Effect of nitrogen levels and coated urea on growth, yields and nitrogen use efficiency in aromatic rice

Results from a field experiment conducted at the Indian Agricultural Research Institute, New Delhi, India showed that coating urea with elemental sulfur or gypsum or phosphogypsum gave higher yields (12.08, 6.78 and 6.14% higher grain yield compared to prilled urea) of high yielding an aromatic rice cultivar Pusa Sugandh 5' (Pusa 2511) and increased the efficiency of prilled urea. As regards nitrogen use efficiency sulfur coated urea was nearly twice as effective as gypsum or phosphogypsum coated urea; the latter two were equally effective compared to prilled urea alone.