Soil Organic Matter MCQs Quiz 2

1. Turnover of labile carbon in soil organic matter typically occurs over _______

2. ________________ of soil organic matter contributes most to rapid nutrient cycling

3. ________is the fraction of soil organic matter that remains soluble across all pH levels (acidic, neutral, and alkaline)

4. Humin in soil organic matter is characterized as _______

5. Humic substances in soil organic matter are generally _______

6. Modern soil organic matter (SOM) theory emphasizes _______

7. The largest input to soil organic matter (SOM) in most agroecosystems is derived from _______

8. Non-humic substances in Soil Organic Matter include _______

9. Which mechanism provides physical protection to soil organic matter (SOM)? _______

10. Soil Organic Carbon (SOC) represents _______