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Undersowing Rice (Oryza sativa) with Stylosanthes guyanensis. III. Nitrogen Supply

Published online by Cambridge University Press:  03 October 2008

H. M. Shelton  and
L. R. Humphreys
H. M. Shelton
Affiliation:
Australian Development Assistance Agency, Khon Kaen University, Khon Kaen, Thailand
L. R. Humphreys
Affiliation:
Department of Agriculture, University of Queensland, St. Lucia, Australia
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Summary

The growth and nitrogen yield of Stylosanthes guyanensis undersown with upland rice were negatively related to level of urea application at Khon Kaen, north-east Thailand. In the absence of applied urea the nitrogen yield of rice monoculture was 3·3 gm./m.2 whilst the addition of stylo increased nitrogen yield of the association to 9·6 gm./m.2 Stylo was initially dominated by rice but exploited environmental growth factors more effectively in the latter part of the growing season, accentuating competition for water and phosphorus. Simultaneous stylo and rice sowing reduced rice grain yield by 12 per cent, the greatest reduction occurring at a low level of urea application, mainly due to abortion of spikelets after panicle exsertion.

Type
Research Article
Information
Experimental Agriculture , Volume 11 , Issue 2 , April 1975 , pp. 103 - 111
Copyright
Copyright © Cambridge University Press 1975

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References

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