Experiment Station Record, Volume 92, January-June, 1945 Page: 24
The following text was automatically extracted from the image on this page using optical character recognition software:
24 EXPERIMENT STATION RECORD [Vol. 92
carried on at low temperatures without appreciable loss of boron and did not interfere
with the satisfactory recovery of small amounts of added boron. The heating
of soil suspensions brought into solution more boron than that found in unheated
suspensions kept for a similar period. The long standing of suspensions which
had been heated and cooled did not lower the soluble boron to the level of that of
unheated suspensions. The oven drying of air-dried soils or of rewetted air-dried
soils that were again air-dried caused little change in the water-soluble boron content
in some soils and considerable change in others. The degree of cooling of heated
soil suspensions before filtration materially affected the water-soluble boron values
obtained in some instances. As dilution in the soil suspensions increased, the watersoluble
boron (air-dry soil basis) increased.
The application of sulfur to orchard soil resulted in increased water-soluble boron
even after a lapse of 10 yr. An Aiken soil from olive and citrus areas near Oroville
showed no increased boron solubility when acid was used instead of distilled water
in making the soil suspensions, and yet the olive trees alone have thus far responded
to the application of boron to the soil. Other citrus soils near Oroville were found
to contain large amounts of water-soluble boron. Some of the citrus soils of California
showed a decreasing water-soluble boron content with increasing depths, but
in relatively few was there an increase with increasing depths. In most there was
no definite trend. Citrus soils in California were found to be generally well supplied
with water-soluble boron, and in certain areas the concentrations were excessive.
The fixation of added boron by Dunkirk fine sandy loam, R. Q. PARKS.
(U. S. D. A.). (Soil Sci., 57 (1944), No. 6, pp. 405-416, illus. 6).-The Dunkirk
soil used was collected from the surface 6 in. of an experimental field near Ithaca,
N. Y. After being dried and mixed, a portion of the soil was used without further
treatment and the remainder extracted repeatedly with 0.05 N HC1 (10 1. of 0.05 N
HC1 having been added to 25 lb. of soil), and then repeatedly with distilled water.
In soft-glass tumblers, 125-gm. samples of 'the normal and of the acid-washed soil
were treated with solutions containing the equivalent of 0, 1, 5, 25, 75, and 200 lb.
of borax per acre. The samples were then dried at varying temperatures. After
drying, the samples were saturated with 40 cc. of distilled water and dried again. In
certain series as many as 24 such drying cycles were carried out. Each sample was
removed after every third drying cycle, rolled, mixed, and replaced in the tumbler.
Extractable boron was determined on duplicate samples of soil from each tumbler.
Fixation of added boron varied from none to almost complete fixation with increase
in number of drying cycles. Increase in temperature of drying from 26 to 85 C.
almost doubled the amount of boron fixation. Lime added with boron or before boron
additions strikingly decreased the fixation capacity of the soils for boron. At the
lower levels of boron supply, percentage fixation increased as boron concentrations
The results are discussed in the light of the work of other investigators. It is
concluded that the data obtained tend to support the mechanism of boron fixation by
entrance into the clay crystal lattice more than fixation by chemical precipitation,
absorption by clay or organic matter, or microbiological fixation.
Soil fertilizers: Their application and function on soils in Alaska, D. L. IRWIN
(Alaska Sta. Cir. 5 (1944), pp. 11).-A discussion of the function, need, and recommended
usage of fertilizers for various crops.
Barnyard manure: Its value and use in Alaska, D. L. IRWIN (Alaska Sta. Cir.
2 (1944), pp. 5).-A general information circular on the conservation and value of
Inspection and analysis of commercial fertilizers, H. J. WEBM (South Carolina
Sta. Bul. 348 (1943), pp. 138+-).-The 1942-43 inspection data are presented, with
the customary analyses.
Here’s what’s next.
This book can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Book.
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/m1/37/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.