The alluvial plains and terraces of Luzon and Mindoro have dark black cracking clays, as well as younger soils that are especially suitable for rice cultivation. Much of the land of the hilly and mountainous regions consists of moist, fertile soils, often with a significant concentration of volcanic ash, that support fruit trees and pineapples. Oil palms, vegetables, and other crops are grown in the peatlike areas, as well as in the younger, sand-based soils of the coastal plains, marshes, and lake regions. The dark, organic, mineral-rich soils of the undulating terrain of the Bicol Peninsula, much of the Visayas, and the northwest tip of Luzon are used to grow coffee, bananas, and other crops. Highly weathered, often red or yellow soils are prominent in the central and southern Philippines and are typically planted with cassava (manioc) and sugarcane; these soils also support forests for timber harvesting. The poor, precipitation-leached soils of Palawan and the eastern mountains of Luzon are largely covered with shrubs, bushes, and other secondary growth that typically emerges in areas that have been cleared of their original forest cover.
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