Abstract
The USDA-Agricultural Research Service and Colorado State University are conducting an interdisciplinary study that focuses on developing a clearer scientific understanding of the causes of yield variability. Two years of data have been collected from two commercial center pivot irrigated fields (72 and 52 ha). Cooperating farmers manage all farming operations for crop production and provide yield maps of the maize grown on the fields. The farmers apply sufficient inputs to minimize risk of yield loss. The important variables for crop production have been sampled at a grid spacing of 76 m for two seasons. A spatial auto-regressive model was fitted to the data to determine the critical factors affecting yield variability. Thirty one layers of data were included in the analysis, and a total of over 140,000 models were examined. Up to five predictors were used in each model. Variability in water application, nitrate nitrogen, organic matter, phosphorus, topology, percent silt and soil electrical conductivity were significant in explaining the yield variability for Field 1. Variability in water application, ammonium, nematodes, percent clay, insects, potassium, soil electrical conductivity, and topology were significant in explaining the yield variability for Field 2. The tentative conclusion is that the potential economic benefit of site specific management is small where the farmer's management tolerance for risk is low. The potential of site specific management is in reducing the cost of inputs and environmental impact, but could increase risk.
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Buchleiter, G. W., Bausch, W. C., Duke, H. R. and Heermann, D. F. 1997. Multidisciplinary approach for precision farming. In: '97, Proceedings of the 1st European Conference on Precision Agriculutre, vol. I: Spatial Variability in Soil and Crop, edited by J. V. Stafford (BIOS Scientific Publishers, Oxford, UK,), p. 351–359.
Bullock, D. S. 1999. The economics of precision farming: A primer for agronomists designing experiments. In: Proceedings of the 2nd European Conference on Precision Agriculture, edited by J. V. Stafford (Sheffield Academic Press, UK), p. 937–946.
Burnham, K. P. and Anderson, D. R. 1998. Model Selection and Inference: A Practical Information-Theoretic Approach (Springer-Verlag, New York), p. 17–20.
Coble, H. D. 1986. Development and implementation of economic thresholds for soybean. In: CIPM: Integrated Pest Management in Major Agricultural Systems, edited by R. E. Frisbies and P. L. Adkisson (Texas A&M University, USA), p. 295–307.
Fleming, K. L., Heermann, D. F., Westfall, D. G., Bosley, D. B., Peairs, F. B. and Westra, P. 1998. Precision farming—from technology to decisions: A case study. In: Proceedings of Fourth International Conference on Precision Agriculture, edited by P. C. Robert, R. H. Rust, and W. E. Larson (ASA, CSSA, SSSA, Madison, WI, USA), p. 1777–1783.
Fleming, K. L., Westfall, D. G. and Heermann, D. F. 1999. Farmer developed management zone maps for variable rate fertilizer application. In: Proceedings of the 2nd European Conference on Precision Agriculture, edited by J. V. Stafford (Sheffield Academic Press, UK), p. 917–926.
Heermann, D. F., Hoeting, J., Duke, H. R., Westfall, D. G., Buchleiter, G. W., Westra, P., Peairs, F. B. and Flemimg, K. L. 1999. Interdisciplinary irrigated precision farming research. In: Proceedings of the 2nd European Conference on Precision Agriculture, edited by J. V. Stafford (Sheffield Academic Press, UK), p. 121–130.
Hurvich, C. M., and Tsai, C.-L. 1989. Regression and time series model selection in small samples. Biometrika 76, 297–307.
Jordan, R. W., Duke, H. R. and Heermann, D. F. 1998. Spatial variability of water application from center pivot irrigation and precipitation. In: Proceedings of the Fourth International Conference on Precision Agriculture, edited by P. C. Robert, R. H. Rust, and W. E. Larson (ASA, CSSA, SSSA, Madison, WI, USA), p. 1001–1010.
Jordan, R. W., Duke, H. R., Heermann, D. F. and Buchleiter, G. W. 1999. Spatial variability of water application and percolation under center pivot irrigation. In: Proceedings of the 2nd European Conference on Precision Agriculture, edited by J. V. Stafford (Sheffield Academic Press, UK), p. 739–748.
McBratney, A. B. and Pringle, M. J. 1997. "Spatial variability in soil—implications for precision agriculture. In: '97, Proceedings of the 1st European Conference on Precision Agricluture, Vol. I: Spatial Variability in Soil and Crop, edited by J. V. Stafford (BIOS Scientific Publishers, Oxford, UK), p. 3–31.
Morton, T. W., Buchleiter, G. W. and Heermann, D. F. 1998. Quantifying the effect of water availability on corn yield under a center pivot irrigation system. In: Proceedings of the Fourth International Conference on Precision Agriculture, edited by P. C. Robert, R. H. Rust, and W. E. Larson (ASA, CSSA, SSSA, Madison, WI, USA), p. 31–41.
National Research Council, 1997. Precision Agriculture in the 21st Century, Geospatial and Information Technologies in Crop Management (National Academy Press: Washington, DC, USA) p. 149.
Sudduth, K. A., Drummond, S. T., Birrell, S. J. and Kitchen, N. R. 1996. Analysis of spatial factors influencing crop yield. In: Proceedings of the Third International Conference on Precision Agriculture, edited by P. C. Robert, R. H. Rust, and W. E. Larson (ASA, CSSA, SSSA, Madison, WI, USA), p. 129–140.
Upton, G., and Fingleton, B. 1985. Spatial Data Analysis by Example; Vol. 1: Point Pattern and Quantitative Data (Wiley, New York).
Vanden Heuvel, R. M. 1996. The promise of precision agriculture. Journal of Soil and Water Conservation 51, 38–40.
Weisberg, S. 1985. Applied Linear Regression (Wiley, New York), p. 42.
Wyse-Pester, D. Y., Wiles, L. J. and Westra, P. 1998. Spatial sampling for crop pests in two center pivot irrigated fields. In: Proceedings of the Fourth International Conference on Precision Agriculture, edited by P. C. Robert, R. H. Rust, and W. E. Larson (ASA, CSSA, SSSA, Madison, WI, USA), p. 511–52.
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Heermann, D.F., Hoeting, J., Thompson, S.E. et al. Interdisciplinary Irrigated Precision Farming Research. Precision Agriculture 3, 47–61 (2002). https://doi.org/10.1023/A:1013374120356
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DOI: https://doi.org/10.1023/A:1013374120356