细化搜索
结果 1-10 的 25
Trends in agricultural production, costs, and returns in Utah
1950
Thomas, W. Preston (William Preston)
Kulʹtura chumizy i ispolʹzovanie ee dli︠a︡ khozi︠a︡ | Foxtail millet culture and its utilization in agricultural production
1950
Tkachenko, M. E. | Buchat︠s︡kiĭ, M. A.
Milk production records of pure Jersey and part Jersey cows in the Agricultural Department of Assiut College
1950
McFeeters, M. C.
Swine production
1950
Carroll, W. E. (William Ernest) | Krider, J. L. (Jake Luther)
Calculo de volúmenes de excavación
1950
Cárdenas Padilla, Francisco | Rodríguez Dávila, Roberto
"En las concesiones de explotaciones mineras revisten una marcada importancia los peritajes de comprobaciones anuales de acuerdo con la constitución general de la republica pues de ellos depende el reconocimiento que guardan físicamente esas pertenencias"
显示更多 [+] 显示较少 [-]Obtención de maíz resistente a: (fusarium moniliforme sheld)
1950
Murillo Peralta, Gabriel
"El maíz ha sido desde la época pre-cartesiana la base de la alimentación de nuestro pueblo; pero no fue si no hasta que hace años que inicio el gobierno un programa del mejoramiento de planta"
显示更多 [+] 显示较少 [-]Profitable broiler production in Indiana
1950
Johnson, Hugh A. (Hugh Albert) | Gordeuk, Alexander | Robertson, Lynn (Lynn Shelby)
Ning-po chuan chʻü nung yeh sheng chʻan ching yen chieh shao | Introduction to the experience of agricultural production in the Ningpo Special District
1950
Liu, Tsu-hsiang
East African Inland Fisheries Research Organization Annual Report for year ended 31st December 1949
1950
East African Inland Fisheries Research Organization
The present work is now concentrated mainly on the Tilapia fishery. As a result of past experience it is easier to direct efforts in a way likely to give useful results. Work on the Tilapia is now beyond the purely exploratory stage and these fishing experiments are being carried but in areas which are known to contain large numbers of Tilapia. Nets of different mesh size are being used in order to catch all stages of these fish. These nets are being fished at the surface and at the bottom, close to the shore and further out. The data collected should provide more precise information regarding the periodic migration, both vertical and horizontal, of these fish, a better understanding of their life history and breeding habits, and indicate' the potential possibilities of this fishery. These data should explain the variation in numbers of fish caught by Africans during different months of the year; they should also make it possible to determine more exactly the best type of net for use in this particular fishery.
显示更多 [+] 显示较少 [-]Annual Report of the Game Department for the year ended 31st December 1949
1950
Game Department, Uganda Protectorate
The fisheries section of the Annual report provides information on the following:(1) General information(2) Legislation(3) Nets(4) Imports and Exports of Dried FishB) Economic:-(1) Lake Victoria(2) Lake Albert (including the Albert Nile)(3) Report by Lake Albert Fisheries Officer(4) Lake Edward and Associated Fisheries(5) Lake Kyoga(6) Minor Lakes and the Victoria Nile(7) Dams and(8)Fish Transfers
显示更多 [+] 显示较少 [-]