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Effects of crop rotation and sheep grazing management on the seedbank and emerged weed flora under a no-tillage integrated crop-livestock system

  • M. Z. Schuster (a1), S. K. Harrison (a2), A. de Moraes (a1), R. M. Sulc (a2), P. C. F. Carvalho (a3), C. R. Lang (a1), I. Anghinoni (a4), S. B. C. Lustosa (a5) and F. Gastal (a6)...

Abstract

Effective integrated weed management in agricultural landscapes depends on the ability to identify and manage processes that drive weed dynamics. The current study reports the effects of grazing management and crop rotation strategies on the seedbank and emerged weed flora in an integrated crop-livestock system (ICLS) experiment during a 12-year period under no-tillage in sub-tropical southern Brazil. During winter, Italian ryegrass cover crops were grazed by sheep: grazing management treatments included two stocking methods (continuous and rotational) and two forage allowances (10 and 20 kg of herbage dry matter available per 100 kg animal live weight). During summer, the crop rotation treatments involved either soybean-maize or soybean-soybean in succession with winter-grazed cover crops. The treatments were part of a factorial randomized complete block design. Treatment effects were evaluated on the weed seedbank and emerged weed flora populations during winter-grazed cover crop and summer crop growth as well as during the harvest phase. The current results demonstrate that crop rotation and grazing management exhibited interactive effects on the determination of weed outcomes in an ICLS. However, overall, compared with moderate forage allowance, high forage allowance during the winter-grazed cover crop caused lower emerged weed flora in subsequent crops (20% reduction during crop growth and 90% reduction at crop harvest) and 48% reduction in seedbank size. High forage allowance promoted more residue from winter-grazed cover crop biomass, which remained during the summer crop phases and probably resulted in a physical barrier to weed emergence.

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Corresponding author

Author for correspondence: M. Z. Schuster, E-mail: mauricioschus@gmail.com

References

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Keywords

Effects of crop rotation and sheep grazing management on the seedbank and emerged weed flora under a no-tillage integrated crop-livestock system

  • M. Z. Schuster (a1), S. K. Harrison (a2), A. de Moraes (a1), R. M. Sulc (a2), P. C. F. Carvalho (a3), C. R. Lang (a1), I. Anghinoni (a4), S. B. C. Lustosa (a5) and F. Gastal (a6)...

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