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A Spatially Variable Management System for the Application of Fertilizer for the Production of Winter Wheat in the Palouse
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Abstract
A procedure for developing a GIS database for a Palouse wheat field is described and a case study used for an example. The database and standard fertilizer rate formulas based on potential yield were combined with an expert system to develop a fertilizer rate database for each of 200 cells in a 32 hectare field. GPS instrumentation and a variable rate fertilizer applicator were used to apply the spatially variable fertilizer rate in the field. Average fertilizer applied was reduced from the farmer's anticipated 71 kg/ha to an average of 45 kg/ha for the variable rate. The fertilizer rate on slopes steeper than 20 percent averaged 33 kg/ha or a 54 percent reduction. The fertilizer cost was reduced by $7 per acre.
Authors
Citation
Peterson, C., He, B., Shropshire, G., and Fisher, K., "A Spatially Variable Management System for the Application of Fertilizer for the Production of Winter Wheat in the Palouse," SAE Technical Paper 932423, 1993, https://doi.org/10.4271/932423.Also In
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