Phosphate rock as a direct application fertilizer : Can it help to relieve food shortage in some low income developing countries?

von Lüken, Halo
Geologisches Jahrbuch, Reihe F 17
Stuttgart : Schweizerbart, 1984.
Umfang/Format: 27 S. : Abb. ; 24 cm.

Investigations on the development potential of Oxisols of the Chapada Grande, Puauí, Brazil.

von Lüken, Halo
Geologisches Jahrbuch, Reihe F 15
Stuttgart : Schweizerbart, 1983.
Umfang/Format: 54 S. : Abb. ; 24 cm.