Abstract
Long-term integrated crop-livestock system enables constant and more efficient nutrient cycling because animal, pasture and crop residues release nutrients at different rates. Therefore, appropriate management of these systems is needed to maximize benefits from nutrient cycling. The objective of this study was to evaluate how grazing intensity affected the release rates of phosphorus (P) and potassium (K) in pasture, dung and soybean residues in a no-till long-term integrated crop-livestock system. The experiment was established in 2001 on a clayey Oxisol after soybean harvest. Treatments consisted of pasture with sward heights maintained at 1020, 30 and 40 cm by different cattle stocking rates and a non-grazed (NG) treatment. Decomposition and release rates of nutrients in the pasture and dung were determined using litter bags, which were installed at soybean seeding and pasture seeding during two pasture-crop cycles (2009–2011). Lighter grazing intensities resulted in greater P release rate from pasture and dung residues. Pasture and dung residues released K at a very high rate and were not influenced by grazing intensity. The P and K released from soybean residue were not affected by grazing intensity; however, decomposition of soybean leaves was greater than of stems. Greatest rates of total P and K released were from pasture and dung residues under lighter grazing intensities and in the NG areas. Large amounts of P (~25 kg ha−1) and K (~130–180 kg ha−1) were cycled in a complete soybean-beef cattle integrated system and must be considered in the fertilization management.
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Acknowledgements
We would like to thank Adao Luis Ramos dos Santos for the support provided in the laboratorial analysis and field activities. We also thank the National Council for the Development of Science and Technology (CNPq) and the Coordination for the Improvement of Higher Education Personnel (CAPES) for financial and scholarship support.
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Assmann, J.M., Martins, A.P., Anghinoni, I. et al. Phosphorus and potassium cycling in a long-term no-till integrated soybean-beef cattle production system under different grazing intensities insubtropics. Nutr Cycl Agroecosyst 108, 21–33 (2017). https://doi.org/10.1007/s10705-016-9818-6
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DOI: https://doi.org/10.1007/s10705-016-9818-6