Valdinei Tadeu Paulino, João Batista de Andrade, Erika Maria Celegato Teixeira, Keila Maria Roncato Duarte and Márcia Atauri Cardelli de Lucena
In integrated crop-livestock systems (ICLS), grain crop and pasture
development may affect the soil organic carbon stocks and chemical soil
fertility and help to renew degraded pastures, increasing land use efficiency
and endeavor income. Our objectives were to evaluate changes in the soil
chemical properties, carbon stock in soil and carbon stratification rates of a
typical Acrudox soil, with or without ICLS, liming and fertilization. The
systems studied integrated with maize were: (i) Urochloa brizantha cv.
Marandu (ICLS-Ub-Mar), (ii) U. brizantha
cv. Piatã (ICLS-Ub-Pia), and (iii) U.
ruziziensis ICLS-Ur) and (iv) U.
brizantha cv. Marandu (untreated control- UC) single without maize
intercropped. Experiment was performed at the Institute
of Animal Science in the municipality
of Nova Odessa, São Paulo
using a randomized blocks experimental design. ICLS increased the C stocks and
CSR that are good quality indicators of the sustainability of an agricultural
system. Higher values of CSR 1.7 were found in the
integrated crop-livestock systems with maize and ICLS-Ur. On the other hand,
without integrated-crop-livestock and no liming, no fertilization pasture of
Marandu palisade grass showed the lowest and above critical CSR=0.7. It is
interesting to highlight that the liming and fertilization in crops can
influence the soil chemical properties and improve the soil fertility (reduce
high acidity, aluminium saturation, increase exchangeable bases and C stocks),
and it promotes the higher forage accumulation and maize grains or silage.
Keywords: Carbon stock, integrated crop-livestock, soil fertility,
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