Association of Potato Early Blight, Nitrogen Fertilizer Rate, and Potato Yield

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Abstract
The relationship between rate of N fertilizer application and potato yield was studied in the presence and absence of potato early blight caused by Alternaria solani. An analysis of the quadratic equation representing the response of yield to N fertilizer application indicated an optimum rate of 133 kg N/ha in the absence of potato early blight and 160 kg N/ha in its presence. Increased rates of N fertilizer application reduced the apparent infection rate and the final amount of early blight disease. Increased early blight severity was associated with decreased crop yields. Economic evaluation of the association of early blight severity, tuber yield and N fertilizer rate suggests that present recommendations for N fertilizer rates should be re-evaluated.

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