Effect of Age of Seedlings on the Yield and Agronomic Characters of Rice Varieties Differing in Maturity Periods

Date

3-1979

Degree

Bachelor of Science in Agriculture

Major Course

Major in Agronomy

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Nestor R. Lawas

Abstract

An experiment was conducted to study individual and combined effects of rice varieties varying in maturity (IR-36, early maturity; C166-33, medium maturity; and IR-42, late maturity) and age of seedlings at transplanting (7, 14,21, 28, 35, and 42 days) on yield and other agronomic characteristics. Seedling mortality at 5 DAT did not vary greatly with respect to variety and seedling age. However, increasing seedling age extended the number of days to panicle emergence and heading. The test variety did not vary significantly on grain yield, harvest index in panicle length. However, IR-36 had the higher tiller production and number of panicles but with the greatest proportion of unfilled grains. C166-133 was the tallest and had the highest dry matter yield along with IR-42 at harvest. C166-133 had also the heaviest grains. Varying transplanting age did not effect yield and other components for grain weight and number of filled grains. 14-21 day old seedlings had initially better growth. Prolonging seedling age resulted initially to shorter plants, reduction in tillers and dry matter yield. Interaction between variety and transplanting age was significant only for panicle. grain weights and number and proportion of filled grains. It was concluded that the optimum transplanting age for wetbed seedlings is at 14-21 days regardless of variety. Yield performance wise, the medium and late maturing varieties have higher potentials although IR-36 because of shorter growing period could be a practical choise.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1979 A42 M34

Document Type

Thesis

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