International Journal of Soil Science1816-4978xxxx-xxxxAcademic Journals Inc.10.3923/ijss.2010.1.10HandayaniI.P. CoyneM.S. TokoshR.S. 1201051The study was conducted to evaluate the influences of
tall fescue management on soil organic matter fractions and macro- and
microaggregate distribution. Soil samples were collected from four paired
adjacent fields consisting of five years of tall fescue mono and poly
stands in Western Kentucky. Soil samples from 0 to 15 cm and 15 to 30
cm soil depths were analyzed for soil organic C and N, particulate organic
matter C (POM-C) and N (POM-N), macro- and micro aggregate distribution
and C-associated with macro- and micro- aggregates. Significant effects
were observed between stands for all the properties, except total C, microaggregates
and C-associated with microaggregates. Sampling depth significantly influenced
total C and N in both stands. Particulate organic matter C and N and C-associated
with macroaggregates and the amount of macroaggregates were strongly affected
by tall fescue management. This confirmed the hypothesis that early changes
in soil properties were reflected in labile C and N fractions and soil
structure. Tall fescue mixture stands had 44% higher POM-C, 50% higher
POM-N, 26% more macroaggregates and 33% more C-associated with macroaggregates
compared to the tall fescue mono stands at the soil surface of 0 to 15
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