Effects of fertilization and season on the harvest index of promising rice varieties

Date

10-1968

Degree

Bachelor of Science in Agriculture

Major Course

Major in Agronomy

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Pedro M. Escusero

Co-adviser

Raymundo O. Obias

Abstract

The harvest indices of varieties included in the national lowland rice performance tests at the Central Experiment Station, College, Laguna during the 1967 wet and 1968 dry season were determined to study the effects of nitrogen fertilization and season on these varieties.

Correlation analyses revealed that the degree of association among harvest indices based on fresh and dry weights was high and significant in the dry season (r = 0.95) but low in the wet season (r = 0.57). Therefore, harvest index based on fresh weights can be recommended for use in the dry season but not in the wet season.

In both seasons, increased nitrogen application did not, in general, significantly affect both the fresh-hand dry-weight harvest index of the varieties.

Most of the varieties showed appreciable differences in dry-weight harvest index. The failure to detect differences in harvest index of the early to medium-early varieties due to the significant nitrogen x variety interaction. Generally, those varieties with high harvest index were short-statured and had a high number of productive tillers.

Conditions during the dry season increased significantly the harvest index of the varieties. In general, the season of planting had no differential affect on nitrogen and on variety as regards this trait.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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