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Effect of tiller age and time of nitrogen stress on seed production of Paspalum plicatulum

Published online by Cambridge University Press:  27 March 2009

P. A. Chadhokar  and
L. R. Humphreys
P. A. Chadhokar
Affiliation:
Department of AgricultureUniversity of QueenslandSt Lucia, 4067, Australia
L. R. Humphreys
Affiliation:
Department of AgricultureUniversity of QueenslandSt Lucia, 4067, Australia
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Summary

Paspalum plicatulum was grown at Brisbane in boxes of sand receiving basal nutrients and frequent irrigation; weekly levels of ammonium nitrate application were varied according to growth and development stage.

The rate of tiller appearance increased to a maximum 40–50 days after sowing and almost ceased thereafter. Tiller leaf number, survival, fertility, inflorescence branching, seeds per raceme and seed size were positively related to tiller age. Young tillers were more sensitive to variations in nitrogen supply than old tillers.

Adequate nitrogen nutrition during the vegetative phase from sowing to floral initiation (93 days) increased tiller and hence inflorescence density; increased inflorescence branching was compensated by fewer seeds per raceme. Good nitrogen nutrition during the phase from floral initiation to inflorescence exsertion (142 days) increased survival of late-formed tillers and hence inflorescence density; inflorescence branching, seeds per raceme and seed size were also increased. Nitrogen stress during the final maturation phase did not affect seed yield.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 81 , Issue 2 , October 1973 , pp. 219 - 229
Copyright
Copyright © Cambridge University Press 1973

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