PEDOGENESISOF THEPHILIPPINES

Pedogenesis

• is the science and study of the processes that lead to the formation of soil (soil evolution)

Luzon

3 GROUPS OF SOIL RESOURCES 3 GROUPS OF SOIL RESOURCES OF CENTRAL LUZONOF CENTRAL LUZON

1)Alluvial soils of the floodplains of Pampanga, especially the Candaba Swamp; part of Bulacan and Nueva Ecija.

2)Volcanic soils of the piemont and upland areas of Zambales, west and southwestern part of Tarlac around the vicinity of Mt. Arayat in Pampanga, and eastern part of Bulacan and Nueva Ecija.

3)Residual soils derived from sedimentary rocks in the mountains and upland areas of Lake Uacon of Zambales, Pantabangan of Nueva Ecija and AngatDamof Bulacan, major and minor rivers of Region III, and the wetlands along the coastal plains of Pampanga and Bulacan.

Alluvial soil

• a fine-grained fertile soil deposited by water flowing over flood plains or in river beds

• clay or silt or gravel carried by rushing streams and deposited where the stream slows down

Volcanic Soil

• also known as Andisols, are formed from volcanic ash and cinder deposits.

• Andisols are usually light and fluffy and are easily tilled.

• typically very fertile soils

Residual Soil

• the soil that is remaining after the soluble elements have been dissolved

• the part of the earth's surface consisting of humus and disintegrated rock

Visayas

Highly weathered soils (or strongly weathered

soils) are soils that have undergone prolonged and intense weathering under the net leaching environment of the humid tropics.

• These soils are clayey, deep, reddish, acidic, and have low nutrient status

Mindanao

Loam soil is soil composed of

sand, silt, and clay in relatively even proportions

contain more nutrients, moisture and humus