Rewriting PTR salinity, alkalinity, chemical toxicity and
drainage based on the wrb-standard Review of available
information in the SGDBE In the SGDBE, the attribute WR gives
information about the water regime of the STU following 4
classes. This attribute gives information about the duration and
the depth where the soil is saturated by water during the year.
The relation between the values of this attribute and the
drainage classes used for CGMS is given in Table 4-21. The class
4 of WR is corresponding to the VP (very poorly drained) class
used in CGMS. But for the other classes of WR, there are several
CGMS classes that correspond. For these WR classes, it is
necessary to use other information to choose which CGMS class
corresponds. To do so, the information from the soil name
(FAO85- FULL, FAO90-FULL and WRB-FULL) and the agricultural
limitations (AGLIM1, AGLIM2) will be used. These attributes will
also be used when WR is not given (that is the case for all the
data coming from the Digital Soil Map of the