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153 REFERENCES Abraham, J. and Chudek, J. A. (2008). Studies on litter characterization using 13 C NMR and assessment of microbial activity in natural forest and plantation crops’ (teak and rubber) soil ecosystems of Kerala, India. Plant and Soil, 303: 265–273 Adejuyigbe, C. O. (2000). Effects of fallow legumes on soil micro arthropods and their roles in nutrient turnover under humid tropical conditions. Ph.D. Thesis, University of Ibadan, Ibadan, Nigeria Ahenkora, E. M. and Nuertey B. N. (1999). The role of leguminous cover crops in sustainable production of oil palm (Elaeis guinensis) - a review. Journal of the Ghana Science Association, 1(2): 148-157 Alcala, E. A. (2007). Rubber: Manual for Rubber Smallholders in the Philippines. Kabacan, North Cotabato. USM and PRBI, 72 p. Alexander, M. (1977). Introduction of the rhizosphere. In: Introduction to Soil Microbiology. 2 nd Edn. John Wiley & Sons, New York, pp. 423-433 Allison, S. D. (2005). Cheaters, diffusion and nutrients constrain decomposition by microbial enzymes in spatially structured environments. Ecology Letters, 8: 626–635 Allison, V. J., Condron, L. M., Peltzer, D. A., Richardson, S. J. and Turner, B. L. (2007). Changes in enzyme activities and soil microbial community composition along carbon and nutrient gradients at the Franz Josef chronosequence, New Zealand. Soil Biology and Biochemistry, 39(7): 1770-1781 Allison, S. D. and Jastrow, J. D. (2006). Activities of extracellular enzymes in physically isolated fractions of restored grassland soils. Soil Biology and Biochemistry, 38(11): 3245-3256 Allison, S. D. and Vitousek, P. M. (2005). Responses of extracellular enzymes to simple and complex nutrient inputs. Soil Biology and Biochemistry, 37(5): 937-944 Amalu, U.C. (1992). Survey of properties and constraints of the acid sands of Mid- West Nigeria to higher yields of Rubber (Hevea brasiliensis Muell. Arg.) trees. Nigeria Journal of Agricultural Science, 6: 34–40
Transcript

153

REFERENCES

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NMR and assessment of microbial activity in natural forest and plantation

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Adejuyigbe, C. O. (2000). Effects of fallow legumes on soil micro arthropods and

their roles in nutrient turnover under humid tropical conditions. Ph.D. Thesis,

University of Ibadan, Ibadan, Nigeria

Ahenkora, E. M. and Nuertey B. N. (1999). The role of leguminous cover crops in

sustainable production of oil palm (Elaeis guinensis) - a review. Journal of the

Ghana Science Association, 1(2): 148-157

Alcala, E. A. (2007). Rubber: Manual for Rubber Smallholders in the Philippines.

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Alexander, M. (1977). Introduction of the rhizosphere. In: Introduction to Soil

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