Effect of fertilization method on the suppression of potato common scab in allophanic andosols
1997
Mizuno, N. (College of Dairying, Ebetsu, Hokkaido (Japan)) | Yoshida, H. | Ushiki, J. | Tadano, T.
The effect of fertilization method on the occurrence of potato scab was investigated in allophanic Andosols in the Iburi area of Hokkaido, Japan. At the flowering stage, the pH of the soil horizon where the potato tuber grows, was lower significantly in the treatment where ammonium sulfate was supplied in the rows and phosphate and potassium were supplied to all over the surface soil (group A(, and in the treatment where all fertilizers were supplied to all over the surface soil (group B) than that in the control treatment where all fertilizers were supplied in the rows. At the flowering stage, the pH was 4.5 in the control group, 4.3 in group A and 4.0 in group B. The occurrence of potato scab decreased both in groups A and B. The scab severity index was 82 in the control group, but 12 in group A and 4 in group B. The aluminum ion concentrations in the water extracts of the soils were between 0.3 and 0.8 mg L(-1) in soils with a pH lower than 4.5. Potato common scab was suppressed when the aluminum concentration in the water extract was higher than 0.3 mg L(-1)
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