Oilpalm yields have been falling, thus soils supporting oilpalms in Imo State's coastal plains sand have been explored. A bulked sample was taken at 0–20 cm and 20–40 cm depths at each of the ten sites investigated and analysed in the lab. Sandy clayloam dominated the soil's surface, whereas sandy clayloam dominated the subsurface. pH (4.1–5.6), ECEC (5.7–8.7 cmol/kg), BS (36–87%), OM (1–4.7 g/kg), TN (0.01–0.14 g/kg), Av. P (6–/kg), Fe (0–233 mg/kg), Cu (0–1.2 mg/kg), Zn (0.3–14 mg/kg), Mn (5.7–145.6 mg/kg) were the parameters measured at the topsoil. The condition modifiers g (gley – in the valleys), e (low cec), h (strong acidity), and k (strong acidity) were detected in the soils via the Fertility Capability Classification (fcc) (low content of k). However, the primary limiting factors by appropriateness rating were OM (N), TN (S3/N), and K (S3/S2). The soils were generally suitable (S2) for Oilpalm growth. Alluvial areas should be lightly drained, mild liming (particularly of alluvial soils), liberal nitrogen fertiliser application, and moderate potassium fertiliser application are all advised. The parametric assessment approach was more realistic than the non-parametric evaluation method.
Author (s) Details
E. P. Ukaegbu
Department of Agriculture Science, Alvan Ikoku Federal College of Education, Owerri, Nigeria.
S. K. Osuaku
Department of Agriculture Science, Alvan Ikoku Federal College of Education, Owerri, Nigeria.
C. C. Okolo
Department of Soil Science, University of Nigeria, Nsukka, Nigeria.
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