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A series of laboratory and pot experiments carried out to examine the role of soil microbial biomass in red soils’ nitrogen availability and productivity showed that soil available N (N-A), dry matter yield (DMY) of ryegrass, and plant uptake of nitrogen were each closely correlated with microbial biomass|C (C-{mic}) or |N (N-{mic}), suggesting that soil microbial biomass is a very important nitrogen pool available to plants in red soils. After correction for the substrate effect, the computed turnover of the N-{mic} in three tested soils ranged from 63 to 250 days. Soils with low N-{mic} or light texture generally had higher N-{mic} turnover rate than those with high N-{mic} or heavy texture. These results showed that soils with low N-{mic}, microbial biomass could also play an important role in the availability of nitrogen to plants due to these soils’ high turnover rate.
A series of laboratory and pot experiments carrying to examine the role of soil microbial biomass in red soils’ nitrogen availability and productivity showed that soil available N (N - A), dry matter yield (DMY) of ryegrass, and plant uptake suggesting that the soil were each closely correlated with the microbial biomass | C (C - {mic }) or | N (N - {mic }), suggesting that the soil microbial biomass is a very important nitrogen pool available to plants in red soils. After correction for the substrate effect, the computed turnover of the N - {mic } in three tested soils ranged from 63 to 250 days. Soils with low N - {mic } or light texture generally had higher N - {mic } turnover rate than those with high N - {mic } or heavy texture. These results showed that soils with low N - {mic }, microbial biomass could also play an important role in the availability of nitrogen to plants due to these soils’ high turnover rate.