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Transition from extensive to intensive agriculture with fertilizers : proceedings of the VIIth colloquium of the International potash institute held in Israel, 1969 / [contrib. by K. Mengel...et al.].
- 859.4
- International potash institute,
- 1969.
- Bern :
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Nutrient balances and the need for fertilizers in semi-arid regions : proceedings of the 17th colloquium of the International potash institute held in Rabat and Marrakech/Morocco / [contrib. by M.V.K. Sivakumar...et al.].
- International potash institute,
- 1983.
- Bern :
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Nutrient balances and the need for fertilizers in semi-arid and arid regions : proceedings of the 17th colloquium of the International potash institute held at Rabat and Marrakech, Morocco 1983 / [contrib. by M.V.K. Sivakumar...et al.].
- International potash institute,
- 1983.
- Bern :
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Soils in the Mediterranean type climates and their yield potential : proceedings of the 14th colloquium of the International potash institute, held in Sevilla, Spain 1979 / P. Quintanilla...[et al.].
- 840.2
- International potash institute,
- 1979.
- Bern :
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Optimizing yields : the role of fertilizers : proceedings of the 12th IPI-congress, June 1982 at Goslar, Federal republic of Germany
- International potash institute,
- 1982.
- Bern :
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Physiological aspects of crop productivity : proceedings of the 15th colloquium of the International potash institute, held in Wageningen, 1980 / [contrib. by F.G.H. Lupton...et al.].
- International potash institute,
- 1980.
- Bern :