References
- Adu , SV . 1992 . Soils of the Kumasi Region, Ghana, Memoir No. 8 , 23 – 41 . Soil Research Institute, Academy Post Office .
- Akobundu , IO and Agyakwa , CW . 1987 . A Handbook of West African Weeds , 521 – 521 . Ibadan, Nigeria : UTA .
- Anderson , JM and Ingram , JSI . 1993 . Tropical Soil Biology and Fertility: A Handbook of Methods , 2nd Ed. , 47 – 49 . Oxford : CAB International .
- Andriesse , W . 1985 . “ Wetlands in sub-Saharan Africa, area and distribution ” . In The Wetlands and Rice in Sub-Saharan Africa , Edited by: Juo , ASR and Lowe , JA . 15 – 30 . Ibadan : IITA .
- Annan-Afful , E and Wakatsuki , T . Toposequence as influenced by land use in inland valley watersheds of Ashanti region, Ghana . 14-21 August 2002 , Thailand. pp. 1 – 9 .
- Asiamah , RD . Problems and prospects of agricultural production in Ghana . A paper presented at IIRCAS . 30th September 2002 , Tsukuba, Tokyo. pp. 1 – 6 .
- Asubonteng , KO , Kubota , D , Hayashi , K , Masunaga , T , Andah , EI and Wakatsuki , T . 2001a . Characterization and evaluation of inland valley watersheds for sustainable agricultural production: Case study of semi-deciduous forest zone in the Ashanti Region of Ghana . Tropics , 10 : 539 – 553 .
- Asubonteng , KO , Kubota , D , Hayashi , K , Masunaga , T , Otoo , E and Wakatsuki , T . 2001b . Effect of a sawah-based farming system on rice cultivation in the inland valley bottom of the Ashanti region . Ghana. Tropics , 10 : 555 – 564 .
- Brady , NC and Weil , RR . 2002 . The Nature and Properties of Soils , 13th Ed. , 960 pp. – 960 pp. . Upper Saddle River, New Jersey : Prentice Hall .
- Bray , RH and Kurtz , LT . 1945 . Determination of total, organic and available forms of phosphorus in soil . Soil Sci. , 59 : 39 – 45 .
- Dekuku , RC , Amankwatia , YO , Asubonteng , KO and Nartey , L . Inland valley research in sub-Saharan Africa. Priorities for a regional consortium . Proceedings of the 1st Annual Workshop of the Inland Valley Consortium . June 8-10 1993 , WARDA, Bouake, Cote d'Ivoire. pp. 65 – 71 .
- Fageria , NK , Baligar , VC and Jones , CA . 1997 . Growth and Mineral Nutrition of Field Crops , 2nd Ed. , 283 – 343 . New York : Marcel Dekker Inc. .
- Gobin , A , Campling , P , Deckers , J and Feyen , J . 2000 . Integrated toposequence analyses to combine local and scientific knowledge systems . Geoderma , 97 : 104 – 118 .
- Hall , JB and Swaine , MD . 1976 . Classification and ecology of closed-canopy forest in Ghana. . T. Ecol. , 64 : 913 – 951 .
- Hirose , S and Wakatsuki , T . 1997 . Restoration of Ecology and Rural Life in Savanna Zone of West Africa , 506 – 506 . Tokyo : Norin Tokei Kyoukai (Association of Agriculture and Forestry Statistics) . (in Japanese)
- Hirose , S and Wakatsuki , T . 2002 . Restoration of Inland Valley Ecosystems in West Africa , 600 – 600 . Tokyo : Association of Agriculture and Forestry Statistics .
- UTA^ . 1979 . Selection Methods for Soil and Plant Analysis, Manual Series No. I , 70 – 70 . Ibadan .
- ISSS^ . 1994 . World Reference Base for Soil Resources , 161 cmdraft – 161 cmdraft . New York : ISSS / ISRIC / FAO .
- Koyama , T and Sutoh , M . 1987 . Simultaneous multielement determination of soils, plant and animal samples by inductively coupled plasma emission spectrometry . Jpn. J. Soil Sci. Plant Nutr. , 58 : 578 – 585 .
- Kyuma , K and Wakatsuki , T . 1995 . “ Ecological and economic sustainability of paddy rice systems in Asia ” . In Agriculture and Environment: Bridging Food Production and Environmental Protection in Developing Countries , Edited by: Juo , AS and Freed , RD . 139 – 159 . Madison : ASA .
- Manu , A , Coleman , TL and Juo , ASR . Soil restoration in degraded agro-pastoral systems of semi-arid West Africa . Proceedings of the Regional Workshop, Soil Fertility Management in West African Land Use Systems, University of Hohenheim, ICRISAT Sahelian Centre and INRAN . 4-8, March 1997 , Niamey, Niger. pp. 176 – 177 .
- Masunaga , T , Kubota , D , Hotta , M and Wakatsuki , T . 1998a . Mineral composition of leaves and barks in aluminum accumulators in a tropical rain forest in Indonesia . Soil Sci. Plant Nutr. , 44 : 347 – 358 .
- Masunaga , T , Kubota , D , William , U , Hotta , M , Shinmura , Y and Wakatsuki , T . 1998b . Spatial distribution pattern of trees in relation to soil edaphic status in tropical rain forest in West Sumatra, Indonesia I. Distribution of accumulating trees . Tropics , 7 : 209 – 222 .
- Ochiai , A . 2002 . “ On-farm demonstration studies for the restoration of ecological environment and rural life ” . In In Restoration of Inland Valley Ecosystems in West Africa , Edited by: Hirose , S and Wakatsuki , T . 488 – 497 . Tokyo : Association of Agriculture and Forestry Statistics .
- Page AL Miller RH Keeney DR Methods of Soil Analysis {cxMadison} Madison 1971 9|{txPart 2} 543 553
- Quaker , NR , Klucker , PD and Chang , GN . 1970 . Calibration of inductively coupled plasma emission spectrometry for analysis of the environmental materials . Anal. Chem. , 51 : 885 – 895 .
- Ruthenberg , H . 1980 . Farming Systems in the Tropics , 3rd Ed. , 41 – 43 . New York : Oxford University Press .
- SAS^ . 1999 . Using StatView , 3rd Ed. , 288 – 288 . Cary : Statistical Analytical System (SAS) Inc. .
- Wakatsuki , T , Otoo , E , Andah , WEI , Cobbina , J , Buri , MM and Kubota , D . 2001 . Final Report, IICA / CRI Joint Study Project on Integrated Watershed Management of Inland Valleys in West Africa, Eco-Technology Approach, Ghana , 9 – 13 . Tokyo : IICA .
- http://www.grida.no/climate/ipcc/land_use
- Windmeijer , PN and Andriesse , W , eds. 1993 . “ Inland Valleys in West Africa: An Agro-Ecological Characterization of RiceGrowing Environments ” . In ILRI Publication 52 , 160 – 160 . Wageningen : International Institute for Land Reclamation and Improvement .