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Managing Phosphorous Soil Dynamics Over Space And Time

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  • Lambert, Dayton M.
  • Lowenberg-DeBoer, James
  • Malzer, Gary L.
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    Abstract

    Understanding the relationship between soil fertility dynamics and crop response is conceptually appealing. Even more appealing is comprehension of the spatial and temporal heterogeneity of these connections over a production surface and across seasons. Knowledge of these interactions is complicated because nutrient carryover dynamics and crop response to inputs are determined simultaneously on the one-hand, and sequentially on the other. A second problem enters when crops are rotated, for example, in the corn-soybean system commonly practiced in the Corn Belt. This paper examines the nutrient carryover-crop response nexus using data from a corn-soybean, variable-rate nitrogen (N) and phosphorous (P) experiment conducted over five years. Site-specific corn response to N and P and soybean response to P are simultaneously estimated with a P carryover equation. These estimates are used in a dynamic programming model to map site-specific optimal N and P fertilizer policies, soil P evolution, and profitability. The net present value of managing N and P site-specifically is compared to a strategy where these inputs are managed uniformly following extension guidelines. The results suggest that when P-carryover is managed, site-specific returns to the variable-rate strategies are higher than returns to a conventional, uniform strategy.

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    File URL: http://purl.umn.edu/19452
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    Bibliographic Info

    Paper provided by American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association) in its series 2005 Annual meeting, July 24-27, Providence, RI with number 19452.

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    Date of creation: 2005
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    Handle: RePEc:ags:aaea05:19452

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    Keywords: Crop Production/Industries;

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    1. Léonard,Daniel & Long,Ngo van, 1992. "Optimal Control Theory and Static Optimization in Economics," Cambridge Books, Cambridge University Press, number 9780521331586.
    2. Kennedy, John O.S. & Whan, Ian F. & Jackson, R. & Dillon, John L., 1973. "Optimal Fertilizer Carryover And Crop Recycling Policies For A Tropical Grain Crop," Australian Journal of Agricultural Economics, Australian Agricultural and Resource Economics Society, vol. 17(02), August.
    3. Bullock, David S. & Lowenberg-DeBoer, Jess & Swinton, Scott M., 2002. "Adding value to spatially managed inputs by understanding site-specific yield response," Agricultural Economics: The Journal of the International Association of Agricultural Economists, International Association of Agricultural Economists, vol. 27(3), November.
    4. Linda Whipker & jay Akridge, 2006. "2006 Precision Agricultural Services Dealership Survey Results," Working Papers 06-10, Purdue University, College of Agriculture, Department of Agricultural Economics.
    5. Alban Thomas, 2003. "A dynamic model of on-farm integrated nitrogen management," European Review of Agricultural Economics, Foundation for the European Review of Agricultural Economics, vol. 30(4), pages 439-460, December.
    6. John O.S. Kennedy & I.F. Whan & R. Jackson & John L. Dillon, 1973. "Optimal Fertilizer Carryover And Crop Recycling Policies For A Tropical Grain Crop," Australian Journal of Agricultural and Resource Economics, Australian Agricultural and Resource Economics Society, vol. 17(2), pages 104-113, 08.
    7. Luc Anselin & Rodolfo Bongiovanni & Jess Lowenberg-DeBoer, 2004. "A Spatial Econometric Approach to the Economics of Site-Specific Nitrogen Management in Corn Production," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 86(3), pages 675-687.
    8. Bullock, David S. & Lowenberg-DeBoer, Jess & Swinton, Scott M., 2002. "Adding value to spatially managed inputs by understanding site-specific yield response," Agricultural Economics, Blackwell, vol. 27(3), pages 233-245, November.
    9. Chavas, Jean-Paul, 1999. "On Dynamic Arbitrage Pricing and Information: The Case of the US Broiler Sector," European Review of Agricultural Economics, Foundation for the European Review of Agricultural Economics, vol. 26(4), pages 493-510, December.
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