During the second phase (2012-2014), the aim of the Research Unit is to transfer and to expand the obtained knowledge on other soil types that are typically used for rice cultivation.
Vertisols, Ferralsols and Andosols play a major role for wetland rice production in Asia and are therefore included in the investigations. The three soil types represent the major range of soil properties to be expected in Asian paddy fields.
In addition, they characterize a different initial status of paddy soil evolution which started from weathered soil and not from fresh marine/brackish sediment substrates as in the chronosequence studied so far.
Thus, the second phase of the Research Unit focusses on different parent materials and correlated climatic regions, resulting in different main soil types (Ferralsols, Andosols, Vertisols), and how these soils are influenced by paddy management.
The Indonesian island of Java has an extremely high population density. Rice is the major staple crop and high yields are achieved on fertile soils like Vertisols and Andosols, but also less fertile soils like Feralsols are used for paddy rice production.
For a better link to our previous research area, we additionally selected sites dominated by low-activity clays in the Jiangxi province (China). They are either Acrisols or Fluvisols derived from eroded Acrisol material. Acrisols are the dominant soils in southern China and with that the dominant soils of the whole traditional rice-growing area of China.