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PHYSICAL AND CHEMICAL PROPERTIES OF COCOA GROWING SOILS OF BOKI, CROSS RIVER STATE NIGERIA
Abstract
Some physical and chemical properties of cocoa growing soils in six cocoa growing communities in Boki, Cross
River State, Nigeria were assessed to ascertain their suitability for sustainable cocoa production. Twelve farms
were randomly selected in Bunyia, Kakwagom, Ogep-Osokom, Isobendegbe, Bashua and Olum. Twenty four
(24) composite representative soil samples were collected from the farms, analysed using standard laboratory
procedures. Results show that the soil textural classes ranged from sandy loam to clay loam [sand (58.45%), silt
(13.46%) and clay (28.09%)]. The mean values of the chemical properties include: pH (5.56), EC (0.021ds/m),
OM (3.24%), TN (0.09%), Av. P (5.77 mg/kg), K (0.12 cmol/kg), exch. Mg (2.06 cmol/kg), exch. Na (0.05
cmol/kg), EA (1.61 cmol/kg), ECEC (9.00 cmol/kg) and Base saturation (81.25%). Total Nitrogen,
Exchangeable Calcium, Exchangeable Magnesium and Base Saturation were adequate within and above
recommended levels, while Available phosphorus, Potassium, Organic Matter, Electrical Conductivity and
ECEC were below critical levels. For increased yields and sustainable cocoa production in Boki, incorporation of
organic manure and other residues and application of appropriate rates of phosphorus and potassium fertilizers
are therefore recommended.
