Allometric Equations for Estimating Silk Oak (Grevillea robusta) Biomass in Agricultural Landscapes of Maragua Subcounty, Kenya

Table 2

Classification and description of soil in Maragua subcounty.

AEZ	Physiographic Lithology	Soil description
UM 1	MV2	Well drained, very deep, dark reddish to dark brown, very friable and smeary, clay loam to clay, with thick acid humic topsoil, in places shallow to moderately deep and rocky: Humic ANDOSOLS, partly lithic phase
UM 2	RB1	Well drained, extremely deep, dark reddish brown to dark brown, friable and slightly smeary clay with an acid humic topsoil: Ando-humic NITISOLS: with humic ANDOSOLS.
	RB2	well drained, extremely deep, dusky red to dark reddish brown, friable clay with an acid humic topsoil: humic NITISOL
UM 3	RB3	Well drained, extremely deep, dusky red to dark reddish brown friable clay; with inclusion of well drained, moderately deep, dark red to dark reddish brown, friable clay over rock, pisoferric or petroferric materials. Eutric NITISOLS: with nito-chromic CAMBISOLS and chromic ACRISOLS and LUVISOLS, partly lithic, pisoferric or petroferric phase
UM 4	LB1	Well drained, very deep, dark red, very friable clay: Nito-rhodic FERRALSOLS.