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21.	Image from Amazon.com	Farming, fertilizers and the nitrate problem / by T. M. Addiscott , A. P. Whitmore and D. S. Powlson. by Addiscott, T. M Whitmore, A. P Powlson, D. S Material type: Text Publication details: Wallingford, Oxon : CAB Internation, c1991 Availability: No items available. Save to lists Add to cart (remove)
22.	Image from Amazon.com	Nitrogen management in irrigated agriculture / Roy S. Rauschkolb, Arthur G. Hornsby. by Rauschkolb, Roy S Hornsby, Arthur G Material type: Text Publication details: New York : Oxford University Press, 1994 Availability: No items available. Save to lists Add to cart (remove)
23.	Image from Amazon.com	Biological nitrogen fixation for sustainable agriculture : extend ed versions of papers presented in the symposium, Role of Biological Ni trogen Fixation in Sustainable Agriculture, at the 13th Congress of Soi l Science, Kyoto, Japan, 1990 / edited by J.K. Ladha, T. George, and B.B. Bohlool. by Ladha, J. K. (Jagdish Kumar), 1952- George, T. (Thomas), 1958- Bohlool, Behzad Ben International Congress of Soil Science (13th : 1990 : Kyoto , Japan) Series: Developments in plant and soil sciences ; v. 49 Material type: Text Publication details: Dordrecht ; Boston : [Los Ban Ìos] : Kluwer Academic Publishers ; International Rice Research Institute, 1992 Online resources: Publisher description Availability: No items available. Save to lists Add to cart (remove)
24.	Image from Amazon.com	Farming, fertilizers and the nitrate problem / by T. M. Addiscott , A. P. Whitmore and D. S. Powlson. by Addiscott, T. M Whitmore, A. P Powlson, D. S Material type: Text Publication details: Wallingford, Oxon : CAB Internation, c1991 Availability: No items available. Save to lists Add to cart (remove)