Ecology and Natural Resources Management (ECOL)

1998

Bationo, A., and P.L.G. Vlek.  1998.  The Role of Nitrogen Fertilizers Applied to Food Crops in the Sudano-Sahelian Zone of West Africa.  In: Renard, G., Neef, A., Becker, K. and von Oppen, M. (eds.): Soil Fertility Management in West African Land Use Systems. Proc. Regional Workshop Univ. Hohenheim, ICRISAT Sahelian Centre and INRAN 4-8 March 1997, Niamey, Niger. Margraf, Weikersheim.   41-51. 
Sanetra, C.M., O. Ito, S.M. Virmani, and P.L.G. Vlek.  1998.  Remobilization of nitrogen from senescing leaves of pigeonpea (Cajanus cajan (L.) Millsp.): genotypic differences across maturity groups.  J. Exp. Bot., 49 (322)   : 853-862   .
Wick, B., R.F. Kühne, and P.L.G. Vlek.  1998.  Soil microbiological parameters as indicators of soil quality under improved fallow management systems in south-western Nigeria.  Plant and Soil, 202, 1998   : 97-107   .

1997

Vlek, P.L.G., R.F. Kühne, and M. Denich.  1997.  Nutrient resources for crop procution in the tropics.  Phil. Trans. R. Soc. Lond., B 352   : 975-985   .
Wiesenmüller, J., M. Denich, and P.L.G. Vlek.  1997.  Bedeutung des Wurzelsystems für die Regeneration der Brachevegetation in Nordost-Brasilien. (Significance of the root system for the regeneration of the fallow vegetation on N. E. Brazil).  In: W. Merbach (eds.): Rhizosphärenforschung, Umweltstreß und Ökosystemstabilität. B.G. Teubner Verlagsges. Stuttgart.   84-89. 

1996

Edi Premono, M., A.M. Moawad, and P.L.G. Vlek.  1996.  "Effect of phosphate-solubilizing Pseudomonas putida on the growth of maize and its survival in the rhizosphere".  Indones. J. Crop Sci., 11 (1)   : 13-23   .

1982

El-Zahaby, E.M., S.H. Chien, N.K. Savant, P.L.G. Vlek, and A.U. Mokwunye.  1982.  Effect of Pyrophosphate on Phosphate Sorption and Ammonia Volatilization by Calcareous Soils Treated with Ammonium Phosphates.  Soil Sci. Soc. Am. J., 46   : 733-740   .

Other

Salmon, J.M., M.A. Friedl, S. Frolking, D. Wisser, E.M. Douglas.  Global rain-fed, irrigated, and paddy croplands: A new high resolution map derived from remote sensing, crop inventories and climate data.  International Journal of Applied Earth Observation and Geoinformation , 38   : 321-334   .

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