[Factor] Cultivation system [Low risk] Annual ploughing [High risk] 
Continuous minimum tillage
C r o p m o n o c u l t u r e
C o n t i n u o u s m i n i m u m t i l l a g e
H e r b i c i d e o n l y
S i n g l e m o d e s o f a c t i o n
P o o r
H i g h
C o m m o n