Morphological and agronomic responses of hybrid, high yielding and traditional rice (Oryza sativa L.) varieties to age of seedling and spacing

Issue Date

4-2009

Abstract

A field experiment was conducted from May to October 2007 at the Central Experiment Station of the University of the Philippine Los Baños to examine the morphological and agronomic responses of three rice varieties to different spacing and seedling age. The split-split plot design with three replications was used with three rice varieties (PSB Rc72H, PSB Rc18, and Dinorado), three seedling ages (8, 15, and 20-day old seedling), and two spacings (20 cm x 20 cm and 40 cm x 40 cm). PSB Rc72H produced longest panicle and highest number of leaves on the main culm. PSB Rc18, produced the highest number of panicles per hill. Dinorado had the lowest values in all parameters measured. Plant height and days to maturity were significantly increased with 20-day old seedling. The shorter phyllochron, higher root pulling resistance and number of leaves on the main culm were observed for 80-day old seedlings. Most of these characters increased significantly at wider spacing. Significant responses on grain yield were observed only at closer spacing. There was no significant difference on root pulling aerenchyma cell number, size, and total aerenchyma cell area due to variety, seedling age, spacing and their interactions.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463x

Volume

34

Issue

1

Page

38-52

Document Type

Article

Frequency

tri-quarterlyt

Physical Description

tables, graphs

Language

English

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