Effects of Lime Particle Size and Distribution and Fertilizer Formulation on Clubroot Disease Caused byPlasmodiophora brassicae

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Abstract
Variables that can influence the effectiveness of lime, such as the degree of mixing lime with soil, the fineness of limestone, and the residual basicity or acidity of N sources in the rhizosphere were evaluated. Thorough mixing of limed soil resulted in a more uniform pH distribution; the pH from one 0.5-g soil microsample to another varied as much as 2 pH units when not thoroughly mixed to as little as 0.2 pH units when thoroughly mixed. This variation in soil pH was not evident using 15-g soil macrosamples. Control [of clubroot in Chinese cabbage] was consistently best using thoroughly mixed limed soils in both greenhouse and field trials. Control also improved with decreased particle size of limestone and with use of Ca(NO3)2, a fertilizer reported to induce a residual basic reaction in the rhizosphere.