Multiple Choice
In one field trial comparing no-till and conventional tillage,soil samples taken after 15 years without liming revealed that the pH of the upper 15 cm was lower on the no-till plot than on the conventional plot.Which of the following most likely accounts for this difference?
A) organic decomposition produced more organic acids in the no-till plot
B) earthworms were more active in the no-till plot
C) acidifying effects of nitrogen-containing fertilizers
D) Al3+ ions are tied up by the organic matter thereby releasing H+ ions
E) plowing mixes the surface soil more thoroughly
Correct Answer:
Verified
Correct Answer:
Verified
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