Application of inorganic phosphorus fertilizer

Sustaining Soil Fertility in West Africa

Volumn , Issue , 2015, Pages 225-246

  Sahrawat, Kanwar L ^a   Abekoe, Mark K ^b   Diatta, Sitapha ^a  

^a WARDA   (Côte d’Ivoire)

^b UNIVERSITY OF GHANA   (Ghana)

Author keywords

Crop yields; Inorganic phosphorus fertilizer; Manure application; Phosphate rocks; Soil fertility; West Africa

Indexed keywords

EID: 85102021186     PISSN: None     EISSN: None     Source Type: Book    
DOI: 10.2136/sssaspecpub58.ch11     Document Type: Chapter

References (108)

1. Abekoe, M.K., and K.L. Sahrawat. 2001. Phosphate retention and extractability in soils of the humid zone in West Africa. Geoderma.
2. Adams, F. 1980. Interactions of phosphorus with other elements in soil and plants. p. In F.E. Khasawneh et al. (ed.) The role of phosphorus in agriculture. ASA, Madison, WI, USA.
3. Adediran, J.A., F.J. Oguntoyinbo, R. Omonode, and R.A. Sobul. 1998. Evaluation ofp hosphorus avail- ability from three sources in Nigerian soils. Commun. Soil Sci. Plant Anal.
4. Ae, N., K. Okada, T. Yoshihara, and C. Johansen. 1990. Phosphorus uptake by pigeonpea and its role in cropping systems of the Indian subcontinent. Science (London) 248:477-480.
5. Ae, N. T. Otani, and J. Arihara. 1995. Effects of specific compounds exuded from roots on phosphorus nutrition. p. In C. Johansen et al. (ed.) Genetic manipulation of crop plants to enhance integrated nutrient management in cropping systems-phosphorus. Int. Crops Res. Inst. for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India.
6. Ae, N., T. Otani, T. Makino, and J. Tazawa. 1996. Role of cell wall of groundnut roots in solubilizing sparingly soluble phosphorus in soil. Plant.
7. Ankomah, A.B., F. Zapata, S.K.A. Danso, and H. Axmann. 1995. Cowpea varietal differences in up- take of of phosphorus from Gasfa phosphate rock in a low-P Ultisol. Fert. Res.
8. Asea, P.E.A., R.M.N. Kucey, and J.w.B. Stewart. 1988. Inorganic phosphate solubilization by two peni- cillium species in solution culture and soil. Soil BioI. Biochem. 20:459-464.
9. Attiogbevi-Somado, E. 2000. The use of phosphate rock in a rice-legume rotation system on acid soil in the humid forest zone of West Africa. Doctoral Diss., Georg-August-Univ. of Goetting en, Ger- many.
10. Bache, B.w., and J.A.M. Ross. 1991. Effect of phosphorus and aluminium in the response of spring bar- ley to soil acidity. J. Agric. Sci. (Cambridge).
11. Bardiya, M.C., and A.C. Gaur. 1974. Isolation and screening of microorganisms dissolving low-grade rock phosphate. Folia Microbiol. 19:386-389.
12. Bationo, A., E. Ayuk, D. Ballo, and M. Kone. 1997. Agronomic and economic evaluation of Tilemsi phosphate rock in different agroecological zones of Mali. Nutrient Cycl. Agroecosyst.
13. Bationo, A., S.K. Mughogho, and A.U. Mokwunye. 1986. Agronomic evaluation of phosphate fertil- izers in tropical Africa. p. In A.U. Mokwunye and P.L.G. Vlek (ed.) Management of nitrogen and phosphorus fertilizers in sub-Saharan Africa. Martinus Nijhoff Publ., Dordrecht, the Netherland s.
14. Becker, M., and D.E. Johnson. 1999. The role oflegume fallows in intensified upland rice-based sys- tems of West Africa. Nutrient Cycl. Agroecosyst. 53:77-81.
