presentation
presentation
presentation
SHOW LESS
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Regions with environmental problems>50 mg NO 3 /l>5t/ha/a soil loss25km 2 squares with >50%arable land~ 11 % of arable land~ 5 % of arable land ~ 68 % of arable land