The study aims to elucidate the impact of organic
inputs on strength and structural stability of aggregates in a sandy
loam soil. Tensile strength, friability and water stability of aggregates,
and the carbon contents in bulk soil and in large macro (>2 mm),
small macro (0.25-2 mm), micro (0.053-0.25 mm) and silt+clay
size (<0.053) aggregates were evaluated in soils from a long-term
experiment with rice-wheat rotation at Modipuram, India, with
different sources and amounts of organic C inputs as partial substitution
of N fertilizer. Addition of organic substrates significantly
improved soil organic C contents, but the type and source of inputs
had different impacts. Tensile strength of aggregates decreased and
friability increased through organic inputs, with a maximum effect
under green gram residue (rice)-farmyard manure (wheat) substitution.
Higher macroaggregates in the crop residue- and farmyard
manure-treated soils resulted in a higher aggregate mean weight
diameter, which also had higher soil organic C contents. The bulk
soil organic C had a strong relation with the mean weight diameter
of aggregates, but the soil organic C content in all aggregate fractions
was not necessarily effective for aggregate stability. The soil
organic C content in large macroaggregates (2-8 mm) had a significant
positive effect on aggregate stability, although a reverse
effect was observed for aggregates <0.25 mm. Partial substitution
of nitrogen by organic substrates improved aggregate properties and
the soil organic C content in bulk soil and aggregate fractions,
although the relative effect varied with the source and amount of
the organic inputs.
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