15. Black, C.A. 1993. Soil fertility evaluation and control. Lewis Publ., Boca Raton, FL.
16. Bolan, N.S., R.E. White, and MJ. Hedley. 1990. A review of the use of phosphate rocks as fertilizers for direct application in Australia and New Zealand. Austr. J. Exp. Agric. 30:297-313.
17. Bolland , M.D.A., and RJ. Gilkes. 1990. Rock phosphates are not effective fertilizers in Western Aus- tralian soils: A review of one hundred years of research. Fert. Res. 22:79-95.
18. Buerkert, A., A. Bationo, and K. Dossa. 2000. Mechanisms of residue mulch-induced cereal growth in- creases in West Africa. Soil Sci. Soc. Am. J. 64:346-358.
19. Buresh, RJ., P.C. Smithson, and D.T. Hellums. 1997. Building phosphorus capital in Africa. p. 111-149. In RJ. Buresh et al. (ed.) Replenishing soil fertility in Africa. SSSA Spec. Publ. 51. SSSA, Madi- son, WI.
20. Buresh, RJ., and G. Tian. 1998. Soil improvement by trees in sub-Saharan Africa. Agrofor. Syst. 38:51-76.
21. Chien, S.H., and D.K. Friesen. 2000. Phosphate fertilizers and management for sustainable crop pro- duction in tropical acid soils. p. 73-89. In Management and conservation of tropical acid soils for sustainable crop production. Proc. of a Consultants' Meeting organized by Joint FAO/IAEA Division of Nuclear Techniques, Vienna, Austria. 1-3 Mar. 1999. IAEA-TECDOC 1159. Int. Atomic Energy Agency, Vienna, Austria.
22. Chien, S.H., and L.L. Hammond. 1988. Agronomic evaluation of pPartially acidulated phosphate rocks in the tropics: IFDC Experience. IFDC -P-7. Int. Fertilizer Develop. Center, Muscle Shoals, AL.
23. Chien, S.H., and R.G. Menon. 1995. Factors affecting the agronomic effectiveness of phosphate rock for direct application. Fert. Res. 41:227-234.
24. Chien, S.H., and R.G. Menon. 1995. Agronomic evaluation of modified phosphate rock products. Fert. Res. 41:197-209.
25. Chien, S.H., R.G. Menon, and K.S. Billingham. 1996. Phosphorus availability from phosphate rock as enhanced by water-soluble phosphorus. Soil Sci. Soc. Am. J. 60: 1173-1177.
26. Chien, S.H., D. Sompongse, J. Henao, and D.T. Hellums. 1987. Greenhouse evaluation of phosphorus availability from compacted phosphate rocks with urea and triple superphosphate. Fert. Res.14:245-256.
27. Chien, S.H., and SJ. Van Kauwenbergh. 1992. Chemical and mineralogical characteristics of phosphate rock for direct application. p. 3-31. In R.R. Campillo (ed.) First national seminar on phosphate rocks in agriculture. Serie Carillanca no. 29. Inst. de Investigaciones Agropecuarios, Temuco, Chile.
28. Deckers, J. 1993. Soil fertility and environmental problems in different ecological zones of the devel- oping countries in sub-Saharan Africa. p. 37-52. In H. van Reuler and W.H. Prins (ed.) The role of plant nutrients and sustainable food production in sub-Saharan Africa. Vereniging van Kun- stmest Producenten, Leidschendam, the Netherland s.
29. Doumbia, M.D., M. Ouattara, L.R. Hossner, and A.B. Onken. 1992. Phosphorus status and sorption in sand y soils of the Sahel region of West Africa. p. 45-58. In Proc. of the Tropsoils Phosphorus Decision Support System Workshop, College Station, TX. 11-12 Mar. 1992. Trop. Soils Bull. 92-0 I. Dep. of Agronomy and Soil Sci., College ofTrop. Agric. and Human Resourc., Univ. of Hawaii, Honolulu, Hawaii.
