Performance of variety mixtures in direct-wet-seeded irrigated lowland rice (Oryza sativa L.)

Date

7-2015

Degree

Bachelor of Science in Agriculture

Major Course

Major in Agronomy

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Jose E. Hernandez

Abstract

A study was conducted to evaluate the performance of 11 variety mixtures using NSIC Rc 140, NSIC Rc 150, NSIC Rc 152, NSIC Rc 160 and NSIC Rc 216 as component varieties under direct wet-seeding method of crop establishment. Comparing grain yield of variety mixtures over yield of individual component varieties in pure stand, significant yield increases were observed over NSIC Rc 140 and NSIC Rc 150 while a significant decline over the yield of NSIC Rc 152 was observed. However, comparing yield of variety mixtures over mean yield of their component varieties in pure stands showed that there is no advantage in growing varieties together in mixtures over growing them in pure stands altogether. The expected advantage of variety mixtures over pure stands with regards to management of diseases specifically rice tungro virus (RTV) cannot be measured since the incidence of RTV was very low to effect significant yield increase or decrease in the variety mixtures evaluated. Incidence of lodging was noted in the pure stand of NSIC Rc 140. Advantage of mixtures in terms of tolerance to lodging is inconclusive. Significant advantage of mixtures over pure stand in terms of mean 1000-seed weight was observed only in one variety mixture. Early maturing varieties tend to mature longer while medium maturing varieties tend to mature earlier when grown in mixtures. Shorter varieties tend to increase in height while taller varieties did not grow as tall as expected when grown together as components in variety mixtures.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2015 A3 /V47

Document Type

Thesis

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