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Tropical zones --- Tropical zones --- agriculture. --- agriculture --- Cereals --- Cereals --- Sugar crops --- Sugar crops --- Root crops --- Root crops --- Fibre crops --- Fibre crops --- oil crops --- oil crops --- Stimulant crops --- Stimulant crops --- Rubber crops --- Rubber crops --- Spice crops --- Spice crops --- Fruit crops --- Fruit crops --- Vegetables --- Vegetables --- Poaceae --- Poaceae --- grasslands --- grasslands --- Grazing --- Grazing --- Rangelands --- Rangelands --- Fertilizer application --- Fertilizer application --- Tropics --- Tropics