If we view soil organic matter with a systems perspective, based on Figure 12.4, can you describe the relative balance of the system before and after agriculture? What would it take to restore equilibrium in the organic system of soils used for crop agriculture?

Figure 12.4

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Inputs TOOLS Topse 1800 S outpuis outputs inouts= outputs) 2000 imputa outpuls outputs (outputs exceed nouts) 2000 inales ou pula outputs (outputs exceed inputs)