Lint percent variation and its association with yield and other traits in some promising cotton cultivars

Date

5-1989

Degree

Bachelor of Science in Agriculture

Major Course

Major in Agronomy

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

R. P. Cabangbang

Co-adviser

R. F. Bader

Abstract

Variation in lint percent and other characters such as lint yield per plant, total number and weight of bolls harvested per plant, boll and seed size, seed number per boll, branch number and plant height of ten promising cotton cultivars were evaluated at two cropping seasons (1987-89). Relationships among these characters were assessed in order to identify characters closely associated with lint percent and to generate a potentially high lint-yielding ideotype.

The cultivars exhibited substantial variation in plant height, total boll weight per plant, weight per boll, seed number per boll, and lint weight per plant, but not in seed size. Inconsistent variation between seasons was observed in branch number, total boll number, and lint percent. The amount in rainfall at critical growth stages apparently played a significant role on the response of these characters.

Correlations analysis showed that lint yield was positively associated with lint percent. Other traits were not consistently correlated with lint percent. This indicated that rainfall affected association among the characters evaluated. Path coefficient analysis showed that lint weight had the most substantial effect on lint percent. The other characters influenced lint percent via lint weight and total boll weight. The effect of lint weight on lint percent always counteracted the effect of total boll weight, and vice versa.

The results of the study showed that variability and interrelationships existed among the characters evaluated, thus breeding for higher lint yield should involve several parameters. Generally, potentially high lint-yielding cultivars are short, has more and bigger bolls, and has more seeds per boll. Climatological data must be considered in breeding programs since it can influence variation, manifestation and association among the different characters.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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