New Zealand Journal of Agricultural Research abstracts
Determination of tiller and root appearance in perennial ryegrass (Lolium
perenne ) swards by observation of the tiller axis, and potential
application in mechanistic modelling
C. MATTHEW
J. Z. YANG*
Department of Plant Science
Massey University
Private Bag 11-222
Palmerston North, New Zealand
J. F. POTTER
New Zealand Institute for Crop & Food Research Limited
Private Bag 4005
Levin, New Zealand
*Present address: Department of Agronomy, Shanxi Agricultural University,
Taigu, Shanxi, People's Republic of China.
Abstract Recording of bud status at successive phytomers on
the tiller axis in perennial ryegrass was shown to provide information similar
to that obtained from conventional recording of tiller appearance by monitoring
marked tillers. The technique can be extended to monitor the number of roots
formed. These observations lead to the establishment of a notation which
describes tiller and root appearance, respectively, on the basis of probability
or frequency per phytomer. These statistics are analogous to but less ambiguous
in their interpretation than site filling statistics currently used to define
tiller, and sometimes root, appearance. Potential modelling applications of
quantifying sward dynamics at the phytomer level are discussed. In particular,
nodal frequency statistics allow development of mass flow equations to describe
leaf, tiller, and root production, and seasonal variation in allocation of
photosynthate to developing tillers and roots.
Keywords mass flow; nodal probability; nodal frequency;
perennial ryegrass; root appearance; site filling; phytomer; tiller
appearance
New Zealand Journal of Agricultural Research, 1998, Vol. 41: 1-10
0028-8233/98/4101-0001 $7.00/0 (c) The Royal Society of New Zealand
1998
PDF file of entire paper: medium quality (1588K); (scanned from paper original: notes about this process)
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