Experiment Station Record, Volume 92, January-June, 1945 Page: 57
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1945] FORESTRY 57
stage. For most questions involving nutrition, banana plants yield as much information
within about 3 mo. from planting as during their entire life. Various climatic
factors were found to play an important role in determining both rate of development
and number of fruit. Age of plant was also shown to affect the number of fruits.
Climatic effects must be assessed in measuring the effect of fertilizers. A fertilizer
may have an adverse effect on yield by causing the plant to develop its fruit in an
unfavorable part of the year. Time of planting may also influence yield. Potassium
accelerated development while nitrogen and phosphorous had no quantitative effects.
Citrus research in Southern Rhodesia, W. J. HALL. (Ann. Apple. Biol., 31
(1944), No. 2, pp. 164-166).-A general survey, including diseases and insect pests
and soil problems.
Effects of rootstock and environment on the composition of oranges and
grapefruit, W.. B. SINCLAIR and E. T. BARTHOLOMEW Hiligardia [California Sta.],
16 (1944), No. 3, pp. 125-176, illus. 18).-Over a period of 7 years, observations
were made on the composition of fruits of Valencia and Washington Navel oranges
and Marsh grapefruit grown on various rootstocks and under different environments.
Based on changes in soluble constituents, it was found that Valencia oranges grown
at Riverside (inland) matured slightly in advance of those grown at Tustin (coastal
district). Apparently the additional amount of sunshine and higher average temperatures
at Riverside favored increased photosynthetic activity and consequent accumulation
of carbohydrates. With all three varieties, the highest amount of chemical
substances in peel, pulp, and juice of the fruit was found, usually, in samples' from
trees on Morton and Savage citrange and trifoliate orange rootstocks. The lowest
contents were recorded in fruits from trees on rough-lemon stock. Total sugars
and acids, as percentages of the total soluble solids in the juice of fruit samples
from the different rootstocks, bore no relation to the mineral constituents. There
was a high correlation between total soluble solids and total sugars in both the
Valencia and Washington Navel oranges. The fraction of total soluble solids existing
as' total sugars was not influenced by the rootstock. The dry matter, as a
percentage of the fresh weight, was significantly higher in the peel, pulp, and juice
of Valencia fruits from Riverside than in those from Tustin. The total ash, on
a dry-weight basis, in peel, pulp, and juice was about the same in fruit from both
places. In grapefruit the mean dry matter and total ash were significantly higher
in the peel and pulp of Brawley-grown than in Riverside fruit. Information is
offered on the distribution of inorganic materials such as calcium and magnesium.
Forest land ownership in Louisiana and its influence on timber production,
A. D. FOLWEILER (Louisiana Sta. Bul. 377 (1944), pp. 56+, illus. 7).-Title to the
forest land of Louisiana is held largely by private owners with only about 12 percent
under control of public agencies. The task of increasing the fund of lumber in the
State rests, therefore, mainly with private owners. Louisiana forest lands can be
grouped into three important types: (1) Loblolly-shortleaf, (2) longleaf-slash, and
(3) Mississippi bottomland hardwoods. There are in the three types, respectively,
approximately 3,000, 1,000, and 3,000 ft. board measure of sawlogs per average acre.
In the nine parishes that were studied intensively there were almost 16,000 owners
who held title to slightly more than 3,000,000 acres of forest land. The average
areas held per owner in the above three types were respectively, 150, 213, and 630
acres. The task of increasing Louisiana timber is made difficult by the small holdings
and the heterogeneous nature of forests. Little use has been made of the
Reforestatiori Tax Act of 1924.
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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 D.C.. (digital.library.unt.edu/ark:/67531/metadc5064/m1/70/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.