Abstract
The use of finely ground phosphate rocks (PRs) as directly applied P fertilizers in tropical farming systems is a cheaper alternative to acidulated, water-soluble P products. However, the effectiveness of PRs in tropical environments depends on the extent to which the required P uptake rate of the crop plant can be maintained by the rate of PR dissolution in that soil. That extent that this outcome is achieved depends on the properties of the PR, the soil, climate, plant factors, and on management practice. Environmental conditions in the surface layers of highly weathered soils in the humid tropics are generally conducive of the attainment of satisfactory rates of PR dissolution, especially as the reactivity of the PR increases. In soils with very high P sorption capacities, however, the agronomic effectiveness of PRs is reduced as the acquisition of dissolved P by plant roots is restricted by competition from P sorption processes in the soil.
In determining the required reactivity of PRs for use in tropical regions one must consider the rate of P demand by the crop or pasture and the suitability of the soil environment for PR dissolution. The use of some water-soluble P in combination with the PR might enable PRs of low reactivity to also be used, where alone they would be relatively ineffective. The ability of PRs to provide Ca, in addition to P, needs further study because subsoil Ca deficiency is becoming more widely recognized as a production constraint in highly weathered tropical soils. The future use of PRs in tropical agriculture is expected to expand for plantation crops and pastures and especially for landlocked countries with local deposits of PR. Increased use of PRs will also occur where more reactive PRs can effectively be used to increase the yield of annual food crop.
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References
Apthorp JN, Hedley MJ and Tillman RW (1987) The effect of nitrogen fertiliser form on the plant availability of phosphate from soil, phosphate rock and monocalcium phosphate. Fert Res 12: 269–284
Barnes JS and Kamprath EJ (1975) Availability of North Carolina Rock Phosphate applied to soils. Tech Bull No 229. Nth Carolina Agric Expt St, Raleigh, North Carolina
Barrow NJ (1983) A mechanistic model for describing the sorption and desorption of phosphate by soil. J Soil Sci 34: 733–750
Barrow NJ (1990) Relating chemical processes to management systems. In: Phosphorus Requirements for Sustainable Agriculture in Asia and Oceania, Symposium Proceedings, pp 200–209. Int Rice Res Inst, Philippines
Bekele T, Clino BJ, Elhert PAI, Van der Mass AA and Van Deist A (1983) An evaluation of plant borne factors promoting the solubilization of alkaline rock phosphates. Plant Soil 75: 361–378
Bolan NS and Hedley MJ (1989) Dissolution of phosphate rocks in soil. 1. Evaluation of extraction methods for the measurement of phosphate rock dissolution. Fert Res 19: 65–75
Bolan NS and Hedley MJ (1991) Processes of soil acidification during nitrogen cycling with emphasis on legume based pastures. In: Wright RJ, Baligar VC and Murrmann RP (eds) Plant-soil Interactions at Low pH, pp 169–179. Kluwer Academic Publishers, Dordrecht
Bolan NS, Hedley MJ and Loganathan P (1993) Preparation, forms and properties of controlled release phosphate fertilizers. Fert Res 35: 13–24
Chew KL (1993) Phosphate fertilizer distribution and acceptance - a Malaysian experience. Proceedings of workshop on phosphate sources for acid soils in the humid tropics of Asia (IMPHOS and API) (In press)
Chien SH (1977) Thermodynamic considerations on the solubility of phosphate rock. Soil Sci 123: 117–121
Chien SH (1979) Dissolution of phosphate rocks in acid soils as influenced by nitrogen and potassium fertilizers. Soil Sci 127: 371–376
Chien SH (1993) Reactions of phosphate rocks with acid soils of the humid tropics. Proceedings of workshop on phosphate sources for acid soils in the humid tropics of Asia (IMPHOS and API) (In press)
Chien SH and Hammond LL (1978) A comparison of various laboratory methods for predicting the agronomic potential of phosphate rocks for direct application. Soil Sci Soc Am J 42: 935–939
Chien SH, Clayton WR and McClellan GH (1980) Kinetics of dissolution of phosphate rocks in soils. Soil Sci Soc Am J 44: 260–264
