Soils of Hamakua - ctahr

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Soils of Hamakua - ctahr

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CEC. Negatively charged sites that adsorb cations: Ca2+, Mg2+, K+, NH4+. Brady & Weil, 2004. Elements of the Nature and Properties of Soils ...

Soils of Hamakua Concepts in Soil Fertility Jonathan Deenik Assistant Specialist, Soil Fertility Department of Tropical Plant and Soil Sciences

Outline • Importance of Soils

• Concepts in Soil Fertiltiy - Clays - pH - CEC - Organic matter

• Soils of Hamakua

- N and P

Medium for Plant growth

Water supply and purification

Recycling system

5 Functions of Soil

Habitat for Soil organisms

Engineering Medium

Plant Growth Factors

Essential Plant Nutrients Air and water: C, H, O Macronutrients: N, P, K, Ca, Mg, S Micronutrients: B, Cu, Fe, Mn, Zn, Mo, Ni, Co, Cl

Soil Factors Affecting Plant Nutrients zType

and amount

of clay zpH zOrganic matter zWater

Idealized Soil Composition

50% Solids

45% Mineral

25% H2O 25% Air

5% Organic Matter

50% Pores

Composition of Hamakua Soils z z

Defy conventional rules of soil science Why?

- Made from weathered volcanic ash with -

exceptionally high surface area High organic matter content (20%) Very low bulk density (0.4)

Clay is Where the Action is! Clay Properties: Microscopic size (