30. Fageria, N.K., RJ. Wright, and VC. Baligar. 1988. Rice cultivar evaluation for phosphorus use effi- ciency. Plant Soil 111: 105-109.
31. Foy, C.D. 1992. Soil chemical factors limiting plant root growth. Adv. Soil Sci.19:97-149.
32. Gilkes, RJ., and M.D.A. Bolland. 1994. Australian field and glasshouse research with rock phosphates: History, explanations and current developments. Terra 12(1):79-105.
33. Giller, K.E., G. Cadisch, C. Ehaliotis, E. Adams, W.D. Sakala, and P.L. Mafongoya. !997. Building soil nitrogen capital in Africa. p. 151-192. In RJ. Buresh et al. (ed.) Replenishing soil fertility in Africa. Soil Sci. Soc. Spec. Publ. 51. SSSA, Madison, WI.
34. Hammond, L.L., S.H. Chien, and A.U. Mokwunye. 1986. Agronomic value of un acidulated and par- tially acidulated phosphate rocks indigenous to the tropics. Adv. Agron. 40:89-140.
35. Hellums, D.T., S.H. Chien, and J.T. Touchton. 1989. Potential agronomic value of calcium in some phos- phate rocks from South America and West Africa. Soil Sci. Soc. Am. J. 53:459-462.
36. Helyar, K.R. 1991. The management of acid soils. p. 365-382. In RJ. Wright et al. (ed.) Plant-soil in- teraction at low pH. Kluwer Academic Publ., Dordrecht, the Netherland s.
37. Horst, W.J. 2000. Fitting maize into sustainable cropping systems on acid soils of the tropics. p. 47-59. In Management and conservation of tropical acid soils for sustainable crop production. Proc. of a Consultants Meeting organized by joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Vienna, Austria. 1-3 Mar. 1999. IAEA-TECDOC 1159. Int. Atomic Energy Agency, Vienna, Austria.
38. Hu, H.Q., X.Y. Li, J.E Liu, F.L. Xu, J. Liu, and E Liu. 1997. The effect of direct application of ph os- phate rock on increasing crop yield and improving properties of red soil. Nutrient Cycl. Agroe- cosyst. 46:235-239.
39. Iyamuremye, E, and R.P. Dick. 1996. Organic amendments and phosphorus sorption by soils. Adv. Agron.56:139-185.
40. Jama, B., R.I. Buresh, and EM. Place. 1998. Sesbania tree fallows on phosphorus-deficient sites: Maize yield and financial benefit. Agron. J. 90:717-726.
41. Jama, B., R.A. Swinkels, and R.I. Buresh. 1997. Agronomic and economic evaluation of organic and inorganic sources of phosphorus for maize. Agron. J. 89:597-604.
42. Johansen, C., G.Y. Subbarao, K.K. Lee, and K.K. Sharma. 1995. Genetic manipulation of crop plants to enhance integrated nutrient management in cropping systems-The case of phosphorus. p. 9-29. In C. Johansen et al. (ed.) Genetic manipulation of crop plants to enhance integrated nu- trient management in cropping systems -I. Phosphorus. Int. Crops Res. Inst. for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India.
43. Johnson, A.K.C. 1995. Inventory and mining oflocal mineral resources in West Africa. p. 21-40. In H. Gerner and A.U. Mokwunye (ed.) Use of phosphate rock for sustainable agriculture in West Africa. Misc. Fertilizer studies no. 11. Int. Fertilizer Develop. Center-Africa, Lome, Togo.
44. Juo, A.S.R., and R.L. Fox. 1977. Phosphate sorption characteristics of some benchmark soils of West Africa. Soil Sci. 124:370-376.
45. Kagbo, R.B. 1991. A comparison of natural phosphate rock with imported cotton fertilizer in cotton/ce- real rotation in Mali. Expt. Agric. 27:263-268.
