This definition tends to equate the ploughed lands with the cultivated lands. Hence, the difficulties arise because of the definitions by the countries. In Central Asia the lands under meadows, pastures and gardens are not covered by the definition of ploughed lands.
Irrigation is used on all kinds of the mentioned arable and pasturelands.
The national report on condition of the environment, 1998. The numerous ways of calculation of the yield are also not standardized and not always clear. The irrigation potential is determined on the assumptions, which differ from country to country. Except for the double calculation of the divided water resources, damp grounds and plains subject to floods usually, but not systematically, are included in the irrigation potential. This is the definition, which is used in Central Asia with regard to the notion of the irrigated lands.