Potassium supplying capacity of soils formed on different geological deposits in the Niger Delta region of Nigeria

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• 作者：Loganathan ; P. ; Dickson ; A.A. ; Isirimah ; N.O.
• 刊名：Geoderma
• 出版年：1995
• 出版时间：February, 1995
• 年：1995
• 卷：65
• 期：1-2
• 页码：109-120
• 全文大小：631 K

文摘

The potassium supplying capacity of soils formed on three geological deposits along an east-west transect in the Niger Delta region of Nigeria was investigated by determining the various forms of soil K and K uptake by repeated maize croppings in pots. Soils (Inceptisols and Entisols) formed on recent alluvial materials of the Meander Belt deposits (MBD) had mica and feldspars resulting in very high levels of total K (4.4 and 5.1 % ) and nonexchangeable K (NEK) extracted by concentrated H₂SO₄ and boiling HNO₃ (H₂SO₄-K: 378 and 477 μg g⁻¹; HNO₃-K: 158 and 174 μg g⁻¹). Soils formed on the other two geological deposits (Sombreiro-Warri deposits, SWD, and Coastal Plain Sands, CPS) had low levels of total K (CPS, 0.18-0.37 % and SWD, 0.28-1.76 % ) and NEK (H₂SO₄-K and HNO₃-K for CPS were 40-87 and 18-49 μg g⁻¹ respectively and for SWD they were 40-158 and 14-80 μg g⁻¹ respectively) indicative of the highly weathered nature of these soils (Ultisols) with traces of K-containing minerals. The trend in soil K levels in the three deposits are opposite of the previously reported soil P trend.