Acrudox BR
A representative soil profile of a Typic Acrudox from Brazil.
Udoxs are well drained Oxisols with a udic soil moisture regime. They are moist because of natural rainfall in normal years and are dry in some parts for less than 90 days, a period that is short enough for rain-fed crops to be grown continuously in normal years. There are fewer than 90 days during which crops are not planted. In local terms there are 1 to 3 months that considered “dry” in normal years. Udox are an extensive suborder, occurring mostly in South America and in parts of Africa and Asia.
Acrudox are the Udox with very low CEC values in the subsoil and that do not have a sombric horizon within 150 cm of the mineral soil surface. Frequent but small applications of fertilizer and lime are required. Because the CEC is low, the amount of exchangeable aluminum in the subsoil is low. This deficiency can be corrected by leaching basic cations from lime and fertilizer.
Typic Acrudox are fixed on soils that do not have a petroferric contact, a lithic contact, or redox depletions with a color value, moist, of 4 or more and chroma of 2 or less within 125 cm of the mineral soil surface and also do not have aquic conditions for some time in normal years. These soils have less than 16 kg/m2 organic carbon to a depth of 100 cm and have less than 5 percent plinthite in all horizons within a depth of 125 cm. Their colors are reddish, but the soils do not have very dark reddish colors throughout the layers between depths of 25 and 125 cm.
For more information about the U.S. Soil Classification System and to view or download "Soil Taxonomy, 2nd Edition, 1999." click HERE.
To view, print, or save a pdf copy of the Keys to Soil Taxonomy, 13th Edition, 2022, visit Keys to Soil Taxonomy
For an overview video of Soil Taxonomy, click HERE.
Acrudox BR
A representative soil profile of a Typic Acrudox from Brazil.
Udoxs are well drained Oxisols with a udic soil moisture regime. They are moist because of natural rainfall in normal years and are dry in some parts for less than 90 days, a period that is short enough for rain-fed crops to be grown continuously in normal years. There are fewer than 90 days during which crops are not planted. In local terms there are 1 to 3 months that considered “dry” in normal years. Udox are an extensive suborder, occurring mostly in South America and in parts of Africa and Asia.
Acrudox are the Udox with very low CEC values in the subsoil and that do not have a sombric horizon within 150 cm of the mineral soil surface. Frequent but small applications of fertilizer and lime are required. Because the CEC is low, the amount of exchangeable aluminum in the subsoil is low. This deficiency can be corrected by leaching basic cations from lime and fertilizer.
Typic Acrudox are fixed on soils that do not have a petroferric contact, a lithic contact, or redox depletions with a color value, moist, of 4 or more and chroma of 2 or less within 125 cm of the mineral soil surface and also do not have aquic conditions for some time in normal years. These soils have less than 16 kg/m2 organic carbon to a depth of 100 cm and have less than 5 percent plinthite in all horizons within a depth of 125 cm. Their colors are reddish, but the soils do not have very dark reddish colors throughout the layers between depths of 25 and 125 cm.
For more information about the U.S. Soil Classification System and to view or download "Soil Taxonomy, 2nd Edition, 1999." click HERE.
To view, print, or save a pdf copy of the Keys to Soil Taxonomy, 13th Edition, 2022, visit Keys to Soil Taxonomy
For an overview video of Soil Taxonomy, click HERE.