Chien SH, Sale PWG and Hammond LL (1990) Comparison of the effectiveness of phosphate fertiliser products. In: Phosphorus Requirements for Sustainable Agriculture in Asia and Oceania, Symposium Proceedings, pp 143–156. Int Rice Res Inst, The Philippines
Chu CR, Moschlar WW and Thomas GW (1962) Rock phosphate transformations in acid soils. Soil Sci Soc Am Proc 26: 476–478
Cook PJ, Banerjee DM and Southgate PN (1990) The phosphorus resources of Asia and Oceania. In: Phosphorus Requirements for Sustainable Agriculture in Asia and Oceania, Symposium Proceedings, pp 97–114. Int Rice Res Inst. The Philippines
Deist J, Marais PG, Harry RBA and Heyns CFG (1971) Relative availability of rock phosphate to different plant species. Agrochemophysica 3: 35–40
DeWitt CT (1967) Photosynthesis: its relationship to over-population. In: San Pietro FA, Greer FA and Army TJ (eds) Harvesting the Sun, pp 315–320. Academic Press, New York
Easterwood GW, Sartain JB and Street JJ (1989) Fertilizer effectiveness of three carbonate apatites on an acid Ultisol. Comm Soil Sci Pl Anal 20: 789–800
Edwards DG and Bell LC (1989) Acid soil infertility in Australian tropical soils. In: Craswell ET and Pushparajah E (eds) Management of Acid Soils in the Humid Tropics of Asia, pp 20–31. ACIAR, Canberra
Edwards DG, Sharifuddin HAH, Mohd Yusoff MN, Grundon NJ, Shamshuddin J and Norhayati M (1991) The management of soil acidity for sustainable crop production. In: Wright RJ, Baligar VC and Murrmann RP (eds) Plant-soil Interactions at Low pH, pp 383–396. Kluwer Academic Publishers, Dordrecht
Ellis R, Quader MA and Truog E (1955) Rock phosphate availability as influenced by soil pH. Soil Sci Soc Am Proc 19: 484–487
Fenster WE and Leon LA (1979) Utilization of phosphate rock in tropical soils of Latin America. Proceedings of Seminar on Phosphate Rock for Direct Application, Haifa, Israel, March 1978. IFDC Special Publication S-1, pp 174–209. IFDC, Muscle Shoals, Alabama
Flach EN, Quak W and Van Deist A (1987) A comparison or rock phosphate-mobilizing capacities of various crop species. Trop Agric (Trinidad) 64: 347–352
Gilbert MA, Shaw KA, Armour JD, Teitzel JK and Standley J (1990) Low effectiveness of Duchess rock phosphates on pastures in northern Queensland. Aust J Exp Agric 30: 61–71
Gillman GP and Bell LC (1978) Soil solution studies on weathered soils from tropical North Queensland. Aust J Soil Res 16: 67–77
Goedert WJ (1983) Management of the Cerrado soils of Brazil: a review. J Soil Sci 34: 405–428
Gregg PEH, Mackay AD, Tillman RW and Currie LD (1987) A summary of reactive phosphate rock research at Massey University. In: White RE and Currie LD (eds) The Use of Reactive Phosphate Rocks and their Derivatives as fertilizers, pp 115–124. Massey University, Palmerston North
Hammond LL (1979) Agronomic measurements of phosphate rock effectiveness. Proceedings of Seminar on Phosphate Rock for Direct Application, Haifa, Israel, March 1978. IFDC Special Publication S-1, pp 147–173. IFDC, Muscle Shoals, Alabama
Hammond LL, Chien SH and Easterwood GW (1986) Agronomic effectiveness of Bayovar phosphate rock in soils with induced phosphorus retention. Soil Sci Soc Am J 50: 1601–1606
Hammond LL, Chien SH and Mokwunye AU (1986) Agronomic value of unacidulated and partially acidulated phosphate rocks indigenous to the tropics. Adv Agron 40: 89–140
Harris DJ, Uehara G and Hammond (1984) In: Ricaldi V and Escalera S (eds) La Roca Fosforica, Vol II, pp 437–445. Grupo Latinoamericano de Investigadores de Roca Fosforica (GLIRF), Cochabamba, Boliva
Hedley MJ, Nye PH and White RE (1982) Plant-induced changes in the rhizosphere of rape (Brassica napus var. Emerald) seedlings II Origin of the pH change. New Phy 91: 31–44
Hedley MJ, Hussin A and Bolan NS (1990) New approaches to phosphorus fertilization. In: Phosphorus Requirements for Sustainable Agriculture in Asia and Oceania, Symposium Proceedings, pp 125–142. Int Rice Res Inst, The Philippines
Hellums DT, Chien SH and Touchton JT (1989) Potential agronomic value of calcium in some phosphate rocks from South America and West Africa. Soil Sci Soc Am J 53: 459–462
Hughes JC and Gilkes RJ (1986) The effect of rock phosphate properties on the extent of fertilizer dissolution in soils. Aust J Soil Res 24: 209–217
Hutton EM (1985)Centrosema breeding for acid tropical soils, with emphasis on efficient Ca absorption. Trop Agric (Trinidad) 62: 273–280
IFDC (1982) Circular IFDC-S-6 (Ann Rep) IFDC, Muscle Shoals, Alabama
IFDC (1991) On-farm fertilizer evaluation and adoption in Mali. Progress Report.
