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Sources of nitrogen and methods of application for flooded rice: I. Comparison of two methods of applying slow release and standard fertilizer materials*

Published online by Cambridge University Press:  27 March 2009

G. V. Simsiman ,
S. K. De Datta  and
J. C. Moomaw
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Extract

Field experiments with rice were conducted on a flooded soil comparing two standard fertilizers with N fertilizers with various release rates. For each of these fertilizer materials two methods of application were compared: broadcast and incorporated, and placement at 15 cm depth. The .slow release materials resulted in a lower grain yield than did fast or medium release rate or standard fertilizer materials. They released N too slowly during the early growth of rice to permit optimum plant growth and development.

Placement of 80 kg/ha N at 15 cm depth increased the plant N content at all stages of growth and significantly increased the grain yield compared with the broadcast-and-incorporated fertilizer treatment. The highest grain yield in the experiment (7701 kg/ha rough rice) was obtained from a medium release material, which was 88 % more efficient in increasing grain yield per unit of N when placed at 15 cm than when broadcast-and-incorporated.

The recovery of fertilizer N was 68% when deeply placed and 38 % when broadcast-andincorporated.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 69 , Issue 2 , October 1967 , pp. 189 - 196
Copyright
Copyright © Cambridge University Press 1967

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