In what ways is soil improved as a result of earthworm activity? Are there possible detrimental effects as well? What is the rhizosphere, and in what ways does the soil in the rhizosphere differ from...

In what ways is soil improved as a result of earthworm activity? Are there possible detrimental effects as well? What is the rhizosphere, and in what ways does the soil in the rhizosphere differ from the rest of the soil?

Explain and compare the effects of tillage and manure application on the abundance and diversity of soil organisms. What is induced systemic resistance, and how does it work?