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Effects of lime particle size and distribution and fertilizer formulation on clubroot disease caused by plasmodiophora brassicae


Plant Disease 67(1): 50-52
Effects of lime particle size and distribution and fertilizer formulation on clubroot disease caused by plasmodiophora brassicae
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.


Accession: 005312071



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