The likelihood of polluting groundwater with pesticides and plant nutrients is enhanced by:
A) light tillage of the upper centimeter or so of soil.
B) the presence of macropores in the soil.
C) conventional tillage as a choice compared with conservation tillage.
D) the use of tillage to control weeds.
E) the production of oats rather than wheat.
Question 2
Which of the following will increase the evaporation (E) from the soil surface?
A) plastic mulch
B) the use of no-till culture
C) stubble mulch farming
D) adding straw mulch to the soil surface
E) none of the above
