53 STAT.] 76TH CONG. , 1ST SESS.-CH. 253 -JUNE 30, 1939 for investigations of diseases of forest trees and forest products, under section 3 of the Act approved May 22, 1928 (16 U. S . C . 581b), $265,392. Fruit and vegetable crops and diseases: For investigation and con- trol of diseases, for improvement of methods of culture, propagation, breeding, selection, and related activities concerned with the produc- tion of fruits, nuts, vegetables, ornamentals, and related plants, for investigation of methods of harvesting, packing, shipping, storing and utilizing these products, and for studies of the physiological and related changes of such products during processes of marketing and while in commercial storage, $1,348,982. Genetics and biophysics: For biophysical investigations in connec- tion with the various lines of work herein authorized, $31,675. 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, $152,674. Mycology and disease survey: For mycological collections and the maintenance of a plant-disease survey, $45,818. 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), erection of buildings, employment of persons and means in the city of Washington and elsewhere, and traveling expenses of employees and advisory council, $54,587, of which such amounts as may be necessary may be expended by con- tract or otherwise for the services of consulting landscape architects without reference to the Classification Act of 1923, as amended, or civil-service rules. Nematology: For crop technological investigations, including the study of plant-infesting nematodes, $48,961. Plant exploration and introduction: For investigations in seed and plant introduction, including the study, collection, purchase, testing, propagation, and distribution of rare and valuable seeds, bulbs, trees, shrubs, vines, cuttings, and plants from foreign countries and from our possessions, and for experiments with reference to their introduction and cultivation in this country, $200,933: Provided, That not to exceed $1,400 of this amount may be expended for the purchase of approximately twenty acres of land to enlarge the United States Plant Introduction Garden at Glenn Dale, Maryland. Plant nutrition: For plant-nutrition investigations, $16,024. Rubber and other tropical plants: For investigation of crops from tropical regions and for the study and improvement of rubber plants by cultural methods, breeding, acclimatization, adaptation, and selec- tion, and for investigation of their diseases, $46,749. Soil chemical and physical investigations: For chemical, physical, and physical-chemical investigations of soil types, soil composition, and soil minerals, the soil solution, solubility of soil, and all chem- ical and physical properties of soils in their relation to soil forma- tion, soil texture, erosibility, and soil productivity, $76,700. Soil-fertility investigations: For soil investigations into causes of infertility; maintenance of productivity; effects of soil composition, cultural methods, and fertilizers on yield and quality of crops; and the properties, composition, formation, and transformation of soil organic matter, $121,622. Soil microbiology investigations: For investigations of the micro- organisms of the soil and their activities, including the testing of samples procured in the open market, of cultures for inoculating legumes, other crops, or soil, and the publication of results, and if 953 45 Stat. 701. 16 U. S. C. 581b. Fruit and vegetable crops and diseases. Genetics and bio- physics. Irrigation agricul- ture. Mycology and dis- ease survey. National Arbore- tum. 44 Stat. 1422. 20U. .c. I.191- 194. Consulting land- scape architects. 5U.S. C . §661-674; Supp. IV, §§ 673, 673c. Nematology. Plant exploration and introduction. Proviso. Glenn Dale, Md., additional land. Plant nutrition. Rubber, etc., plants. Soil chemical and physical investiga- tions. Soil-fertility investi- gations. Soil microbiology in. vestigations.
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