ECOLOGICAL STUDIES ON TILE SYMBIOSIS OF TER ITOMYCES ...

2el*2 SOILS
The experimental sites around tlolcwa were at elevations between
180-230 m. The general area van gently undulating with broad inter-
fluvess and was occupied by soils of the Kulfo Association which are
developed on coarse Nupe Sandstone (Valette 1973)o The association
Is dominated by very deep, reddish soils with a sandy clay loam to
clay texture in the subsoil. Moat of the soils are ferrisolsl with
a sandy surface layer with low water-retention capacity. The soils
in the experimental sites were a complex mosaic of the Kulfo Series
(very deep, red sandy clay D horizon between 2511 and 6011) and the
Dangappo Series (very deep red clay D horizon within 25") (Valette
1979-
At nabba the soils on the northern boundary of the forest were
of the Rabba. Complex Association on an old alluvial sandy terrace*
The main characteristics were deep to very deep brownish sands (Valette
1973)e The forest was situated where the terrace descended to the
floodplaine The forest *oil was hydromorphics developed on alluviuml
with a dark Creyl weak crumb-structured topsoil (0-4ý5 cm) overlying a
laroely structurelesel pale yellow-grey subsoile In the wet season
the water table was at 50-150 cm (Wood et ale In press)*
Analyzes of reprosentative profiles are given in Table 2,1,1,
39.