Allometric response modular dynamics and self-thinning in rice (Oryza sativa L. varieties MR84 and MR127)

Baki B.B., . Allometric response modular dynamics and self-thinning in rice (Oryza sativa L. varieties MR84 and MR127). pp. 83-86. ISSN 1394-1712

Pot experiments were established at MARDI Research Station Bertam Seberang Prai Malaysia for three consecutive commencing on March 1992 through October 1993 to assess the allometric response and modular dynamics of rice varieties MR84 and MR127 at different density regimes. The number and growth rates of surviving genets the rates of natality and mortality of ramets of both varieties were very much density dependent. Ramet productions follow a sigmodal pattern reaching the asymptote 6-7 weeks after sowing producing 0-1.2 and 28-30 ramets / genets at the respective sowing densities of 10 and 10 000 seeds / square metre. Ramet mortality set in at week 5 or 6 reducing ramet populations of MR84 or MR127 by ca. 17 and 39.5 at the respective sowing densities of 10 and 10 000 seeds / square metre. Density dependent self-thinning set in among genet and ramet populations leaving the survivors approaching and gradually progressing along trajectories with the respective slopes of -3/2 and -1 for the varieties MR84 and MR127 in line with the law of self-thinning. The allometric allocations of dry matter components of leaf stem and panicle of both varieties were fairly constant irrespective of the sowing densities signifying that the law of constant final yields or Kira's law prevailed in these rice varieties.

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Abstract

Pot experiments were established at MARDI Research Station Bertam Seberang Prai Malaysia for three consecutive commencing on March 1992 through October 1993 to assess the allometric response and modular dynamics of rice varieties MR84 and MR127 at different density regimes. The number and growth rates of surviving genets the rates of natality and mortality of ramets of both varieties were very much density dependent. Ramet productions follow a sigmodal pattern reaching the asymptote 6-7 weeks after sowing producing 0-1.2 and 28-30 ramets / genets at the respective sowing densities of 10 and 10 000 seeds / square metre. Ramet mortality set in at week 5 or 6 reducing ramet populations of MR84 or MR127 by ca. 17 and 39.5 at the respective sowing densities of 10 and 10 000 seeds / square metre. Density dependent self-thinning set in among genet and ramet populations leaving the survivors approaching and gradually progressing along trajectories with the respective slopes of -3/2 and -1 for the varieties MR84 and MR127 in line with the law of self-thinning. The allometric allocations of dry matter components of leaf stem and panicle of both varieties were fairly constant irrespective of the sowing densities signifying that the law of constant final yields or Kira's law prevailed in these rice varieties.

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Item Type:	Article
Additional Information:	Summaries (En Ms)
AGROVOC Term:	ORYZA SATIVA
AGROVOC Term:	ORYZA
AGROVOC Term:	CRECIMIENTO
AGROVOC Term:	MEDICION
AGROVOC Term:	ACLAREO
AGROVOC Term:	RENDIMIENTO DE CULTIVOS
AGROVOC Term:	MALASIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:52
URI:	http://webagris.upm.edu.my/id/eprint/17401

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