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Response of Mediterranean grassland to phosphate and stocking rates: biomass production and botanical composition

Published online by Cambridge University Press:  27 March 2009

A. E. Osman ,
P. S. Cocks ,
L. Russi  and
M. A. Pagnotta
A. E. Osman
Affiliation:
International Center for Agricultural Research in the Dry Areas (ICARDA), PO Box 5466, Aleppo, Syria
P. S. Cocks
Affiliation:
International Center for Agricultural Research in the Dry Areas (ICARDA), PO Box 5466, Aleppo, Syria
L. Russi
Affiliation:
International Center for Agricultural Research in the Dry Areas (ICARDA), PO Box 5466, Aleppo, Syria
M. A. Pagnotta
Affiliation:
International Center for Agricultural Research in the Dry Areas (ICARDA), PO Box 5466, Aleppo, Syria
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Summary

Three rates of phosphate (0, 25, and 60 kg/ha P2O5) were applied to phosphorus-deficient native grassland at Tel Hadya, in northern Syria, and biomass productivity, botanical composition and number of legume seeds in the soil were monitored for five seasons (1984/85–1988/89). The experiment was grazed at low (0·8 sheep/ha per year) and high (1·7 sheep/ha per year) stocking rates from the second to the fourth seasons of the experiment; in the fifth season, the low and high stocking rates were increased to 1·1 and 2·3 sheep/ha per year, respectively. The experimental site was typical of native grassland within the cereal zone of west Asia, where cropping is not possible because of shallow, stony soils and steep slopes.

The results showed that annual applications of phosphorus, even as low as 25 kg P2O5/ha, alleviated the deficiency in soil P and resulted in improved pasture production, even in dry years. Legume production showed the greatest response to P, increasing by 0·3–3 times the production of the control treatments. By the fifth season, legume seed mass had increased threefold and number of seeds sixfold in the P-treated plots, compared with the first season, while in the control plots there was little change. Rain-use efficiency on the P-treated plots was more than double that of the controls by the fourth and fifth seasons.

Practical application of the results depends on whether (i) legumes are as frequent in native grasslands, as a whole, as they are at Tel Hadya, (ii) the P deficiency observed at Tel Hadya is widespread, and (iii) grazing of communally owned grasslands can be controlled. It is suggested that all three criteria will often be fulfilled and, therefore, that grassland productivity in west Asia could be substantially increased. Furthermore, the results suggest that above-ground cover and soil organic matter will also increase after P application, both of which will help to reduce soil erosion and thereby increase the sustainability of livestock production in west Asia.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 116 , Issue 1 , February 1991 , pp. 37 - 46
Copyright
Copyright © Cambridge University Press 1991

