Experiment Station Record, Volume 89, July-December, 1943 Page: 65
xiv, 885 p. ; 24 cm.View a full description of this book.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
1943] FIELD CROPS 65
maturing vetches and are past flowering and have ripened at least most of their
seed before high temperatures and humidity prevail. They also escape the
severe late-spring insect (especially pea aphid and corn earworm) devastations
so destructive to seed crops of late-maturing vetches in Alabama. Promising
strains selected from monantha vetch (Vicia monantha) are heavy seed producers,
capable of vigorous early-spring growth which permits early turning for green
manure. The LaFayette and Monala monantha varieties are hardy enough for
all sections of the State. A few early-maturing strains of woollypod vetch (V.
dasycarpa) are also superior seed producers but shatter as pods ripen.
The importance of various roots to the wheat plant, B. J. SALLANS (Sci.
Agr., 23 (1942), No. 1, pp. 17-26, illus. 1).-The relative importance to the wheat
plant of the seminal and crown root systems and individual roots 'was determined
by root amputations and their effects upon plant yields. After becoming
well established roots contributed independently of each other to the final yield
of grain. The primary seminal root proved the most valuable individual root and
equal in importance to both roots of the first pair of lateral seminal roots. The
second pair of seminal roots, the sixth seminal, and coleoptile axillary roots
proved much less valuable than the first three seminal roots, being about as
valuable root for root as the crown roots. Contributions of the crown roots, individually
small, were in the aggregate usually larger than those of the seminal
roots. Much variation in crown root contributions to yield may occur with
variation in seasonal precipitation and soil moisture. The relation of the roots
to the plant's water supply and the influence of root amputation upon water
supply is discussed, and also the parallel between artificial amputation of roots
and that due to root infection by root-rotting soil micro-organisms.
Wheat grains without embryos, 0. A. STEVENS. (N. Dak. Expt. Sta.).
(Science, 97 (1943), No. 2508, p. 91).-The proportion of embryoless seeds in
Ceres of the 1941 crop was similar to that found by Lyon (E. S. R., 59, p. 518).
The distribution of thiamin in the wheat plant at successive stages of
kernel development, W. F. GEDDES and M. N. LEVINE. (Minn. Expt. Sta. coop.
U. S. D. A.). (Cereal Chem., 19 (1942), No. 5, pp. 547-552, illus. 1).-The thiamin
concentration in kernels of early- and late-sown Thatcher and late-sown Ceres
wheat decreased slightly during the first few weeks after blossoming and then
remained relatively constant, with an apparent slight increase at full maturity.
It decreased markedly in glume and stem fractions as the kernels filled. In the
mature plant values for glume fractions were only from 18 to 25 percent and
those for stem fractions from 38 to 57 percent of those at 7 days after blossoming.
The concentration in tillers as a whole changed little with maturity. Total
thiamin in kernels increased, while that in glume and stem- fractions decreased
greatly throughout the ripening period. The bulk of the thiamin in the mature
plant was present 1 week after blossoming and was translocated from glumes,
rachis, stems, and leaves into developing kernels. Thus in early-sown Thatcher
about 25 percent of the total thiamin of the tiller was in the kernels, 15 in the
glue, and 60 percent in the stem fraction at 7 days after blossoming. In the
mature tiller the kernels contained about 77, glume 2, and stem fraction 21
percent.
Natural selection in varietal mixtures of winter wheat, H. H. LAUDE and
A. F. SWANSON. (Kans. Expt. Sta. and U. S. D. A.). (Jour. Amer. Soc. Agron.,
34 (1942), No. 3, pp. 270-274, illus. 1).-The rate of cumulative changes from
year to year, 1932-40, in a winter wheat varietal population when Kanred was
mixed with Harvest Queen and with Currell was so rapid in each case as to shift
the varietal ratios from equal proportions to nearly pure stands of Kanred in less
than 9 yr. Such changes might be attributed to competition among plants result525090-3---
5
Upcoming Pages
Here’s what’s next.
Search Inside
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 89, July-December, 1943, book, 1944; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5067/m1/79/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.