Applied and Environmental Soil Science / 2012 / Article / Tab 4

Research Article

Impact of Indian Mustard (Brassica juncea) and Flax (Linum usitatissimum) Seed Meal Applications on Soil Carbon, Nitrogen, and Microbial Dynamics

Table 4

Microbial lipid biomarkers in soil 3 and 28 days after amendment with various rates of flax or mustard seed meal or sorghum-sudangrass biomass.

Time
(days)
Amendment rate (%)Biomass typeTL-FAME1 markers (nmol g−1 soil)
Total bacteriaGram + bacteriaGram − bacteriaFungiTotal2Fungal : bacterial ratio

30Unamended15.86a7.64a8.22a9.30a25.16a0.59a
0.5Flax30.21bc15.54b14.68a23.19b53.40b0.77a
0.5Mustard25.83b18.29b7.54b113.36c139.20c4.44b
0.5Sorghum-sudangrass33.69c25.02c8.67a86.84d120.53d2.57c

30Unamended15.86a7.64a8.22a9.30a25.16a0.59a
5.0Flax57.80b35.54b22.25b40.95b98.74b0.71b
5.0Mustard42.82c24.00c18.82bc206.10c248.91c4.80c
5.0Sorghum-sudangrass56.37b42.79b13.58ac2.31d58.69d0.04d

280Unamended16.66a8.21a8.44a16.09a32.75a0.97a
0.5Flax34.45b18.05b16.40b41.92ab76.38ab1.21ab
0.5Mustard45.19b25.96c19.23b34.42ab79.61ab0.76a
0.5Sorghum-sudangrass33.74b22.42bc11.32a73.04b106.78b2.51b

280Unamended16.66a8.21a8.44a16.09a32.75a0.97a
5.0Flax83.66bc49.14b34.52b99.58a183.24b1.19a
5.0Mustard120.34b97.62c22.72ab202.59b322.92c1.69a
5.0Sorghum-sudangrass81.67c59.58b22.10ab103.26a184.93b1.34a

Means within a column, for a specific amendment rate (including the unamended control) and day, followed by the same letter(s) are not significantly different at .
1TL-FAME: total lipid-fatty acid methyl ester analysis.
2Total TL-FAME marker represents the sum of Gram-positive bacteria, Gram-negative bacteria, and fungi for a given community.

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