Fate of nitrogen-tagged urea applied to wheat in the arid Mediterranean region.
1988
Abdelmonem M.A.S. | Harmsen K. | Lindsay W.L. | Vlek P.G.
This study was conducted to determine the agronomic efficiency of urea fertilizer in supplying the N requirements of dryland wheat and to make up a mass balance for the nitrogen fertilizer under the Mediterranean environment. Field experiments were conducted with 15N-labeled fertilizer in northwest Syria. In the first year (1984), at Tel Hadya, Syria, seasonal rainfall was 232 mm, and the nitrogen uptake, residual nitrogen, and nitrogen losses were 20%, 69%, and 11%, respectively. In the second season (1985) at Tel Hadya and Breda, Syria, rainfall was 373 mm and 268 mm, respectively, and the corresponding values for nitrogen uptake, residual nitrogen, and nitrogen losses were 49%, 33%, and 18% (Tel Hadya) and 29%, 53%, and 18% (Breda). These findings suggest that, despite the calcareous nature of the soils, the risk of nitrogen losses is small because of the high clay content and high cation exchange capacity (CEC) of the soils.
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