Abstract
This investigation was aimed at finding the facts and efficiencies of split application of N at different phenological phases of the rice crop. Physiological and plant factors contributing to efficiency of N utilization were also examined. Field experiments were conducted from 1992 to 1994 at Tamil Nadu Agricultural University, Coimbatore, India. N-uptake was highest between active tillering and panicle initiation. Proper apportioning of N between active tillering and panicle initiation enhance recovery of applied fertilizer N. The foliar N content and N-uptake increased by application of N at active tillering and panicle initiation, rather than by application of higher amounts of N at planting. Withholding N at active tillering or panicle initiation reduced grain yield through reduced spikelet formation. Increased foliar N content improved photosynthetic efficiency through higher amounts of chlorophyll and RuBP carboxylase, resulting in increased canopy photosynthesis. The highest grain yield was achieved by application of 85% to 100% of the total N applied of 120 kg ha−1 between active tillering and panicle initiation.
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Vijayalakshmi, C., Nagarajan, M. (1997). Influence of split application of nitrogen on foliar N content, photosynthesis, dry matter production and yield in short- and medium-duration rice cultivars. In: Kropff, M.J., et al. Applications of Systems Approaches at the Field Level. Systems Approaches for Sustainable Agricultural Development, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0754-1_20
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DOI: https://doi.org/10.1007/978-94-017-0754-1_20
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