Raising soil organic matter in European arable lands: A viable option at field, farm or regional level?

Agriculture & Biology

1. soil organic matter 100%
2. crop production 98%
3. farming systems 87%
4. mineral fertilizers 70%
5. long term experiments 47%
6. farm surveys 41%
7. farmers 34%
8. sandy soils 30%
9. dry climates 24%
10. fertilizer application 18%
11. weeds 15%
12. crops 15%
13. climate 15%
14. potatoes 14%
15. pests 14%
16. environmental factors 12%
17. horticultural crops 11%
18. onions 9%
19. sugar beet 9%
20. tillage 9%
21. cropping systems 9%
22. animal manures 9%
23. soil quality 8%
24. vegetables 7%