A field experiment was conducted during 1995 96 at New Delhi, to study the efficiency of modified forms of urea materials, viz. prilled urea (PU), neern cake coated urea (NCU), 0.5% of 10% neem oil emulsion coated urea and 0.5% of 20% neem oil emulsion coated urea at varying N rates (0, 60 and 120 kglha) on the productivity of lowland transplanted rice (Oryza sativa L.). Each incremental N level recorded significantly higher growth parameters, yield attributes, grain and straw yields and also N uptake over its preceding level. However, apparent N recgvery decreased with increasing N levels. Neem cake coated urea and neem oil emulsion coated urea irrespective of the concentration improved rice growth, yield attributes and resulted in more grain and straw yields, N uptake and also higher apparent N recovery than did commercial prilled urea.
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Shivay et al. (2001) studied this question.