Which of the following contributes most positively to soil quality?
A) using irrigation to raising the water table in dry regions
B) monoculture cropping systems
C) combinations of organic and inorganic inputs
D) removal of crop residues to discourage disease build-up
E) high N and P fertilizer inputs
Question 2
The distribution of different soil orders suggests all but one of the following:
A) Mollisols are not very widespread in the tropics.
B) Alfisols are found mostly in semiarid areas.
C) Most Oxisols are found in Latin America and Africa.
D) Aridisols are more extensive in Africa than in Asia and Latin America.
E) Vertisols are most prominent in humid rainforest areas.
