Soil Organic Matter MCQs Quiz 2

1. Humin in soil organic matter is characterized as _______

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

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

4. Humic substances in soil organic matter are generally _______

5. Soil Organic Carbon (SOC) represents _______

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

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

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

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

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