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Rock Phosphates in Agriculture

Published online by Cambridge University Press:  03 October 2008

P. H. Le Mare
P. H. Le Mare
Affiliation:
Greenfield House, Allithwaite, Grange-over-Sands, Cumbria, LA11 7RG, England
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Summary

The principles that control effectiveness of rock phosphates as fertilizer are now fairly well understood so that the potential effect of a material can be predicted with some confidence from laboratory analysis of the raw material. Soil characteristics, especially acidity, and calcium and phosphate status, are important: if these are not conducive to dissolution, crop response to rock phosphate is small. Some crop characteristics, especially the extent of root systems and whether they are infected with mycorrhizae, also affect utilization of rock phosphate. Dissolution of rock phosphates may be too slow for rapidly growing crops but may be adequate for perennial crops.

Such factors limit the use of rock phosphates for direct application, so that much greater knowledge of the characteristics of the phosphates, soils and crops, and their interactions, is necessary for their successful use than for the soluble phosphates. Economic considerations are important also. Because the phosphate content is less than that of concentrated soluble fertilizers, the cost of transporting rock phosphates, per unit of phosphorus, may not be economic. However, for acid and calcium deficient soils the larger amounts of calcium that rock phosphates supply may be an advantage and may lessen or eliminate the need for lime, especially for crops that require relatively large amounts of calcium.

Fosfatos de roca en la agricultura

Type
Research Article
Information
Experimental Agriculture , Volume 27 , Issue 4 , October 1991 , pp. 413 - 422
Copyright
Copyright © Cambridge University Press 1991

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References

REFERENCES

Bangar, K. C., Yadav, K. S. & Mishra, M. M. (1985). Transformation of rock phosphate during composting and the effect of humic acid. Plant and Soil 85:259–266.CrossRefGoogle Scholar
Bangar, K. C., Shanker, S., Kampoor, K. K., Kamlesh, Kukreja & Mishra, M. M. (1989). Preparation of nitrogen and phosphorus-enriched paddy straw compost and its effect on yield and nutrient uptake by wheat(Triticum aestivum L.). Biology and Fertility of Soils 8:339–342.CrossRefGoogle Scholar
Cabala-Rosand, P. & Wild, A. (1982a). Direct use of low grade phosphate rock from Brazilas fertilizer. I. Effect of reaction time in soil. Plant and Soil 65:351–362.CrossRefGoogle Scholar
Cabala-Rosand, P. & Wild, A. (1982b). Direct use of low grade phosphate rock from Brazilas fertilizer. II. Effects of mycorrhizal inoculation and nitrogen source. Plant and Soil 65:363–373.CrossRefGoogle Scholar
Chang, S. C. & Jackson, M. L. (1957). Fractionation of phosphorus. Soil Science 84:133–144.CrossRefGoogle Scholar
Chien, S. H. & Hammond, L. L. (1978). A comparison of various laboratory methods for predicting agronomic potential of phosphate rocks for direct application. Soil Science Society of America Journal 42:935–939.CrossRefGoogle Scholar
Chien, S. H. & Hammond, L. L. (1988). Agronomic evaluation of partially acidulated phosphate rocks in the tropics –IFDC's experience. IFDC Paper Series, P-7. Muscle Shoals, Alabama 35662, USA: International Fertilizer Development Center.Google Scholar
Chien, S. H. & McClellan, G. H. (1979). Variation of the apatite composition in phosphate rock and its relationship to rock's chemical reactivity and agronomic effectiveness. Proceedings of Conference on Classification and Management of Tropical Soils,Kuala Lumpur, Malaysia,15–20 August 1977, 377–384.Google Scholar
Chien, S. H., Sale, P. W. G. & Hammond, L. L. (1989). Comparison of effectiveness of various phosphatic fertilizer products. In International Symposium on Phosphorus Requirements for Sustainable Agriculture in Asia and Oceania, 6–10 March 1989. Los Baños, Philippines:International Rice Research Institute.Google Scholar
Cooke, G. W. (1956). The value of rock phosphates for direct application. Empire Journal of Experimental Agriculture 24:295–306.Google Scholar
Cooke, G. W. (1982). Phosphate fertilizers. In Fertilizing for Maximum Yield. London: Granada Publishing.Google Scholar
Hammond, L. L., Chien, S. H. & Mokwunye, A.U. (1986). Agronomic value of unacidulated and partially acidulated phosphate rocks indigenous to the tropics. Advances in Agronomy 40:89–140.CrossRefGoogle Scholar
Harris, D. J., Briones, A., Hammond, L. L. et al. (1985). Comparison of phosphate rock sources in two benchmark soils. In Soil-based Agrotechnology Transfer (Ed. Silva, James A.). Benchmark Soils Project, Department of Agronomy and Soil Science, University of Hawaii.Google Scholar
Hughes, J. C. & Gilkes, R.J. (1984). The effect of chemical extractant on the estimation of rock phosphate fertilizer dissolution. Australian Journal of Soil Research 22:475–481.CrossRefGoogle Scholar
IFDC (1990). Phosphate research. In Annual Report 1989, 50–51. Muscle Shoals, Alabama 35662, USA: International Fertilizer Development Center.Google Scholar
Khasawneh, F. E. & Doll, E. C. (1978). The use of phosphate rock for direct application to soils. Advances in Agronomy 30:159–206.CrossRefGoogle Scholar
Lehr, J. R. (1980). Phosphate raw materials: Part I–A look ahead. In The Role of Phosphorus in Agriculture. Madison, Wisconsin, USA: American Society of Agronomy.Google Scholar
Le Mare, P. H. (1986). Direct application of rock phosphates in agriculture. Workshop onthe Use of Rock Phosphates in Agriculture, Zomba, Malawi, June 1986: Commonwealth Science Foundation, London, and International Development Research Centre, Toronto.Google Scholar
McClellan, G. H. & Gremillion, L. R. (1980). Evaluation of phosphatic raw materials. In The Role of Phosphorus in Agriculture. Madison, Wisconsin, USA: American Society of Agronomy.Google Scholar
Sanders, F. E. (1981). Microbiological factors. Chap. 9. Section B, In Characterization of Soils in Relation to their Classification and Management for Crop Production: Examples from Some Areas of the Humid Tropics (Ed. Greenland, D. J.). Oxford: Clarendon Press.Google Scholar