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Spatial variability of soil properties and yield of a grazed alfalfa pasture in Brazil

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Abstract

Knowledge of the spatial variability of soil properties and of forage yield is needed for informed use of soil inputs such as variable rate technology (VRT) for lime and fertilizers. The objective of this research was to map and evaluate the spatial variability of soil properties, yield, lime and fertilizer needs and economic return of an alfalfa pasture. The study was conducted in a 5.3 ha irrigated alfalfa pasture in Sao Carlos, SP, Brazil that was directly grazed and intensively managed in a 270-paddock rotational system. Alfalfa shoot dry matter yield was evaluated before grazing. Soil samples were collected at 0–0.2 m depth, and each sample represented a group of 2 or 3 paddocks. Apparent soil electrical conductivity (ECa) was measured with a contact sensor. The cost of producing 1 ha of alfalfa was estimated from the amount of lime and fertilizer needed and was then used to estimate the total cost of production for the dairy system. The alfalfa dry matter yield was used to simulate the pasture stocking rate, milk yield, gross revenue and net profit. The spatial variability of soil properties and site-specific liming and fertilizer needs were modeled using semi-variograms with VESPER software, the soil fertility information and economic return were modeled with SPRING software. The results showed that geostatistics and GIS were effective tools for revealing soil and pasture spatial variability and supporting management strategies. Soil nutrients were used to classify the soil spatial distribution map and design site-specific lime and fertilizer application maps. Spatial variation in forage and spatial estimates of stocking and milk yield are adequate pasture management tools. Spatial analyses of needs, forage availability and economic return are management tools for avoiding economic problems, as well as potential environmental problems, caused by unbalanced nutrient supplies and over- or under-grazing.

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Acknowledgments

The International Potash Institute (IPI) provided funding for this research.

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Authors and Affiliations

  1. Embrapa Pecuária Sudeste, C.P. 339, São Carlos, SP, CEP: 13560-970, Brazil

    A. C. C. Bernardi, G. M. Bettiol & R. P. Ferreira

  2. USP, São Carlos, SP, Brazil

    K. E. L. Santos

  3. Embrapa Instrumentação, São Carlos, SP, Brazil

    L. M. Rabello & R. Y. Inamasu

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  1. A. C. C. Bernardi
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  2. G. M. Bettiol
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Correspondence to A. C. C. Bernardi.

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Bernardi, A.C.C., Bettiol, G.M., Ferreira, R.P. et al. Spatial variability of soil properties and yield of a grazed alfalfa pasture in Brazil. Precision Agric 17, 737–752 (2016). https://doi.org/10.1007/s11119-016-9446-9

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