Path analysis of correlated parameters of an agricultural experiment on lettuce production under circulating hydroponics system using different soil substitutes /
by Marissa F. Marasigan
- Indang, Cavite : Cavite State University- Main Campus, 2008.
- xii, 45 pages : illustrations ; 28 cm.
Special Problem (BS Applied Mathematics - - Statistics) Cavite State University
Includes bibliographical references.
College of Arts and Science (CAS) College of Arts and Science (CAS)
MARASIGAN, MARISSA FAVOR. Path Analysis of Correlated Parameters of an Agricultural Experiment on Lettuce Production under Circulating Hydroponics System Using Different Soil Substitutes. Special Problem. Bachelor of Science in Applied Mathematics. Cavite State University. April 2008. Adviser: Mr. Antonio V. Cinto.
The study was conducted to present the use of path analysis in analyzing correlated parameters of an agricultural experiment considering the data on the study of Perey (2006) entitled “Design and Evaluation of Circulating Hydroponics System for Lettuce Production Using Different Soil Substitutes”. Specifically, it aimed to: (1) establish the coefficient of correlation among the parameters; (2) determine the path and strength of each parameter; and, (3) determine the characters that contribute greatly to the variation in yield. Four treatments representing four soil substitutes were used: T, — pure coir dust; T2 — 50% coir dust and 50% carbonized rice hull; T3 - 50% coir dust and 50% saw dust; and, T,- 50% coir dust, 25% carbonized rice hull and 25% saw dust. Six parameters were considered in this study: Plant Height; Number of Leaves, Leaf Diameter, Leaf Length; Root Length; and Plant Yield.
Assumptions of path analysis were tested to the parameters. Through Shapiro- Wilks and Kolmogorov- Smirnov tests, it was found that the data were normal. They were also linear as revealed by the scatter plots diagram.
The result of the correlation analysis showed that plant height, leaf length and leaf diameter were positively and highly significantly correlated with plant yield. Number of leaves was positively and significantly associated with plant yield, whereas, root length was negatively and non-significantly correlated with plant yield. Leaf diameter and leaf length had positive direct effects on plant yield, while plant height, number of leaves and root length exhibited negative direct effects on plant yield. The traits having positive direct effects are considered to be the major determiners for production of high yield. Thus, leaf diameter and leaf length are the strongest indicator for high plant yield of lettuce.