58 STAT.] 78TH CONG. , 2 D SESS.-CH. 296-JUNE 28, 1944 physiological and related changes of such products during processes of marketing and while in commercial storage, $1,463,877. Irrigation agriculture: For investigations of crop production on irrigable lands, the quality of irrigation water and its use by crops, and methods for improving and maintaining the productivity of irri- gated soils, $145,000. National Arboretum: For the maintenance and development of the National Arboretum established under the provisions of the Act entitled "An Act authorizing the Secretary of Agriculture to estab- lish a National Arboretum, and for other purposes", approved March 4, 1927 (20 U. S. C . 191-194), employment of persons and means in the city of Washington and elsewhere, and travel expenses of employees and advisory council, $31,500, of which not to exceed $2,500 may be expended by contract or otherwise for the services of consulting landscape architects without reference to the Classi- fication Act of 1923, as amended, or civil-service rules. Plant exploration, introduction, and surveys: For investigations in seed and plant introduction, including the study, collection, pur- chase, testing, propagation, and distribution of rare and valuable seeds, bulbs, trees, shrubs, vines, cuttings, and plants from foreign countries and from our possessions, and also wild native plants, for experiments with reference to their introduction and cultivation in this country, for plant-disease investigations, including nematology, and for plant and plant-disease collections and surveys, $298,913. Plant Industry Experiment Farm: For the maintenance of a gen- eral experiment farm and agricultural station in the vicinity of Beltsville, Maryland, $56,976. Soil and fertilizer investigations: For soil and fertilizer investiga- tions, including soil minerals, soil organic matter, soil solution, soil physical and chemical investigations, soil microbiology, including the testing of cultures procured in the open market for inoculating legumes, other crops, or soil, and if any such samples are found to be impure, nonviable, or misbranded, the results of the tests may be published, together with the names of the manufacturers and of the persons by whom the cultures were offered for sale; for investigations of the causes of soil infertility and the maintenance of soil pro- ductivity; and for investigations within the United States of fer- tilizers, fertilizer ingredients, including phosphoric acid and potash, and other soil amendments, and their suitability for agricultural use, $346,791. Soil survey: For the investigation of soils and their origin, for survey of the extent of classes and types, and for indicating upon maps and plats, by coloring or otherwise, the results of such investi- gations and surveys, $162,582. Sugar-plant investigations: For sugar-plant investigations, includ- ing studies of diseases and the improvement of sugar beets and sugar-beet seed, sugarcane, and other sugar-producing plants, cul- tural and production methods, and the improvement and maintenance of soil fertility in relation to sugar plants, $370,000. Tobacco investigations: For the investigation and improvement of tobacco and the methods of tobacco production and handling, $143,520. BUREAU OF ENTONMOLOGY AND PLANT QUARANTINE SALARIES AND EXPENSES For necessary expenses connected with investigations, experiments, and demonstrations for the promotion of economic entomology, for investigating and ascertaining the best means of destroying insects 437 44 Stat. 1422 . 42 Stat. 1488 . 5 U.S .C. §661;Supp III, § 661 et seq. Beltsville, Md .
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