
pp. 601-607, illus. 2).-Analysis of material eroded from Collington sandy loam
consisted in determining available nitrates by the Morgan method (E. S. R., 77, p.
302), together with total nitrates present. These results are considered in relation
to like data for the original surface soil. The quantities of nitrogen, phosphoric
acid, and potash removed by tomatoes and sweet corn and the quantities removed
by erosion during the crop year are shown.
The average content of particles less than 50[, in diameter in the surface of the
original soil amounted to 15.8 percent. The eroded material contained 58 percent of
these size fractions. In comparison with the original surface soil the eroded material
contained 4.7 times as much organic matter, 5.0 times as much nitrogen, 3.1 times
as much P20s, and 1.4 tines as much K20. Chemical studies indicated that the percentage
availability of P205 in the eroded material was equal to that in the soil.
Potash in eroded material showed a percentage availability 3.7 times greater than
that in the soil. Erosion losses of nitrogen, in comparison with crop removal, were
comparatively small in all cases. Erosion losses of total' phosphoric acid, where
no cover crop or other conservation practice was used, were double the quantity
removed by tomatoes or sweet corn. Where cover crop or cover crop and manure
were used annually, the erosion loss continued to equal the quantity of PS20 removed
by either crop. The removal of total K20 by erosion, where no conservation practices
were employed, exceeded the removal of KsO by tomatoes and was nearly four
times as much as the removal by sweet corn. Where conservation practices as shown
were employed, the removal of total K20 by erosion was more than one-half as
much as that by tomatoes and continued somewhat to exceed the quantity removed
from the soil by sweet corn.
Effect of chaparral burning on soil erosion and on soil-moisture relations,
A. W. SAMPSON. (Univ. Calif.). (Ecology, 25 (1944), No. 2, pp. 171-191, illus. 9).
-Chaparral and its understory vegetation effectively protect the soil against abnormal
erosion, and this protection favors relatively high infiltration capacity of the
soil. The grazing of sheep on recently burned slopes may measurably increase
erosion. The data indicate that heavy burning of slopes in excess of 30 percent will
accelerate erosion in proportion to the degree of grazing and trampling.
Investigations in erosion control and reclamation of eroded land at the central
Piedmont conservation experiment station, Statesville, N. C., 1930-40, T. L.
COPLEY, L. A. FORREST, A. G. MCCALL, and F. G. BELL. (U. S. D. A. coop. N. C.
Expt. Sta.). (U. S. Dept. Agr., Tech. Bul. 873 (1944), pp. 66+, illus. 21.)-This is
one of a series of bulletins (E. S. R., 91, p. 256) covering the first 10 yr. of experimental
work at each of the 10 original soil erosion experiment stations.
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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/m1/30/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.