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microbial biomass

Catalogue: GRDC Updates
Agricultural soils have lost approximately half (~ 50 t/ha) of their organic carbon since the industrial revolution, a loss that has greatly contributed to soil degradation... We have shown, in experiments with wheaten straw incubated in a variety of soils, that the conversion of the straw into humus (which is much richer in N, P and S than are crop residues) is increased three to tenfold by augmenting the residues with supplementary nutrients according to the established ratios... We hypothesised that adding some extra nutrients (N, P and S) would lead to more microbes being formed than without the extra nutrients and that this would lead to faster stubble decomposition and more plant-C being transformed into humus-C because, we believe, humus is largely dead microbes not dead plant material...
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Catalogue: GRDC Updates
" Date: 08.10.2009 USING ROTATION CROPS TO IMPROVE SOIL QUALITY.. Soil structural differences are measured with a cone penetrometer which determines the force needed to push a metal probe slowly into the soil to 600 mm depth... We measured the microbial properties using surface soil samples (0-10 cm) from the crop rotation experiment...
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