Experiment Station Record, Volume 92, January-June, 1945 Page: 45
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19451 FIELD CROPS 45
materially affect the level of lint percentage, lint index, staple length, or seed index.
The magnitude of each of these characteristics depended on variety. Fuzzless or
naked seed individuals of the Seabrook variety produced lint percentage and lint
index values definitely lower than those of its normal seed fuzz forms; staple length
and seed index were not affected much by condition of seed fuzz. Gaddis cotton
had a much larger proportion of naked seeds and shorter staple, lower lint percentage,
lint index, and seed index than Seabrook, but no significant differences were
apparent in the levels of these four characteristics to the different fuzz grades.
Results of Gaddis progeny rows in 1943 verified this relationship. Naked seed in
sea island appeared to be a recessive character.
Improved rooting of Cryptostegia cuttings callused on the plant, H. F.
LOOMIS and J. H;. HEUER. (U. S. D. A.). (Torreya, 44 (1944), No. 1, pp. 8-11,
illus. 2),-Girdling to cause large calluses, with great food storage capacity, appeared
to increase rooting expectancy of cuttings and speed of rooting and size of
roots. These conditions were improved further by use of a plant-growth substance
on the callus when the cutting was made. Summer rooting of "old girdled" cuttings
may be as good as rooting in cooler weather when a temperature differential may
be maintained with bottom heat.
Flax facts, E. J. MITCHELL, A. C. DELLMAN, ET AL. (Minneapolis: Japs-Olson
Press, 1944, 2. ed., rev., pp. , illus. 16).-A compilation of information on
production of flaxseed, recommended varieties, flax weeds, and diseases, uses of
linseed oil, oil meal, and flax straw, and commercial movement of the crop, assembled
in loose-leaf form as contributions from experiment station, State, Federal, and
industrial specialists on the crop. See also an earlier note (E. S. R., 63, p. 440).
The propagation of guayule from cuttings, M. S. NISIIIMURA, R. EMERSON,
T. HATA, and A. KAGEYAMA. (Amer. Jour. Bot., 31 (1944), No. 7, pp. 412-418,
illus. 6).-Guayule could be propagated freely from cuttings at any time of year.
Best results have been obtained in early spring, after growth has started, but before
the long internodes of later-season growth have developed. Cuttings from laterseason
growth also root easily if cut short enough, but are more prone to damping
off. Use of root-inducing hormones did not in general improve the rooting of
guayule cuttings appreciably, but was effective on late-season cuttings cut too long
to root easily without treatment. Rooted cuttings could be transplanted easily to
the field, started growth more rapidly than transplanted seedlings, bloomed earlier,
and produced as much rubber during the first year as plants of comparable age
Hemp production experiments: Cultural practices and soil requirements,
C. P. WILSIE, C. A. BLACK, and A. R. AANDAHL. (Coop. U. S. D. A.). (Iowa
Sta. Bul. P63 (1944), pp. 46, illus. 20).-Experiments with hemp, 1942-43, were concerned
with seeding practices, fertilizers, soil types, yields after other crops (E. S. R.,
91, p. 151), and other production practices. Results in several localities led to the
recommendation of planting 5 pk. of seed per acre in preference to 3 pk. because
of the greater likelihood that stalks more nearly ideal in size, yielding a higher
percentage of fiber and a greater total yield of fiber, will be produced. Drilling seed
was found preferable to broadcasting, producing better stands and higher yields.
Planting in late April or early May, before corn planting, appeared desirable. Indications
were that if hemp is mature enough to be harvested during August 25-31 and
September 1-10, field retting may be expected to be more successful than when
harvesting is delayed until September 1.5 or later.
In fertilizer trials on six soil types in the hemp-growing area, where N (25 lb.
per acre), P (50 lb. P205), and K (25 lb. K20) were applied singly arid in combinations,
average increases in acre yield of dry, retted straw from fertilization ranged
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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. (digital.library.unt.edu/ark:/67531/metadc5064/m1/58/: accessed February 27, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.