Global Journal of Biology, Agriculture & Health Sciences

Abstract

STUDY OF ROOT GROWTH PARAMETERS OF PLANTS (GLYCINE MAX L., VIGNA SUBTERRANEA L. AND ZEA MAYS L.)IN DIESEL OIL POLLUTED SOIL

Ogbuehi HC, Ogbonnaya CI, Ezeibekwe IO

A field trial study was conducted in 2010 to investigate the study of root growth parameters of plants (Glycine max L. , Vigna subterranean L. and Zea mays L.) in diesel oil polluted soil in Owerri, Imo State, Nigeria. The experiment was split-plot design based on randomized complete block design. The crop plants constituted the main plots and diesel oil pollution levels (0, 1.0, 1.5 and 2.0 litres) constituted the sub plots and each treatment was replicated five times. The result showed that diesel oil pollution at all levels significantly affected growth parameters of Glycine max, Vigna subterranean and Zea mays L. The result indicated that number of roots, root lengths and root dry weights were significantly reduced by treated plots (1.0, 1.5 and 2.0 liters pollution levels respectively) compared to the control plots. The relative growth rate (RGR) was found to be affected by time of analysis, level of diesel oil pollution and crop specie. Comparatively Glycine max L. (soybean) at early stage of growth performed significantly better in number of roots than Zea mays L. (maize) and Vigna subterranean L. (Bambara groundnut). At maturity stage, maize plant performed better in root length and dry weight in 2.0litres pollution level than soybean and Bambara groundnut showing tolerance. This study have shown that diesel oil pollution at high dose reduced root growth parameters which adversely affected growth and development of these crop plants ,thereby causing reduction in yield subsequently hunger and disease in society.