Applied and Environmental Soil Science / 2012 / Article / Tab 3

Research Article

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

Table 3

Soil carbon and nitrogen concentrations 51 d after amendment with various rates of flax or mustard oilseed meals or sorghum-sudangrass biomass.

Amendment rate (%)Biomass typeSoil nutrient concentrations
Total C
(g kg−1 soil)
Organic C
(g kg−1 soil)
Added organic
C remaining (%)
Total N
(g kg−1 soil)
NH4-N
(mg kg−1 soil)
NO3-N
(mg kg−1 soil)

0.5Unamended12.95a5.77a0.90a2.33a37.67a
Flax13.84b6.57b45.68a1.06b6.93ab147.20b
Mustard13.33ab6.70b53.36a1.13b10.82ab161.83b
Sorghum-sudangrass13.60ab6.96b71.13a0.82a16.82b9.73c

1.0Unamended12.95a5.77a0.90a2.33a37.67a
Flax14.42ab7.76bc47.12ab1.33b11.26b239.17b
Mustard13.68a7.04b33.71a1.36b13.68b278.27b
Sorghum-sudangrass16.52b8.00c60.20b1.15ab23.02c3.50c

2.5Unamended12.95a5.77a0.90a2.33a37.67a
Flax17.22b9.76b35.18a2.07b23.66b601.17b
Mustard15.34c8.42c25.26a1.90b296.58c243.30c
Sorghum-sudangrass19.24d21.60d67.44b1.16c5.52a3.03d

5.0Unamended12.95a5.77a0.90a2.33a37.67a
Flax23.30b16.57bc45.36a2.72b701.66b2.97b
Mustard22.25b14.99b40.52a2.98b853.64b3.73b
Sorghum-sudangrass25.18b19.34c65.45b1.46a4.93c2.83b

Means within a column, for a given amendment rate (including the unamended control), followed by the same letter(s) are not significantly different at .

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