46. Kamh, M., WJ. Horst, E Amer, H. Mostafa, and P. Maier. 1999. Mobilization of soil and fertilizer phos- phate by cover crops. Plant Soi1211: 19-27.
47. Kang, B.T., and A.S.R. Juo. 1979. Balanced phosphorus fertilization in humid West Africa. p. 75-85. In Phosphorus in agriculture no. 76. Proc. of the ISMA symposium, Mohammedia, Morocco. 13-14 Mar. 1979. Marbeuf-75008, Paris, France.
48. Kaola, S., J.R. Sims, H. El-Altar, and M. EI-Halfawi. 1988. Phosphorus deficiency in the semiarid trop- ics and implications for grain legume production. p. 205-216. In R.J. Summerfield (ed.) World crops: Cool season legumes. Kluwer Academic Publ., London.
49. Khasawneh, EE., and B.C. Doll. 1978. The use of phosphate rock for direct application to soils. Adv. Agron.30:159-205.
50. Koyama, T., and C. Chamnek. 1971. Soil-plant nutrition studies on tropical rice soil. J. Studies on the varietal differences in absorbing phosphorus from soil low in available phosphorus. Soil Sci. Plant Nutr. (Tokyo) 17:115-126.
51. Kpomblekou, K., S.H. Chien, J. Henao, and WA. Hill. 1991. Greenhouse evaluation of phosphate fer- tilizers produced from Togo phosphate rocks. Commun. Soil Sci. Plant Anal. 22:63-73.
52. Kpomblekou-A, K., and M.A. Tabatabai. 1994. Effect of organic acids on release of phosphorus from phosphate rocks. Soil Sci. 158:442-453.
53. Linquist, B.A., P.W Singleton, and K.G. Cassman. 1997. Inorganic and organic phosphorus dynamics during a build-up and decline of available phosphorus in an Ultisol. Soil Sci. 162:254-264.
54. Linquist, B.A., P.W Singleton, K.G. Cassman, and K. Keane. 1996. Residual phosphorus and long-term management strategies for an Ultisol. Plant Soil 184:47-55.
55. Lupin, M.S., and N.D. Le. 1983. Compaction, An alternative approach for granular fertilizers. IFDC- T-25. Int. Fertilizer Develop. Center, Muscle Shoals, AL.
56. Mahimairaja, S., N.S. Bolan, and M.J. Hedley. 1995. Dissolution of phosphate rock during the com- posting of poultry manure: An incubation experiment. Fert. Res. 40:93-104.
57. Maroko, J.B., R.J. Buresh, and P.C. Smithson. 1999. Soil phosphorus fractions in unfertilized fal- low-maize systems on two tropical soils. Soil Sci. Soc. Am. J. 63:320-326.
58. Menon, R.G., and S.H. Chien. 1990. Phosphorus availability to maize from partially acidulated phos- phate rocks and phosphate rocks compacted with triple superphosphate. Plant Soil 127: 123-128.
59. Mishra. M.M., and K.C. Bangar. 1986. Rock phosphate composting: Transformation of phosphorus forms and mechanisms of solubilization. BioI. Agric. Hortic. 3:331-340.
60. Mokwunye, A. U. 1995. Reactions in soils involving phosphate rocks. p. 84-92. In H. Gerner and A.U. Mokwunye (ed.) Use of phosphate for sustainable agriculture in West Africa. Misc. Fertilizer Studies no. II. Int. Fertilizer Develop. Center-Africa, Lome, Togo.
61. Mokwunye, A. U. 1995. Phosphate rock as capital investment. p. 100-105. In H. Gerner and A.U. Mok- wunye (ed.) Use of phosphate rock for sustainable agriculture in West Africa. Misc. Fertilizer Studies no. II. Int. Fertilizer Develop. Center, Lome, Togo.
62. Mokwunye, A.U., S.H. Chien, and E. Rhodes. 1986. Phosphorus reactions with tropical African soils. p. 253-281. In A.U. Mokwunye and P.L.G. Vlek (ed.) Management of nitrogen and phospho- rus fertilizers in sub-Saharan Africa. Martinus NijhoffPubl., Dordrecht, the Netherland s.
