Abstract
The efficiency of use of a split-application of nitrogen fertilizer was measured in wheat plots at ICARDA, northern Syria. Nitrogen (60 kg N ha−1) was applied as a split-dressing; 30 kg N ha−1 at sowing (November/December) and 30 kg N ha−1 at tillering (March). Urea was used in 1991/92 and ammonium sulphate in 1992/93. Fertilizer applications were (i) 15N-labelled at both sowing and tillering, (ii) 15N-labelled fertilizer at sowing, unlabelled fertilizer at tillering, (iii) unlabelled fertilizer at sowing, 15N-labelled fertilizer at tillering.
Dry matter production and total nitrogen content of the above-ground plant material were unaffected by the time of 15N-label application. The mean amounts of nitrogen recovered in the grain were 61.5 kg N ha−1 in 1992 and 69.9 kg N ha−1 in 1993. Fertilizer nitrogen recovered by the wheat averaged 11.3% after ammonium sulphate and 17.2% after urea, with greater recoveries from an autumn application in both cases. Generally less than 10% of the nitrogen in the plant at harvest was derived from the 15N-labelled fertilizer. Mineralization of soil nitrogen provided on average 82.9 kg N ha−1 (1992) and 93.3 kg N ha−1 (1993) to the wheat.
Under these conditions N fertilizer made only a small contribution to current production, most of the plant nitrogen was derived from soil. Fertilizer use efficiency was maximized by application at sowing.
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© 1996 Springer Science+Business Media Dordrecht
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Pilbeam, C.J., McNeill, A.M., Court, D., Harris, H.C., Swift, R.S. (1996). Efficiency of fertilizer use by a rain-fed wheat crop following split-application of fertilizer nitrogen. In: Van Cleemput, O., Hofman, G., Vermoesen, A. (eds) Progress in Nitrogen Cycling Studies. Developments in Plant and Soil Sciences, vol 68. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5450-5_42
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DOI: https://doi.org/10.1007/978-94-011-5450-5_42
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