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Parameterization of the APSIM model for simulating palisadegrass growth under continuous stocking in monoculture and in a silvopastoral system

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  • Gomes, Fagner Junior
  • Bosi, Cristiam
  • Pedreira, Bruno Carneiro
  • Santos, Patrícia Menezes
  • Pedreira, Carlos Guilherme Silveira

Abstract

Sustainable intensification of livestock production systems has become a global demand. In silvopastoral systems, contrasting shading levels caused by the presence of trees interferes in the productive responses of the pasture under grazing. The environment in which plants develop in a pasture canopy is dynamic and complex due to the nature of soil-plant-animal interactions. These dynamic aspects can be rationalized, evaluated, and explained using mathematical modeling. The objective of the present study was to parameterize the APSIM-Tropical Pasture model to simulate palisadegrass [Brachiaria brizantha (Hochst A Rich) Stapf, syn. Urochloa brizantha] growth under continuous stocking and variable stocking rate, in a full sun system and in contrasting shading conditions of a silvopastoral setting with eucalyptus (Eucalyptus grandis W. Hill ex Maiden × Eucalyptus urophylla S. T. Blake). Trees were planted in triple-row groves, with three groves per 2-ha silvopasture area. The spacing between groves was 30 m, and tree density was 135 ha−1, in East-West orientation. The data used to calibrate and validate the model were collected in a 36-month experiment with full sun and shade treatments of the silvopastoral setting in Sinop, MT, Brazil. Live forage mass estimates had coefficient of determination varying between 0.76 and 0.94, Willmott agreement index ranged from 0.93 to 0.96, and root mean square error between 275 and 610 kg DM ha−1. The APSIM-Tropical Pasture model can simulate Marandu palisadegrass growth under continuous stocking with variable stocking rate, but improvements are needed to better simulate the effect of N fertilizations in different periods on growth. The model can simulate pasture growth under shading levels but our simulations did not consider competition for soil moisture, which should be considered in the future, since it can be an important factor for other silvopastoral designs or microclimatic conditions.

Suggested Citation

  • Gomes, Fagner Junior & Bosi, Cristiam & Pedreira, Bruno Carneiro & Santos, Patrícia Menezes & Pedreira, Carlos Guilherme Silveira, 2020. "Parameterization of the APSIM model for simulating palisadegrass growth under continuous stocking in monoculture and in a silvopastoral system," Agricultural Systems, Elsevier, vol. 184(C).
    • Handle: RePEc:eee:agisys:v:184:y:2020:i:c:s0308521x20302419
    DOI: 10.1016/j.agsy.2020.102876
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    References listed on IDEAS

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    1. Piñeiro, Gervasio & Perelman, Susana & Guerschman, Juan P. & Paruelo, José M., 2008. "How to evaluate models: Observed vs. predicted or predicted vs. observed?," Ecological Modelling, Elsevier, vol. 216(3), pages 316-322.
    2. Bosi, Cristiam & Sentelhas, Paulo Cesar & Pezzopane, José Ricardo Macedo & Santos, Patricia Menezes, 2020. "CROPGRO-Perennial Forage model parameterization for simulating Piatã palisade grass growth in monoculture and in a silvopastoral system," Agricultural Systems, Elsevier, vol. 177(C).
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    1. Vieira Junior, Nilson Aparecido & Evers, Jochem & dos Santos Vianna, Murilo & Pedreira, Bruno Carneiro e & Pezzopane, José Ricardo Macedo & Marin, Fábio Ricardo, 2022. "Understanding the arrangement of Eucalyptus-Marandu palisade grass silvopastoral systems in Brazil," Agricultural Systems, Elsevier, vol. 196(C).
    2. Bosi, Cristiam & Huth, Neil Ian & Sentelhas, Paulo Cesar & Pezzopane, José Ricardo Macedo, 2022. "APSIM model performance in simulating Piatã palisade grass growth and soil water in different positions of a silvopastoral system with eucalyptus," Agricultural Systems, Elsevier, vol. 195(C).
    3. Al Mamun, Mohammad Abdullah & Garba, Ismail Ibrahim & Campbell, Shane & Dargusch, Paul & deVoil, Peter & Aziz, Ammar Abdul, 2023. "Biomass production of a sub-tropical grass under different photovoltaic installations using different grazing strategies," Agricultural Systems, Elsevier, vol. 208(C).

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