Kanabo JA and Gilkes RJ (1987) The role of pH in the dissolution of phosphate rock fertilizers. Fert Res 12: 165–174
Kellog CE and Orvedal AC (1969) Potentially arable soils of the world and critical measures for their use. Adv Agron 21: 109–170
Khasawneh FE and Doll EC (1978) The use of phosphate rock for direct application to soils. Adv Agron 30: 159–206
Kirk GJD and Nye PH (1986) A simple model for predicting the rate of dissolution of sparingly soluble calcium phosphate in soil 1. The basic model. J Soil Sci 37: 529–540
Kirk GJD, Yu Tian-ren and Choudhury FA (1991) Phosphorus chemistry in relation to water regime. In: Phosphorus Requirements for Sustainable Agriculture in Asia and Oceania, Symposium Proceedings, pp 211–223. Int Rice Res Inst, The Philippines
Landsberg HE (1961) Solar radiation at the earth's surface. Solar Energy 5: 95–98
Lehr JR and McClennan GH (1972) A revised laboratory reactivity scale for evaluating phosphate rocks for direct application. TVA Bulletin Y-43, 36p
Leon LA, Fenster WE and Hammond LL (1986) Agronomic potential of eleven phosphate rocks from Brazil, Columbia, Peru, and Venezuela. Soil Sci Soc Am J 50: 798–802
McClellan GH (1979) Mineralogy and reactivity of phosphate rock. Proceedings of Seminar on Phosphate Rock for Direct Application, Spec Publ IFDC-S1, pp 57–87. Int Fert Dev Cent, Muscle Shoals, Alabama
McClellan GH and Notholt AJG (1986) Phosphate deposits of tropical sub-Saharan Africa. In: Mokwunye AU and Vlek PLG (eds) Management of Nitrogen and Phosphorus Fertilizers in sub-Saharan Africa, pp 173–223. Martinus Nijhoff, Dordrecht, Netherlands
Mackay AD and Syers JK (1986) Effect of phosphate, calcium and pH on the dissolution of a phosphate rock in soil. Fert Res 10: 175–184
Mokwunye U and Hammond LL (1993) Myths and science of fertilizer use in soils of the tropics. ASA Publication (In press)
Mokwunye U, Chien SH and Rhodes E (1986) Phosphate reactions with tropical African soils. In: Mokwunye AU and Vlek PLG (eds) Management of Nitrogen and Phosphorus Fertilizers in sub-Saharan Africa, pp 253–281. Martinus Nijhoff, Dordrecht, Netherlands
Palmer B and Jessop RS (1982) The relative value of water soluble and ammonium-citrate soluble phosphorus for wheat production. J Agric Sci Camb 98: 467–470
Pushparajah E, Chan F and Magat SS (1990) Phosphorus requirements and management of oil palm, coconut, and rubber. In: Phosphorus Requirements for Sustainable Agriculture in Asia and Oceania, Symposium Proceedings, pp 399–408. Int Rice Res Inst, The Philippines
Rajan SSS and Marwaha BC (1993) Use of partially acidulated phosphate rocks as phosphate fertilizers 35: 47-59 (This issue)
Ritchey KD, Souza DMG, Lobato E and Correa O (1980) Calcium leaching to increase rooting depth in a Brazilian savannah Oxisol. Agron J 72: 40–44
Rogers HT, Pearson RW and Ensminger LE (1953) Soil and Fertilizer Phosphorus in Plant Nutrition. Academic Press, New York
Sale PWG (1990) The agronomic efficiency, the economics and the quality of directly applied ground rock phosphate and partially acidulated phosphate rock. Proceedings of IFA/IMPHOS seminar on Role of Phosphates in Balanced Fertilization, Vol 1, pp 186–202. IFA, Paris
Sanchez PA (1976) Properties and Management of Soils in the Tropics. John Wiley, New York
Sanchez PA and Salinas JG (1981) Low-input technology for managing Oxisols and Ultisols in tropical America. Adv Agron 34: 279–406
Smyth TJ and Sanchez PA (1982) Phosphate rock dissolution and availability in Cerrado soils as affected by phosphorus sorption capacity. Soil Sci Soc Am J 46: 339–345
Syers JK and Mackay AD (1986) Reactions of Sechura phosphate rock and single superphosphte in soil. Soil Sci Soc Am J 50: 480–485
von Uexkull HR, Woo YC and Sri Adiningsih (1992) Use of phosphate for land reclamation for agriculture use. Proceedings of workshop on phosphate sources for acid soils in the humid tropics of Asia (IMPHOS and API) (In press)
Waidyanatha UPS, Yogaratnam N and Ariyatne WA (1979) Mycorrhizal infection on growth and nitrogen fixation ofPueraria andStylosanthes and uptake of phosphorus from two rock phosphates. New Phytol 82: 147–152
Wiersum IK (1979) Calcium content of the phloem sap in relation to the Ca status of the plant. Acta Bot Neerl 28: 221–224
Wright RJ, Baligar BC, Belesky DP and Snuffer JD (1991) The effect of phosphate rock dissolution on soil chemical properties and wheat seedling root elongation. In: Wright RJ, Baligar VC and Murrmann RP (eds) Plant-soil Interactions at Low pH, pp 281–290. Kluwer Academic Publications, The Netherlands
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Sale, P.W.G., Mokwunye, A.U. Use of phosphate rocks in the tropics. Fertilizer Research 35, 33–45 (1993). https://doi.org/10.1007/BF00750218
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DOI: https://doi.org/10.1007/BF00750218