Experiment Station Record, Volume 92, January-June, 1945 Page: 23
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1945 SOILS-FERTILIZERS 23
when K, the supposedly limiting factor, was supplied in what was believed to be
adequate quantities. Lakewood sand, Whippany silty clay loam, Sassafras sand,
Gloucester loam, and Papakating stony loam had the greatest need of K, and
Dutchess shale loam, Bermudian silt loam, Dover loam, Penn silt loam, and Collington
loam, the least, the other 10 soils occupying intermediate positions.
Potassium response of various crops on a high-line soil in relation to their
contents of potassium, calcium, magnesium, and sodium, C. A. BOWER and
W. H. PIERRE. (Iowa Expt. Sta.). (Jour. Amer. Soc. Agron., 36 (1944), No. 7,
pp. 608-614).-The K response of seven different crops grown on a K-deficient highlime
soil of the Webster series was determined in the greenhouse, at two rates of K
fertilization. The crops were analyzed for K, Ca, Mg, and Na.
Large responses to K fertilization were obtained with corn and sorghum, whereas
only slight to moderate responses were obtained with flax, oats, and soybeans.
Sweetclover gave no response and that of buckwheat was negative. Of the various
crops studied, only flax and oats absorbed Na appreciably. It is believed that these
crops respond but little to K fertilization because the Na which they absorb substitutes
for K in the plant and thereby lowers the crop demand for K. With regard to
those crops which absorb little Na, it was found that their K responsiveness on the
high-lime soil studied varied with their normal contents of Ca and Mg in relation
to K. Sweetclover- and buckwheat, which gave no K response, are crops which
ordinarily use large quantities of Ca and Mg in relation to K, whereas the highly
responsive crops, corn and sorghum, normally use small quantities. Soybeans occupy
an intermediate position as regards K response and contents of Ca and Mg.
These results are explained on the hypotheses (1) that K absorption by crops on
high-lime soils is repressed by high concentrations of Ca and Mg in the soil solutions,
and (2) that those crops which require considerable amounts of Ca and Mg
for normal growth show low response to K fertilization because they lower the
ratios of Ca and, Mg to K in the soil- solution sufficiently to reduce or remove the
repressive effects of Ca and Mg on K absorption.
Prevention of calcium carbonate precipitation in soil solutions and waters by
sodium hexametaphosphate, R. F. REITEMEIER and M. FIREMAN. (U. S. D. A.).
(Soil Sci., 58 (1944), No. 1, pp. 35-41, illus. 1).--Alkaline soil solutions and waters
containing appreciable concentrations of calcium and bicarbonate ions were found
to be stabilized against the precipitation of calcium carbonate by the addition of
2 p. p. m. of sodium hexametaphosphate. The storage of such solutions for analysis
or for long-time soil experiments is thereby facilitated.
This concentration of the metaphosphate in percolation waters apparently has no
effect on the permeability and base status of a soil, as demonstrated by laboratory
permeability studies and exchangeable base determinations. Much higher concentrations
of metaphosphate cause ean increase in adsorbed sodium and a corresponding
decrease in permeability by virtue of the ability of the metaphosphate to form stable
soluble complexes with calcium.
The turmeric determination of water-soluble boron in soils of citrus orchards
in California, A. R. C. HAAS. (Calif. Citrus Expt. Sta.). (Soil Sci., 58 (1944),
No. 2, pp. 123-137, illus. 1).-If the original commercial alcohol was stored in the
Pyrex bottle for prolonged periods, the distilled product was unsatisfactory, and
the more so the longer the previous storage in Pyrex. The purity of the alcohol for
the tumeric suspension and the quality of the paper for its filtration (unless centrifuging
is used) require special attention. Satisfactory results were obtained
when the temperature of the bath used for obtaining the colored residue was electrically
controlled and the period for evaporation held constant. The importance of
including a blank with every set of unknowns is pointed out.
Clear filtrates of cool soil suspensions were readily obtained without rewarming
the suspensions. Ignition of the organic matter in filtered soil suspensions was
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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/m1/36/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.