63. Mokwunye, A.U., A. de Jager, and E.M.A. Smaling (ed.) 1996. Restoring and maintaining the pro- ductivity of West African Soils: Key to sustainable development. Misc. Fertilizer Studies no. 14. Int. Fertilizer Develop. Center-Africa, Lome, Togo.
64. Mutuo, P.K., P.C. Smithson, R.J. Buresh, and RJ. Okalebo. 1999. Comparison of phosphate rock and triple superphosphate on a phosphorus-deficient Kenyan soil. Commun. Soil Sci. Plant Anal. 30:1091-1103.
65. Nziguheba, G., C.A. Palm, RJ. Buresh, and P.C. Smithson. 1998. Soil phosphorus fractions and ad- sorption as affected by organic and inorganic sources. Plant Soil 198:159-168.
66. Osman, A.E. 1997. Potential benefits of phosphorus fertilizer on marginal land s. p. 154-161. In J. Ryan (ed.) Accomplishment and future challenges in dryland soil fertility research in the mediterranean area. Proc. of the Soil Fertility Workshop organized by World Phosphate Inst. and ICARDA, 19-23 Nov. 1995. Int. Center for Agric. Res. in the Dry Areas, Aleppo, Syria.
67. Osman, A.E., P.S. Cocks, L. Russi, and M.A. Pagnotta. 1991. Response of Mediterranean grassland to phosphate and stocking rates: Biomass production and botanical composition. J. Agric. Sci. (Cam- bridge) 116:37-46.
68. Owusu-Bennoah, E., and D.K. Acquaye. 1989. Phosphate sorption characteristics of selected major Ghanaian soils. Soil Sci. 148:114-123.
69. Owusu-Bennoah, E., C. Szilas, H.C.B. Hansen, and O.K. Borggaard. 1997. Phosphorus sorption in re- lation to aluminum and iron oxides of Oxisols from Ghana. Commun. Soil Sci. Plant Anal. 28:685-697.
70. Palm, C.A., RJ.K. Myers, and S.M. Nand wa. 1997. Combined use of organic and inorganic nutrient sources for soil fertility maintenance and replenishment. p. 193-217. In RJ. Buresh et al. (ed.) Replenishing soil fertility in Africa. SSSA Spec. Publ. 51. SSSA, Madison, WI.
71. Prakash, T.R., and M.S. Badrinath. 1995. Utilization of rock phosphate as a source of phosphorus and calcium in acid soil. J. Indian Soc. Soil Sci. 43: 474-475.
72. Rajan, S.S.S., lH. Watkinson, and A.G. Sinclair. 1996. Phosphate rocks for direct application to soils. Adv. Agron. 57:77-159.
73. Rand all, PJ. 1995. Genotypic differences in phosphorus uptake. p. 31-47. In C. Johansen et al. (ed.) Genetic manipulation of crop plants to enhance integrated nutrient management in cropping sys- tems-Phosphorus. Int. Crops Res. Inst. for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India.
74. Rao, I.M., D.K. Friesen, and M. Osaki. 1999. Plant adaptation to phosphorus-limited tropical soils. p. 61-95. In M. Pessarakli (ed.) Hand book of plant and crop stress. 2nd ed. Marcel Dekker, New York.
75. Roy, P., J.C. Tarafdar, and A.P. Singh. 1999. Enhancing phosphorus release from Mussoorie rock phos- phate by blending with organic materials and phosphate solubilizers. J. Indian Soc. Soil Sci. 47:372-375.
76. Sahrawat, K.L. 1994. Fertility and chemistry of rice soils in West Africa. State of the art paper. West Africa Rice Develop. Assoc., 01 BP 2551, Bouake, Cote d'Ivoire.