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References

REFERENCES

Andrew, C. S. (1962). In Annual report, Division of Tropical Pastures, Commonwealth Scientific and Industrial Organization, pp. 26–27. Melbourne: CSIRO.Google Scholar
Asher, C. J. & Loneragan, J. F. (1967). Response of plants to phosphate concentration in solution culture. I. Growth and phosphate content. Soil Science 103, 225–233.CrossRefGoogle Scholar
Bounejmate, D. M., Lahlou, A. & Beale, P. E. (1989). Ecogeographic survey of wild legumes in Morocco. Annual report, Pasture Forage and Livestock Program, pp. 97–99. Aleppo: ICARDA.Google Scholar
Cocks, P. S. & Ehrman, T. A. M. (1987). The geographic origin of frost tolerance in Syrian pasture legumes. Journal of Applied Ecology 24, 678–683.CrossRefGoogle Scholar
Cocks, P. S. & Thomson, E. F. (1988). Increasing feed resources for small ruminants in the Mediterranean basin. In Increasing Small Ruminant Productivity in Semi-Arid Areas (Ed. Thompson, E. F. & Thomson, F. S.), pp. 51–66. Dordrecht: Kluwer.CrossRefGoogle Scholar
Cooper, P. J. M., Gregory, P. J., Tully, D. & Harris, H. C. (1987). Improving water use efficiency of annual crops in the rainfed farming systems of West Asia and North Africa. Experimental Agriculture 23, 113–158.CrossRefGoogle Scholar
Crespo, D. G. (1985). Importance of grazing trials in determining the potential of rainfed Mediterranean pastures. Bulletin, FAO-European Co-operative Network on Pasture and Fodder Crop Production No. 4, 85–92. Rome: FAO.Google Scholar
Dennett, M. G., Rodgers, J. A. & Keatinge, J. D. H. (1983). Simulation of a rainfall record for the site of new agricultural development: an example from northern Syria. Agricultural Meteorology 29, 247–258.CrossRefGoogle Scholar
Donald, C. M. (1970). Temperature pasture species. In Australian Grasslands (Ed. Moore, R. M.), pp. 303–320. Canberra: ANU Press.Google Scholar
Greenland, D. J. (1971). Changes in the nitrogen status and physical condition of soils under pastures, with special reference to the maintenance of the fertility of Australian soils used for growing wheat. Soils and Fertilizers 34, 237–251.Google Scholar
Jones, M. B., Lawler, P. W. & Ruckman, J. E. (1970). Differences in annual clover responses to phosphorus and sulphur. Agronomy Journal 62, 439–442.CrossRefGoogle Scholar
Le Houerou, H. N. & Hoste, C. H. (1977). Rangeland production and annual rainfall relations in the Mediterranean basin and in the African Sahelo-Sudanian zone. Journal of Range Management 30, 181–189.CrossRefGoogle Scholar
Lewis, N. N. (1987). Nomads and Settlers in Syria and Jordan. Cambridge: Cambridge University Press.Google Scholar
McKell, C. M., Wilson, A. W. & Williams, W. A. (1962). Effect of temperature on phosphorus utilization by native and introduced legumes. Agronomy Journal 54, 109–113.CrossRefGoogle Scholar
Murphy, A. H., Jones, M. B., Clawson, J. W. & Street, J. E. (1973). Management of clovers on California annual grasslands. Circular, California Agricultural Extension Service No. 564.Google Scholar
Nordblom, T. L. & Thomson, E. F. (1987). A Whole Farm Model Based on Experimental Flocks and Crop Rotations in North West Syria. ICARDA-102 En. Aleppo: ICARDA.Google Scholar
Osman, A., Raguse, C. A. & Sumner, D. C. (1977). Growth of subterranean clover in a range soil as affected by microclimate and phosphorus availability. II. Laboratory and phytotron studies. Agronomy Journal 69, 26–29.CrossRefGoogle Scholar
Puckridge, D. W. & French, R. J. (1983). The legume pasture in cereal-ley farming systems of southern Australia: a review. Agriculture, Ecosystems and Environment 9, 229–267.CrossRefGoogle Scholar
Rossiter, R. C. (1966). Ecology of the Mediterranean annual-type pasture. Advances in Agronomy 18, 1–56.CrossRefGoogle Scholar
Russell, J. S. (1960). Soil fertility changes in the long-term experimental plots at Kybybolite, South Australia. I. Changes in pH, total nitrogen, organic carbon and bulk density. Australian Journal of Agricultural Research 11, 902–926.CrossRefGoogle Scholar
Turk, M. A. (1988). The growth of annual legume species in marginal rangelands in Syria with special reference to response to phosphorus. PhD thesis, University of Sheffield.Google Scholar
Veronesi, F. (1987). Prospectives for increasing productivity of pastures in central and south Italy. Workshop on Pasture Improvement, Madrid, Spain 22–24 April 1987 pp., 193–194. Eur 11170 En. Brussels: Commission of the European Communities.Google Scholar
Vlek, P. L. G., Fillery, I. R. P. & Burford, J. R. (1981). Accession, transformation and loss of nitrogen in soils of the arid region. Plant and Soil 58, 133–176.CrossRefGoogle Scholar
Walkley, A. & Black, I. A. (1934). An examination of the Degtjareff method for determining soil organic matter and proposed modification of the chromic acid titration method. Soil Science 37, 29–38.CrossRefGoogle Scholar
Watanabe, F. P. & Olsen, S. R. (1965). The ascorbic acid method for determining P in water and NaHCO3 extract from soil. Soil Science Society of America. Proceedings 29, 629–678.CrossRefGoogle Scholar
Williams, A. W., Love, R. M. & Conrad, J. P. (1956). Range improvement in California by seeding annual clovers, fertilization and grazing management. Journal of Range Management 9, 28–33.CrossRefGoogle Scholar