There is, however, potential of expansion of rice area in the coastal wetlands in the outer islands. Dryland crops, however, usually follow the rice crop in rainfed lowland areas. Most irrigated lowland rice areas are located in floodplains. However, they can also be found on mountainsides wherever there is water. Rainfed lands are on both floodplains and undulating landscapes.
Uplands are mostly on undulating landscape.
Most of the flood-prone areas are coastal swamps affected by the rise and fall of tides. The use of modern rice varieties has increased markedly. Production of other food crops such as maize, soybean, peanut, and mungbean has been increasing at about the same rate as rice. Production constraints Long-term sustainability is a primary concern, particularly in the uplands. Weather, topography, and poor soils are the chief production constraints.