77. Sahrawat, K.L. 2000. Residual phosphorus and management strategy for grain sorghum on a Vertisol. Commun. Soil Sci. Plant Anal. 31 :3103-3112.
78. Sahrawat, K.L., M.P. Jones, and S. Diatta. 1995. Response of upland rice to phosphorus in an Ultisol in the humid forest zone of West Africa. Fert. Res. 41:11-17.
79. Sahrawat, K.L., M.P. Jones, and S. Diatta. 1997. Direct and residual phosphorus effects on yield and phosphorus efficiency of upland rice in an Ultisol. Nutrient Cycl. Agroecosyst. 48:209-215.
80. Sahrawat, K.L., M.P. Jones, and S. Diatta. 1997. Extractable phosphorus and rice yield in an Ultisol of the humid forest zone in West Africa. Commun. Soil Sci. Plant Anal. 28:711-716.
81. Sahrawat, K.L., M.P. Jones, and S. Diatta. 1998. Plant phosphorus and rice yield in an Ultisol of the humid forest zone in West Africa. Commun. Soil Sci. Plant Anal. 29:997-1005.
82. Sahrawat, K.L., M.P. Jones, and S. Diatta. 1999. Phosphorus, calcium, and magnesium fertilization ef- fects on upland rice in an Ultisol. Commun. Soil Sci. Plant Anal. 30:1201-1208.
83. Sahrawat, K.L., M.P. Jones, and S. Diatta. 2000. The role of tolerant genotypes and plant nutrients in the management of acid soil infertility in upland rice. p. 29-43. In Management and conserva- tion of tropical acid soils for sustainable crop production. Proc. of a Consultants Meeting orga- nized by joint FAOIIAEA Division of Nuclear Techniques in Food and Agriculture, Vienna, Aus- tria. 1-3 Mar. 1999. IAEA-TECDOC 1159. Int. Atomic Energy Agency, Vienna, Austria.
84. Sahrawat, K.L., TJ. Rego, lR. Burford, M.H. Rahman, lK. Rao, and A. Adam. 1995. Response of sorghum to fertilizer phosphorus and its residual value in a Vertisol. Fert. Res. 41 :41-47.
85. Sale, P.w.G., and A.U. Mokwunye. 1993. Use of phosphate rocks in the tropics. Fert. Res. 35:33-45.
86. Sanchez, P.A., and G. Uehara. 1980. Management considerations for acid soils with high phosphorus fixation capacity. p. 471-514. In F.E. Khasawneh et al. (ed.) The role of phosphorus in agricul- ture. ASA, Madison, WI.
87. Sanchez, P.A., and J.G. Salinas. 1981. Low-input technology for managing Oxisols and Ultisols in trop- ical America. Adv. Agron. 34:279-406.
88. Sanchez, P.A., K.D. Shepherd, M.I. Soule, F.M. Place, R.I. Buresh, A.-M.N. Izac, A.U. Mokwunye, F.R. Kwesiga, C.G. Ndiritu, and P.L. Woomer. 1997. Soil fertility replenishment in Africa: An investment in natural resource capital. p. 1-46. In R.I. Buresh et al. (ed.) Replenishing soil fer- tility in Africa. SSSA Spec. Publ. 51. SSSA, Madison, WI.
89. Sanyal, S.K., and S.K. De Datta. 1991. Chemistry ofp hosphorus transformations in soil. Adv. Soil Sci. 16:1-120.
90. Scaife, M.A. 1968. The effectiveness of a cassava 'fallow' and various manurial treatments on cotton at Ukiriguru, Tanzania. East African Agric. Forest. J. 33:231-235.
91. Schultz, J.J. 1986. Sulfuric acid-based partially acidulated phosphate rock: Its production, cost, and use. IFDC-T-31. Int. Fertilizer Develop. Center, Muscle Shoals, AL.
92. Sharma, S.N., and R. Prasad. 1996. Mussoorie rock phosphate-pyrite mixture as phosphate fertilizer. Fert. Res. 45:187-191.
