• Rex Immanuel, R
• M. Thirupathi
• M. Saravanaperumal
• G. Murugan
• G.B. Sudhagar Rao

Field experiments were undertaken at Experimental Farm, Department of Agronomy, Annamalai University, Annamalai Nagar during Thaladi (Sep. to Jan.) and Navarai seasons (Jan. to Apr.) to findout the impact of crop geometry and green leaf manuring in combination with chemical fertilizers on uptake of N, P and K, nitrogen use efficiency (NUE) and economic nitrogen use efficiency (ENUE) of rice in lowland ecosystem. Different treatments consisting of crop geometry and combined application of green manuring with chemical fertilizers significantly influenced the nutrient uptake, NUE and ENUE compared with control. Among the treatments tested, the crop raised by adopting 30  30 cm spacing along with integrated application of 50 per cent N via., Albizia lebbeck and remaining with 50 per cent N via., urea recorded the highest N, P and K uptake, NUE of 26.98 kg ha-1 and ENUE of 4.51 ha-1 for Thaladi season. Where as in Navarai season, rice planted by adopting 25  25 cm spacing along with integrated application of 50 per cent N via., Albizia lebbeck and remaining 50 per cent N via., inorganic fertilizer gave maximum N, P and K uptake, NUE (29.72 kg ha-1) and ENUE ( 4.97 ha-1).

direct sown rice, green leaf manuring, integrated nutrient management, nitrogen use efficiency

"IMPACT OF CROP GEOMETRY AND INTEGRATED NUTRIENT MANAGEMENT ON NPK UPTAKE AND NITROGEN USE EFFICIENCY OF RICE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 4, page no.598-602, April-2019, Available :http://www.jetir.org/papers/JETIR1904487.pdf

"IMPACT OF CROP GEOMETRY AND INTEGRATED NUTRIENT MANAGEMENT ON NPK UPTAKE AND NITROGEN USE EFFICIENCY OF RICE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 4, page no. pp598-602, April-2019, Available at : http://www.jetir.org/papers/JETIR1904487.pdf