Concurrent Observation of Several Processes of Nitrogen Metabolism in Soil Amended with Organic Materials : I. Effect of Different Organic Materials on Ammonification, Nitrification, Denitrification, and N_2 Fixation under Aerobic and Anaerobic Conditions

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Pot experiments were carried out to determine the effects of single and mixed inoculations with phosphorus-solubilizing bacteria and vesicular-arbuscular mycorrhizal (VAM) fungi on the growth of Leucaena leucocephala, Acacia confusa, Acacia mangium, and Liquidamber formosana in three subtropical tropical soils. The growth responses of leucaena to the inoculation with and without sterilized soils, with an average of 33.2%. Leucaena growth significantly increased by 22-99% in VAM fungal inoculation in the three soils. A synergistic effect of mixed inoculation with P-solubilizing bacteria and VAM fungi on the growth of leucaena occurred in unsterilized Wufun soil. Inoculation with these mixed inoculation also promoted the growth of Acacia confusa (14 to 63%), A. mangium (7 to 88%), and Liquidamber formosana (24 to 280%) in these three soils. The results show that soil property is a significant factor in the modification of the response of these three tree species to the P-solubilzing bacteria and VAM fungi inoculations. The beneficial effect of P-solubilizing bacteria can be demonstrated in soils with a high content of available P (95g/g soil).
社団法人日本土壌肥料学会の論文