1. Analysis of Tropical Rain Forest Soil & Tropical Dry Forest Tree  Determination of Soil pH  Comparison of Available NH4-N and NO3-N  Comparison of % N in Soil and Pochote  Comparison of % N and C:N Ratio  Comparison of Elemental Concentration in Soil and Pochote  Comparison of Exchangeable Cations and Elemental Concentration  Determination of CEC Teiko Breid 6-1-1999

2. Determination of Soil pH  Salt (CaCl2) decreases pH  pH Range = 5.76 ~ 3.81  Tropical Rain Forest Soil was Acidic  Acidic soil may have unacceptably high concentration of Al

3. Available NH4-N & NO3-N at Different Depths

4. Available NO3-N vs NH4-N  Available NO3-N > NH4-N  Pit 7 had the highest NO3-N & NH4-N  Pit 1 had the lowest NH4-N  Pit 5 had the lowest NO3-N

5. % Nitrogen in Soil & Pochote

6. % Nitrogen vs C:N Ratio

7. Elemental Concentration in Soil

8. Elemental Concentration of Soil without Al

9. Elemental Concentration of Pochote  Pochote at Pit 7 had high prime nutrient, K  Pochote at Pit 1 had high toxic Al  Pochote at Pit 10 had high Ca

10. Plant Elemental Concentration / Soil Elemental Concentration  Bohn: S > Ca > K > P > Mg > Na > Al  Mine: K > Ca > S > P > Mg > Na > Al

11. Exchangeable Cations at Different Location

12. Cation Exchange Capacity at Different Location  The upper depths soils contained slightly higher CEC then the lower depths soils  Pit 10 had the highest CEC

13. % Exchangeable Cations  Ca had highest exchangeable percentage  The prime nutrient, K had the 2nd high exchangeable percentage  Pit 10 had the highest percentage of Al

14. Conclusion  Tropical rain forest soil was acidic  Pit 10 was the most acidic soil and had the highest Al concentration and lowest % N and low K  Only pit 10 is located at slope  Much lower % N at lower depths than at upper depths  Much lower exchangeable cations at lower depths than at upper depths