Experiment Station Record, Volume 39, July-December, 1918 Page: 35
xxix, 1002 p. ; 24 cm.View a full description of this book.
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1918.1 IELD CROPS. 35
of tobacco, while sodium and lithium carbonates did noti Potassium oxalate
was the only effective oxalate tested. Of the carbonates and oxalates tested
in an alkaline medium lithium was more effective than sodium in the precipitation
of colloids and was also slightly more effective in increasing the fire-holding
capacity. The citrates showed no such relationship, and of the carbonates potassium,
rubidium, and caesium did not behave in this manner. It is doubted,
therefore, whether the effect of the salts upon the colloidal state of the tobacco
leaf is significant.
Potassium citrate promoted burning, while the citrates of sodium and lithium
were nearly neutral in their effect.
The organic salts of potassium, potassium carbonate, tripotassium phosphate,
dipotassium phosphate, and potassium sulphate improved the fire-holding capacity,
while potassium chloqid, acid potassium sulphate, and monopotassium
phosphate were injurious to the burn.
Sodium carbonate improved the fire-holding capacity slightly, while all
other sodium salts were either neutral or injurious.
Data were obtained which failed to confirm the theory that reduction of the
potassium salts accounted for their favorable action. Other data showed that
the harmful effect of the chlorids was not due to their fusion as suggested by
Barth. It was also evident that the alternate giving off and taking up of carbon
dioxid did not account for the beneficial effect of potassium carbonate.
The author concludes that the effect of the salts in raising the temperature of
the leaf may be significant, and that the action of caesium, potassium, and rubidium
salts may be due to a number of complex factors. It is also deemed
probable that caesium, potassium, and rubidium as carbonates, sulphates, and
phosphates possess a specific catalytic action in combustion, and that the
chlorids possess a negative catalytic action.
It is proposed to study the rate of decomposition of various organic salts
of the alkalis and the decomposition products of various organic substances
treated with salts of the alkalis when subjected to temperatures which are attained
in the burning cigar.
A brief bibliography is appended.
Shall we plant more spring wheat? W. L. BURLISON (Illinois Sta. Circ. 214
(1918), pp. 2).-The possibility of increasing spring wheat production in Illinois,
especially in the northern and central part of the State, is indicated, and
cultural methods are briefly described. Marquis, with 3-year average yields
of 32.2 bu. per acre at DeKalb and 24.2 bu. at Urbana, is especially recommended;
while Durum, Red Fife, and Bluestem are also regarded as valuable
varieties.
Respiration of stored wheat, C. H. BAILEY and A. M. GUBJAR (Jour. Agr.
Research [U. S.], 12 (1918), No. 11, pp. 685-713, figs. 7).-Briefly defining respiration
"as the release of energy through the biochemical oxidation of organic
compounds as accelerated by certain enzyms," the authors describe rather extensive
investigations conducted at the Minnesota Experiment Station on the
respiration of stored wheat and on the consequent heating of the grain.
"Since the grain itself is a poor conductor of heat, it follows that the heat
energy released through respiration accumulates in the mass in proportion to
its bulk, so that the increase in temperature may in time become very marked."
All available evidence is held to indicate that the heat of respiration is produced
by the oxidation of reducing sugars, that the principal release of energy
should occur in the structure where it is required for the synthesis of new organic
compounds, and that the embryo being endowed particularly with that
function, respiration must be most pronounced in it, if not confined to it.
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General Index to Experiment Station Record, Volumes 26-40, 1912-1919 (Book)
A topical, alphabetically arranged index to volumes 26-40 including experiment station records, publications reviewed, and foreign publications. In has a 'Consolidated Table of Contents' which lists all editorial notes and publications of the experiment stations and Department of Agriculture from the referenced volumes.
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United States. Office of Experiment Stations. Experiment Station Record, Volume 39, July-December, 1918, book, 1919; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5015/m1/64/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.