93. Smaling, E.M.A., S.M. Nand wa, and B.H.Ianssen. 1997. Soil fertility in Africa is at stake. p. 47-61. In R.I. Buresh et al. (ed.) Replenishing soil fertility in Africa. SSSA Spec. Publ. 51. SSSA, Madi- son, WI.
94. Sumner, M.E., and M.P.W. Farina. 1986. Phosphorus interactions with other nutrients and lime in field cropping systems. Adv. Soil Sci. 5:201-236.
95. Sumner, M.E., M.V. Fey, and A.D. Noble. 1991. Nutrient status and toxicity problems in acid soils. p. 149-182. In B. Ulrich and M.E. Sumner (ed.) Soil acidity. Springer-Verlag, Berlin, Germany.
96. Tand on, H.L.S. 1987. Phosphorus research and agricultural production in India. Fertilizer Development and Consultation Organization, New Delhi, India.
97. Tand on, H.L.S. 1992. Management of nutrient interactions in agriculture. Fertilizer Development and Consultation Organization, New Delhi, India.
98. Tian, G., R.I. Carsky, and B.T. Kang. 1998. Differential phosphorus responses ofleguminous cover crops on soils with variable history. J. Plant Nutr. 21:1641-1653.
99. Tian, G., B.T. Kang, and L. Brussaard. 1992. Biological effects of plant residues with contrasting chem- ical compositions under humid tropical conditions-Decomposition and nutrient release. Soil BioI. Biochem. 24:1051-1060.
100. Tian, G., and G.O. Kolawole. 1999. Phosphorus availability of phosphate rock incubated with plant residues with various chemical compositions. Agrofor. Forum 9(4):40-42.
101. Vanlauwe, B., J. Diels, N. Sanginga, R.I. Carsky, J. Deckers, and R. Merckx. 2000. Utilization or rock phosphate by crops on a representative toposequence in the Northern Guinea savanna zone of Nigeria: Response by maize to previous herbaceous legume cropping rock phosphate treatments. Soil BioI. Biochem. 32:2079-2090.
102. Vanlauwe, B., O.c. Nwoke, J. Diels, N. Sanginga, R.J. Carsky, J. Deckers, and R. Merckx. 2000. Uti- lization of rock phosphate by crops on a representative toposequence in the Northern Guinea savanna zone of Nigeria: Response by Mucuna pruriens, Lablab purpureus and maize. Soil BioI. Biochem. 32:2063-2077.
103. Visker, C., A. Pinto, and K. Dossa. 1995. Residual effect ofp hosphate fertilizers, with special reference to phosphate rock. p. 93-98. In H. Gerner and A.U. Mokwunye (ed.) Use of phosphate rock for sustainable agriculture in West Africa. Misc. Fertilizer Studies no. II. Int. Fertilizer Develop. Center-Africa, Lome, Togo.
104. Von Uexkull, H. and E. Mutert. 1995. Global extent, development and economic impact of acid soils. Plant Soil 171:1-15.
105. Warren, G. P. 1992. Fertilizer phosphorus. Sorption and residual value in tropical African soils. NRI Bull. 37. Natural Resources Inst., Chatham, UK.
106. Warren, G. 1998. Effects of native soil phosphorus on biodiversity, productivity, and the dynamics of soil carbon and nitrogen in semi-arid Kenya. p. 237. In Proc. 16th World Congress of Soil Sci. Vol. I: Symposium no. 12. Centre de Cooperation International de la Recherche Agronomique pour la Developpment, Montpellier, France.
107. Wendt, J.w., and R.B. Jones. 1997. Evaluation of the efficacy of Malawi Tundulu phosphate rock for maize production. Nutrient Cycl. Agroecosyst. 48: 161-170.
108. Zaharah, A.R., and A.R. Bah. 1997. Effect of green manures on P solubilization and P uptake from phos- phate rocks. Nutrient Cycl. Agroecosyst. 48:247-255.