Abuja Journal of Agriculture and Environment (AJAE)

EFFECTS OF SOME PLANTATION CROPS ON MICRO-BIOLOGICAL PROPERTIES OF SOILS IN AKWA IBOM STATE, SOUTHEASTERN NIGERIA
Author(s): ABERAGI, F. V., ATOYEBI, B., OLIM, D. M. AND AFANGIDE, A. I.
Volume/Issue: Volume 2 , Issue 1 (2022)

ABSTRACT:

Tree crop plantations enhance the fertility of soil on which they grow by providing favourable micro-climate,massive organic litter and protection against erosion. Detailed quantitative scientific information on thesoils under different tree species plantations are needed to guide management of the plantation to ensure soilconservation. This study investigated the effects of plantation crops on microbiological properties of soils ofUyo and Ibecikpo Asutan Local Government Areas in Akwa Ibom State. Soil samples were collected at 0 -15cm depth in three plantations – oil palm (OPP), cashew (CAS) and Gmelina (GME). Total heterotrophicbacteria count (THBC) and total heterotrophic fungi count (THFC) were 14.58 x 105 cfug-1 and 8.51 x 105cfug-1 during the wet season while during the dry season they were 17.50 x 105 cfug-1 and 5.92 x 105 cfug-1respectively. THBC and THFC showed no significant difference (p>0.05) between seasons and plantations. THBC and THFC showed no significant (p>0.05) effect of plantation crop type and there was no significant difference between the seasons. The soils contained Bacillus, Achromobacter, Enterobacter, Clostridiumperfringers, Microccocus, Flavobacteria sp, Penicillium, Aspergillus, candida, monilia, Mould sp, and Fusarium sp. THBC was found as 17.25 x 105, 18.63 x 105, and 12.25 x 105cfug-1, while THFC was 6.94 x 105,5.58 x 105, and 9.13 x 105 cfug-1, respectively for OPP, CAS and GME. It was concluded that the relative abundance and diversity of the microorganisms encountered in the different plantation sites was an indication that the seasonal fluctuations of microbial population are due to moisture content of the soils which affect the total number of microorganisms in the soils. The higher population of micro organisms during rainy season can be attributed to favorable moisture contents of the soils which favors rapid multiplication and growth of microorganisms.

KEYWORDS:

Micro-biological properties, plantation, soil, moisture content, seasons.