Measures of earliness in cotton (Gossypium Hirsutum L.)

Date

3-1989

Degree

Bachelor of Science in Agriculture

Major Course

Major in Agronomy

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Rodolfo P. Cabangbang

Co-adviser

Raymond F. Bader

Abstract

Variability in characters that measure earliness of crop maturity in cotton was evaluated in 18 breeding lines. Relationships among these characters were determined in order to identify suitable characters that give the most reliable and practical measure of crop maturity.

The varieties used exhibited substantial variation for phenological and product-quantity parameters, indicating the success in selecting the materials for this study. Based on the mean comparison test, the cultivars were classified as early, intermediate and late maturing in order to assess the consistency and correlation of each parameter. Likewise, correlation analyses reveal that there was a significant correlation among the parameters. the mean maturity date based on number of harvested bolls (MMDn) was the most highly correlated. The path coefficient analyses show that days to first flower (DFF) is the most important factor affecting the mean maturity date (MMD), owing to its high direct effect.

The results of the study confirms the convenience and reliability of using days to first flower from planting (DFF) as an early estimate of earliness of cotton maturity. This phenological parameter adequately characterizes the maturity of the cotton crop. The mean maturity date (MMD) gives the most practical product quantity measure and suitably characterize at the later stages of the crop. More than one measure should therefore be used for practical breeding purposes.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1989 A42 S65

Document Type

Thesis

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