Experiment Station Record, Volume 57, July-December, 1927 Page: 24
xvii, 1002 p. ; ill. ; 24 cm.View a full description of this book.
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24 EXPERIMENT STATION RECO D [Vol. 57
In buckwheat, tops of extremely low weight appeared to be derived primarily
from seeds of low weight and high top weights as a rule from seeds of medium
or high weight. The data emphasize the advantage of selecting seeds by
weighing as opposed to the random method in obtaining seeds of a certain
grade.
Although the method of selection of seeds has been efficient in checking
variability of the tops, no such advantage was obtained for the roots. It
seems clear that there is a decided advantage in having seeds of uniform
weight. It is held that the variability of soy beans in solution cultures may
be minimized by careful seed selection.
Preliminary report on the relations between pigment formation, leaf
area, and dry weight of corn grown in sand cultures, H. B. SPRAGUE (New
Jersey Stas. Rpt. 1925, pp. 332-337).-This experiment was started for the study
of relations between the formation of the pigments, chlorophyll A and B,
carotin, and xanthophyll, and the development of leaf area and dry weight
in strains of corn during growth. The results are detailed and tabulated for
the period. Chlorophyll content was found to be more closely related to leaf
area than to weight of leaf. On the other hand, carotin formation was more
closely connected with dry weight of leaf than with leaf area. Xanthophyll
content was found to correspond to the values for carotin. Further experiments
are planned to test the validity of these and other observations.
Changes in nitrogen, potassium, and phosphorus content of wheat seedlings
during germination and early stages, J. DAVIDSON (Bot. Gaz., 81 (1926),
No. 1, pp. 87-94).-Wheat seedlings between the age limits in which they are
generally used for experimental purposes differed in composition from the
stock seed from which they were obtained. They either lost or gained potassium
and nitrogen, depending upon their age and the conditions under which
they were grown, but changed little in phosphorus content. The results indicate
that the gains in nitrogen and potassium were due chiefly to the absorption
of materials leached from the ungerminated seeds.
The ungerminated seeds consistently lost more potassium, nitrogen, and
phosphorus than did the seedlings. The results, however, do not decide the
question as to whether sterile seeds may be naturally deficient in these elements.
It is recommended that in plant nutrition studies the seedlings with which
the experiments are started, rather than the stock seed from which they were
grown, be used as a standard of comparison.
Toxicity and antagonism in salt solutions as indicated by growth of
wheat roots, S. F. and H. M. TRELEASE (Bul. Torrey Bot. Club, 53 (1926), No. 3,
pp. 137-156, figs. 5).-In work set forth in a previous paper (E. S. R., 56, p.
425), it was found that reliable solution-cultural results may be secured if
attention is confined to the first few days of seed germination, and that by
means of such tests physiological balance may be demonstrated in a quantitative
manner. It is the purpose of the present paper to present results which
indicate that the same method may also be used in studying toxicity of singlesalt
solutions as well as antagonistic effects in mixed solutions. The work
was undertaken with the aim of determining whether root elongation of very
young seedlings might be used for studies of antagonistic effects.
A study was made of the rate of elongation of wheat roots immersed in
solutions containing pairs of the salts potassium nitrate, calcium nitrate, and
magnesium nitrate, and in simple solutions of each of these salts. The results
of this study indicate that very young wheat seedlings can be satisfactorily
used for demonstrating the growth-retarding effects of single-salt solutions and
the antagonistic action of mixed solutions. It is shown that, for the salts and
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General Index to Experiment Station Record, Volumes 51 to 60, 1924-1929 (Book)
A topical, alphabetically arranged index to volumes 51-60 including experiment station records, publications reviewed, and foreign publications. In has a list of all editorial notes from the referenced volumes.
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United States. Office of Experiment Stations. Experiment Station Record, Volume 57, July-December, 1927, book, 1928; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5099/m1/41/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.