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Nitrogen fertilizer increased litter deposition and litter N in warm-climate grasslands

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Abstract

In warm-climate grasslands, litter deposition and decomposition are one of the main pathway of nutrient cycling. The application of nitrogen (N) fertilizer or the inclusion of a legume in such grasslands modifies litter characteristics and chemical composition. This study evaluated how the N supply of palisadegrass [Urochloa brizantha (Hochst. ex A. Rich.) R.D. Webster] pastures affect litter characteristics two years after seeding. Treatments were palisadegrass fertilized or not with N (150 or 0 kg N ha−1 year−1) or mixed with the legume forage peanut (Arachis pintoi cv. Amarillo). The experimental period covered two consecutive rainy seasons. Nitrogen fertilization increased by 43 and 62% the existing litter mass (organic matter, OM), and by 32 and 23% the litter deposition rate compared to unfertilized palisadegrass or legume-grass mixtures, respectively. Both variables were affected by grazing cycle (GC), with low litter deposition rate (14 kg ha−1 d−1 OM) and existing litter mass (1390 kg ha−1 OM) in the GC4 due to low rainfall. Nitrogen fertilized palisadegrass had greater litter N concentration (7.9 ± 0.4 g kg−1 OM—C:N ratio 34 ± 2) than in monoculture or legume-grass mixtures (C:N ratios 45 and 58 ± 2, respectively). Our results indicated that N fertilization of palisadegrass increased litter accumulation, however, N fertilization was not a key driver of the litter decomposition rate, even though it increased litter N concentration. After 2 years of establishment, the proportion of forage peanut in the litter was still low, reducing the benefits of legume inclusion to enhance litter nutrient cycling in these pastures.

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Acknowledgements

The authors thank the members of UnespFOR (Brazilian forage Team) for the contributions during the field trial setup. The authors acknowledge the São Paulo Research Foundation (FAPESP, Grants 2016/11086-1, 2017/11274-5 and thematic Grants 2015/16631-5), the Coordination of Improvement of Higher Education Personnel (CAPES), the National Council for Scientific and Technological Development (CNPq, Grant 404169/2013-9) by financial support, and a grant “Cientista de Nosso Estado” for author RMB a postdoctoral fellowship for INOC both from the Rio de Janeiro State Research Foundation (FAPERJ).

Funding

The authors were supported by the São Paulo Research Foundation (FAPESP, Grants 2016/11086-1, 2017/11274-5, and thematic Grant 2015/16631-5), the National Council for Scientific and Technological Development (CNPq, Grant 404169/2013-9) for financial support, and a grant “Cientista de Nosso Estado” for author RMB and a postdoctoral fellowship for INOC both from the Rio de Janeiro State Research Foundation (FAPERJ).

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Correspondence to Vanessa Z. Longhini.

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Longhini, V.Z., Cardoso, A.S., Berça, A.S. et al. Nitrogen fertilizer increased litter deposition and litter N in warm-climate grasslands. Nutr Cycl Agroecosyst 119, 247–258 (2021). https://doi.org/10.1007/s10705-021-10119-8

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  • DOI: https://doi.org/10.1007/s10705-021-10119-8

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