I haven't thrown one of these up for awhile, but since I finished this big one on Monday ...
Areas of dense cropland or cropland & pasture are calculated by size of town, elevation and regional borders. The area detailed is immediately East of the map shown here. The ridge of the Carpathian mountains is visible by the line of green coniferous forest running semi-horizontally through the middle of the map. Most of the central part of the map south of the Carpathians is the Magyar Plain - the cropland and pasture in those parts would be mixed with prairie/steppe.
The heaviest density follows the Danube through the south half of the map, but note the large area of green mixed cropland in the NW of the map ... that's Poland. The Pripet Marshes, that bogged down the Germans in WWII, is visible in the NE. The mixed forest and the coniferous forest to the north of them is the start of the great Russian taiga.
My apologies. The transfer of program to jpeg insists on cutting off the names on labels, and I haven't caught them all.