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The Fertility of Tropical Soils under the Influence of Agricultural
Man and the Biosphere
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addition Africa African Railways agricultural production air brakes Amazon Amazonia animal areas Asia average breeding calves cassava cattle central Java centres chemical climate co-operative considerable costs crops developing countries diseases distribution East ecological economic effects epilimnion equipment example exist factors farms field forest gauge growth Gulf of Thailand harvest hectare humus important improved increase Indonesia industrial countries irrigation Java Klaten labour lakes land low-income countries machinery machines maize material means mechanization methods milk million mineral nozzles nutrients nutrition oil palm operation organic particularly plague plant population possible problem processes programme protein rainy period regions result rice rolling stock season shifting cultivation South species spray square kilometre structure supply technical techniques temperature Thailand tion trawl fishery tropical soils tropical technology vacuum brake Varzea vegetation wheel-sets yield Zebu-Azaouak zone