The addition of large quantities of plant residues to the soil generally ____ the incidence and severity of soil-borne plant diseases.
A)increases
B)reduces
C)has no effect on

Question

Quizplus · Accepted Answer

Adding plant residues to the soil can increase soil organic matter, which enhances microbial diversity and activity. This can lead to suppression of soil-borne plant diseases through increased competition, predation, or antagonism against disease-causing organisms. Therefore, adding plant residues to the soil usually reduces the incidence and severity of soil-borne plant diseases.

The Addition of Large Quantities of Plant Residues to the Soil