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Factors affecting yield and fertilizer response of sugar beet in Iran
Published online by Cambridge University Press: 27 March 2009
Summary
Field experiments were conducted in four provinces of Iran in which sugar-beet yield responses to added nitrogen and phosphorus fertilizers were correlated with soil test values and number of irrigations.
Although significant yield responses to fertilizer application were obtained in all four provinces, extremely few significant relationships were established between soil test values and yield response.
Average crop yield was favourably influenced by the number of irrigations applied in Fare and Khorasan, by organic carbon status in Esfahan and Khorasan and adversely affected by increased soil conductivity in Esfahan and Khorasan. These results were taken to imply an inadequate number of irrigations in Fars and Khorasan. The high calcium carbonate status found in Fars soil adversely affected the level of average yield.
Response to nitrogen fertilizer declined in Fars and Khorasan as the leaf nitrogen exceeded 3·15 and 4·0% respectively. Response to phosphate fertilizer declined in West Azerbaijan and Khorasan when leaf phosphorus exceeded 0·4%.
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- Research Article
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- Copyright © Cambridge University Press 1973
References
Bollb-Jones, E. W., Rezania, M., Sastei, F., Hoobakht, A. & Abraham, T. P. (1971). Relationship of soil and leaf data to yield response of sugar beet in Iran. Proc. int. Symp. Soil Fert. Evaln, New Delhi 1, 199.Google Scholar
Kanwar, J. S. (1971). Soil Testing Service in India, retrospect and prospect. Proc. int. Symp. Soil Fert. Evaln, New Delhi 1, 1102.Google Scholar