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Soil sampling and sensed ancillary data requirements for soil mapping in precision agriculture II: contour mapping of soil properties with sensed z-score data for comparison with management zone averages

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Abstract

Sensed and soil sample data are used in two approaches for mapping soil properties in precision agriculture: management zone (MZs) and contour maps. This is the second paper in a two-part series that focuses on contour maps. Detailed and accurate contour maps of soil properties for precision agriculture are often costly to produce because of the large sampling effort required. Such maps or those of sensed ancillary data are often simplified to represent MZs. This research investigated the accuracy of detailed maps of soil properties produced inexpensively from sensed data by transforming them to z-scores. The z-scores of ancillary values are then transformed to values of soil variables using the mean and standard deviation of a small soil data set. The errors from this mapping approach are examined with historic soil data from three field sites with different scales of spatial variation in the United Kingdom. Errors from the conversion of z-scores of sensed data to soil variable ranges are compared with those from MZ averages (Paper I in this series). For soil properties with a moderate relation to ancillary data, the errors related to the z-score conversion were small irrespective of sample size. The root mean squared errors associated with the MZ mean rather than values from the digital map were generally smaller except when sample size was very small. The results suggest that when the scale of variation is small and more samples are required to define MZs, calibrating z-scores of sensed ancillary data may provide better MZ averages than sampling on a grid; it also provides a detailed map of spatial variation within the field. The z-score conversion approach is less sensitive to sample size and captures small features of the variation compared to the standard 100 m grid sampling to determine MZ averages.

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Data availability

The data used in this study are not publically available but interested parties contact the corresponding author to discuss data availability.

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Acknowledgements

The data used in this study were collected as part of research previously funded by the University of Reading, The Home Grown Cereals Authority (HGCA) and the Fertiliser Manufacturer’s Association (FMA). Chris Dawson and Associates collected the 1989 soil survey data for the Wallingford Site and SOYL ltd collected the data for the 1994 survey of the Wallingford site and collected ECa data at all sites. We thank Peter King of Yattendon Estates, Berkshire, UK and Philip Chamberlain of Crowmarsh Battle Farms, Oxfordshire, UK for allowing us to do fieldwork on their farms.

Funding

Funding was provided by Home-Grown Cereals Authority, University of Reading and Fertiliser Manufacturers Association.

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Authors and Affiliations

  1. Department of Geography, Brigham Young University, Provo, UT, USA

    Ruth Kerry

  2. School of Water, Energy and Environment, Cranfield University, Cranfield, UK

    Ben Ingram

  3. Department of Geography and Environmental Science, Reading University, Reading, UK

    Margaret Oliver

  4. Scottish Water, Fairmilehead Office, Edinburgh, UK

    Zoë Frogbrook

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  1. Ruth Kerry
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  2. Ben Ingram
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  4. Zoë Frogbrook
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Correspondence to Ruth Kerry.

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Kerry, R., Ingram, B., Oliver, M. et al. Soil sampling and sensed ancillary data requirements for soil mapping in precision agriculture II: contour mapping of soil properties with sensed z-score data for comparison with management zone averages. Precision Agric 25, 1212–1234 (2024). https://doi.org/10.1007/s11119-023-10108-7

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