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Effect of nitrogen fertilization on rice spikelet differentiation and survival

Published online by Cambridge University Press:  27 March 2009

N. Senanayake ,
R. E. L. Naylor  and
S. K. De Datta
N. Senanayake
Affiliation:
Department of Agriculture, University of Aberdeen, 581 King Street, Aberdeen AB24 5UA, Scotland, UK
R. E. L. Naylor
Affiliation:
Department of Agriculture, University of Aberdeen, 581 King Street, Aberdeen AB24 5UA, Scotland, UK
S. K. De Datta
Affiliation:
Office of International Research and Development, College of Agriculture and Life Sciences, VirginiaPolytechnic Institute and State University, Blacksburn, Virginia 24061-0334, USA
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Summary

Experiments were conducted in glasshouses at the Agronomy Department, International Rice Research Institute (IRRI), Philippines, in 1987 and 1988 to test the effects of small amounts of additional N applied at different times during the vegetative and reproductive phases of growth on rice yield components and on spikelet differentiation and survival.

The results showed that an additional 10 kg/ha of N fertilizer had the largest effect on maximum spikelet number when applied at growth stage (GS) 1·9 but was too low to sustain the survival of the differentiated spikelets. Applications after panicle initiation did not lead to an increased survival of spikelets. Foliar N application at GS 5·5 did increase spikelet survival.

The results confirm the role of limited N supply in restricting yields of rice. Altering the timing of N inputs seems unlikely to improve spikelet survival.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 127 , Issue 3 , November 1996 , pp. 303 - 309
Copyright
Copyright © Cambridge University Press 1996

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