"Evaluation of competition between mungbean(Vigna radiata (L.) Wilzeck) and aguingay (Rottboellia exaltata L. f.)"

Date

11-1981

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Percy E. Sajise

Abstract

A study was made to evaluate the competition bet-ween mungboan and aguingay using fertilization, plant population density and period as variables. Parameters used to determine the relative competitive abilities of each of the species were B, the density response measurement; relative crowding coefficient (RCC); and replacement diagrams. Agronomic characters such as total dry weight, plant height, root length, tiller, pod, and panicle number were also obtained to evaluate competition effects. Fertilizer was applied at 2G-20-20 kg/ha, while density was varied from four, six to eight plants per pot or density equivalent of 400,000, 600,000, and 800,000 plants per hectare respectively. Five harvest (sampling) periods were done at biweekly interval. B, RCC, and replacement diagram showed that mungbean was competitive up to the fourth harvest period which was about 63 days after seeding. This implied that mungbean was able to stand competition with aguingay up to its maturity. Aguingay, however, during this stage was about four times taller and eight times heavier than mungbean which showed the relative ineffectiveness of mungbean in suppressing the tremendous vegetative growth of aguingay. The greatest increase in biomass occured between the third and fourth harvest which were about 49 to 63 days after seeding. Aguingay should , therefore, be weeded out before the 49th day after seeding. Aside from this aguingay in mixture with mungbean also showed the tendency to promote panicle production, thus the more reason to remove aguingay before it can produce the tremendous amount of seeds it is capable of producing bean could still tolerate an equivalent density of 800,000 plants per hectare (8 plants per pot) without being affected by intraspecific under fertilized condition. It is not advisable, therefore, to plant mungbean in monoculture in a R. exaltata infested area. They can, however, be intercropped with a species of similar morphology with aguingay such as corn. Mungbean was most competitive at eight plants per pot, less competitive at six plants per pot., and least competitive at four plants per pot based on the RCC. Above ground competition most probably favored mungbean in the denser pots due to its preference for partial shading. The use of 20-20-20 kg/ha per pot was generally inadequate to cause any significant effect on competition patterns between the two species studied. Further study could be done to modify B measurements by predetermining saturation densities and including them in the experimental set ups.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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