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Residual Soil Nitrate after Potato Harvest

Gilles Bélanger*,a, Noura Ziadia, John R. Walshb, John E. Richardsc and Paul H. Milburnd

a Agriculture and Agri-Food Canada, Soils and Crops Research and Development Centre, 2560 Hochelaga Boulevard, Sainte-Foy, Québec, Canada G1V 2J3
b McCain Foods Limited, 317 Main Street, Florenceville, New Brunswick, Canada E7L 3G6
c Agriculture and Agri-Food Canada, Atlantic Cool Climate Crops Research Centre, Brookfield Road, P.O. Box 39088, St-John's, Newfoundland, Canada A1E 5Y7
d Agriculture and Agri-Food Canada, Potato Research Centre, P.O. Box 20280, Fredericton, New Brunswick, Canada E3B 4Z7



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  		Fig. 1. Relationship between residual soil NO3–N content at 0 to 0.90 and 0 to 0.30 m under irrigated and nonirrigated conditions. Data points are for all N fertilizer applications at 10 sites.

 


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  		Fig. 2. Relationship between residual soil NO3–N content to a 0.90-m depth and the difference between N applied and the economically optimum nitrogen application (Nop) for marketable yield under irrigated and nonirrigated conditions. N0, N50, N100, and N250 refer to 0, 50, 100, and 250 kg N ha-1 before planting.

 




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