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- United States. Dept. of Agriculture (8)
- JIRCAS International Symposium (7)
- 農林水産省国際農林水産業研究センター (5)
- 国際農林水産業研究センター (4)
- 亜熱帯総合研究所 (3)
- Arnold, Florence A. (2)
- Lewis, Hazel L. (2)
- 矢島, 正晴 (2)
- 鶴見, 和幸 (2)
- Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts (1)
- American Society of Agronomy (1)
- Asian and Pacific Council. Food & Fertilizer Technology Center (1)
- Asian-Pacific Weed Science Society. Conference (1)
- Brady, Nyle C. (1)
- Bromfield, Louis, 1896-1956 (1)
- Edwards, C. A. (Clive Arthur), 1925- (1)
- Goering, Carroll E. (1)
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- Higbee, Edward Counselman, 1910- (1)
- Highley, Ed (1)
- International Conference on Agriculture and the Environment (1991) (1)
- International Crops Research Institute for the Semi-Arid Tropics (1)
- International Students Summit (1)
- International Workshop : Dynamics of Roots and Nitrogen in Cropping Systems of the Semi-Arid Tropics (1)
- Iowa State University. College of Agriculture (1)
- Ng'ambi, Tenson Boyd S. (1)
- Norman, A. G. (Arthur Geoffrey), 1905- (1)
- Rohrbach, Roger P. (1)
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- Tabb, W. R. (1)
- Tolley, Howard R. (1)
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- Wilcox, Earley Vernon (1)
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- 国分, 牧衛(1950-) (1)
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- 東京農業大学 (1)
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