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The Chemistry and Fertility of Soils under Tropical Weeds 137
Chapter 8
Effects of Tropical Weeds on Heavy
Metals
8.1 The Chemistry of Heavy Metals in Soils
8.2 Effects of Weed Management
8.3 Effects of Forest Conversion
Key Questions
H
eavy metals are of two categories: plant nutrient heavy metals that
includes those needed by plants like Fe, Mn, Cu, Zn, and Mo and non-plant
nutrient heavy metals like Pb, Cd, Hg etc that are not needed by plants.
Both categories show similar chemical characteristics and similar behaviors in the
soil environment. Both categories are absorbed by plant roots and toxic at high
concentrations.
Abdul Kadir Salam and Nanik Sriyani – 2019
