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Efficiency of urea-based fertilizers for wetland rice (Oryza sativa)

Published online by Cambridge University Press:  27 March 2009

P. Mahapatra ,
D. Panda  and
S. K. Mohanty
P. Mahapatra
Affiliation:
Central Rice Research Institute, Cuttack-753006, Orissa, India
D. Panda
Affiliation:
Central Rice Research Institute, Cuttack-753006, Orissa, India
S. K. Mohanty
Affiliation:
Central Rice Research Institute, Cuttack-753006, Orissa, India
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Summary

Field experiments were conducted in two wet and two dry seasons in 1984–86 to evaluate efficiencies of different urea-based fertilizers, and methods of application, for irrigated rice. Response to applied N was significant in all seasons. In the wet season, use of dhaincha (Sesbania aculeata) green manure and urea (Dh + U), reduced zone placement of urea supergranules (USG), surface application of laccoated urea (LCU) and prilled urea in three split doses (PU-split) gave similar results, and all were better than basal broadcast application of urea coated with neem (Azadirachta indica) cake (NCU) or prilled urea (PU-basal). In the dry season, USG was significantly superior to PU-basal, NCU and (Dh + U). Nitrogen uptake by rice was greatest 15–30 days after transplanting (DAT), followed by a second peak during the reproductive phase of the crop. Ammonium-N in the soil decreased sharply up to 30 DAT, more slowly up to 60 DAT and then increased slightly. Ammonium-N in the soil was higher with USG, (Dh + U) and PU split than with other treatments, especially in uncropped conditions.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 114 , Issue 2 , April 1990 , pp. 187 - 191
Copyright
Copyright © Cambridge University Press 1990

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