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- W2074334603 abstract "Grid soil sampling is typically used for establishing management zones for site‐specific application of nutrients. The geostatistical procedures used to estimate values between sample locations require samples to be taken close enough to together that they are correlated to one another. An evaluation of the scale of variability of soil test P (STP), soil test K (STK), and soil pH for Ontario soils was conducted using autocorrelation analysis of 23 Ontario farm fields, which were grid‐sampled using a 30‐m spacing. The results of the autocorrelation analysis indicated that 13 of the 23 farm fields would require a grid spacing of less than 30 m to adequately assess their spatial variability. For only one site was the commonly used 100‐m grid spacing adequate for the assessment of the spatial patterns of STP and STK. Further analysis using F tests compared the residuals from three gridding procedures (kriging, inverse distance, and nearest neighbor) using 60‐ and 90‐m grid data to that of the residuals using the field mean soil test value. In most cases, soil test variation maps based on 60‐ or 90‐m grid soil samples did not result in an increased ability to predict the soil test level at a given location in the field. It was concluded that a grid spacing of 30 m or less would be required to adequately assess the spatial variation of STP, STK, and soil pH. Sampling at this intensity would require approximately 11 times as many soil samples as the commonly used 100‐m grid, which is likely to make the cost prohibitive." @default.
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- W2074334603 date "2005-03-01" @default.
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- W2074334603 title "Spatial Variability of Soil Test Phosphorus, Potassium, and pH of Ontario Soils" @default.
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- W2074334603 doi "https://doi.org/10.2134/agronj2005.0524" @default.
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