Agriculture Reference
In-Depth Information
The particle size distribution of soil organic matter varies considerably between soils,
and with depth in the profile (Figure I.45). The results presented below were obtained in
regions of comparable climate (average annual rainfall: 1200-1300 mm; mean temperature
26-27 °C) and suggest that:
(i) Soils with high concentrations of active clays such as vertisols accumulate much
larger amounts of organic matter than sandy soils which have a relative dominance of
coarse and fine particles;
(ii) Tropical forest soils have a larger proportion of coarse organic particles (39.5 % as
compared to 23.4 % in the adjacent grass savanna), and a larger overall abundance of
organic matter;
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