Relative effects of calcium and acidity of the soil on the occurrence of potato scab

Blodgett, F. M.; Cowan, E. K.

doi:10.1007/bf02890822

Cited by 8 publications

(5 citation statements)

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“…By contrast, in the three seasons in which scab was a problem, increasing the soil pH to 8.5 or preferably 9.0 significantly reduced both the incidence and severity of common scab. The threshold soil pH values for scab control derived from this field study correspond with the thresholds observed in pot studies by Blodgett and Cowan (1935). As increasing the soil pH reduced grade-out to scab without detrimentally affecting yields, marketable yields increased with soil pH (Table 2).…”

Section: Resultssupporting

confidence: 77%

“…These results suggest that management practices that increase the soil pH to 9.0 pose relatively little threat to potato yields under the conditions and management practices common in western Canada and the United States. Blodgett and Cowan (1935) also noted little impact of increasing soil pH through to 9.0, but yields declined rapidly at higher pH levels.…”

Section: Resultsmentioning

confidence: 95%

“…The optimum pH range commonly reported for potatoes is 5.5 to 7.5 (Smith 1940), with higher pH levels causing significant yield reductions in some cases (Odland and Albritton 1950) and little effect in others (Blodgett and Cowan 1935). The yield decline associated with high pH levels is usually attributed to pH-related deficiencies of P Can.…”

Section: Resultsmentioning

confidence: 99%

“…Averaged over the 3 test years in which scab was a significant problem, yields after grade-out to excessive scab at soil pH 9.0 were 22% higher than at the native pH of 8.0. Even greater benefits might be expected with more-sensitive cultivars or where growing conditions and management practices were more conducive to scab (Blodgett and Cowan 1935).…”

Section: Resultsmentioning

confidence: 99%

“…Surveys of potato fields in New York showed that the incidence of scab was either unchanged or decreased as the soil pH increased above 7.0 (Blodgett and Howe 1934). In a pot study, Blodgett and Cowan (1935) demonstrated that liming a soil from its original pH of 7.0 through to 9.0 decreased the incidence of scab from 80% down to 10%. The concept of using high soil pH levels to control common scab is complicated by the impact that high soil pH levels may have on the productivity of both the potato crop and subsequent crops in the rotation.…”

mentioning

confidence: 99%

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Impact of high soil pH on potato yields and grade losses to common scab

Waterer¹

2002

Can. J. Plant Sci.

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Waterer, D. 2002. Impact of high soil pH on potato yields and grade losses to common scab. Can. J. Plant Sci. 82: 583-586. The influence of soil pH on yields and grade-out due to tuber damage by common scab (Streptomyces scabies) was evaluated over multiple cropping seasons for potato (Solanum tuberosum) grown on land heavily infested with S. scabies. Soils with a native pH of 8.0 were adjusted to pH 7.0 to 9.0 using elemental sulfur as an acidulant and calcitic lime as the liming agent. There was little change in total tuber yields over this pH range, but the incidence and severity of scab lesions declined as the pH increased above 8.5. Marketable yields after grade-out to scab were highest at pH 9.0. This study demonstrates that in alkaline soils losses due to potato common scab may be managed by adjusting the soil pH to a point unfavorable to the scab organism. The economics of this type of pH change and its impact on subsequent crops need to be considered. . L'auteur a évalué l'incidence du pH du sol sur le rendement de la pomme de terre (Solanum tuberosum) et le nombre de tubercules rejetés à cause de la gale commune (Streptomyces scabies). L'étude s'est déroulée sur plusieurs années dans un sol très infesté par le microorganisme. On a ajouté du soufre élémentaire comme acidifiant et du calcaire calcitique comme agent de chaulage au sol d'un pH naturel de 8,0 afin que le pH se situe entre 7,0 et 9,0. Le rendement total en tubercules a relativement peu changé avec la modification du pH, mais l'incidence et la gravité des lésions dues à la gale diminuent dès que le pH dépasse 8,5. Le meilleur rendement commercialisable après écart de triage a été observé à pH 9,0. L'étude révèle qu'on peut réduire les pertes de tubercules résultant de la gale commune dans les sols alcalins en corrigeant le pH jusqu'à un niveau que ne peut tolérer le microorganisme. Auparavant cependant, on devra tenir compte des paramètres économiques associés à la modification du pH et des conséquences de cette pratique sur les cultures ultérieures.

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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 95%