An acid soil is known to contain toxic quantities of a certain plant nutrient. Which of these essential elements is it most likely to be?
A) manganese
B) nitrogen
C) molybdenum
D) boron
E) phosphorus
Question 2
To monitor the effects of management on soil fertility, it is best to sample the soils in an area:
A) at the same season every time.
B) from the same depth every time.
C) every one to three years.
D) all of the above
E) none of the above