Sulfur and certain soil amendments for potato scab control in the peat soils of northern Iowa

Early‐Season Applications of Sulfur Fertilizers Increase Potato Yield and Reduce Tuber Defects

“…There was no S effect when these materials were applied PE. Since these trials were conducted on alkaline soils (pH 7.8–8.1) and these low rates were effective except at PE, the data suggest that the S effect is not due to a lowering of the pH (Hooker and Kent, 1950). However, the mode of action of S in reducing common scab and black scurf may not be altogether clear.…”

“…The reduction of common scab, at least with IF application, is due to the S in the sulfate ion and the thiosulfate ion as the ammonium ion is not effective (Hooker and Kent, 1950). Additional evidence suggesting that the sulfate ion is effective in promoting potato yield and reducing tuber disease incidence is suggested from reports on the application of heavy metal ions such as Mn (Mortvedt et al, 1963).…”

“…Ammonium sulfate would be used in lower amounts, be a source of N, and fit into a fertilizer management scheme. Working with cultivar Irish Cobbler on slightly acid soils, Hooker and Kent (1950) reported that AS applied IF at rates resulting in 134 and 268 kg S ha −1 increased total and marketable yields and reduced the incidence of common scab. Reporting preliminary data on the cultivar Atlantic on acidic soil, Hammerschmidt and Vitosh (1987) reported yield increases and reduction in common scab with AS applied at 128 kg S ha −1 both IF plus early PE.…”

Early‐Season Applications of Sulfur Fertilizers Increase Potato Yield and Reduce Tuber Defects

“…There was no S effect when these materials were applied PE. Since these trials were conducted on alkaline soils (pH 7.8–8.1) and these low rates were effective except at PE, the data suggest that the S effect is not due to a lowering of the pH (Hooker and Kent, 1950). However, the mode of action of S in reducing common scab and black scurf may not be altogether clear.…”

“…The reduction of common scab, at least with IF application, is due to the S in the sulfate ion and the thiosulfate ion as the ammonium ion is not effective (Hooker and Kent, 1950). Additional evidence suggesting that the sulfate ion is effective in promoting potato yield and reducing tuber disease incidence is suggested from reports on the application of heavy metal ions such as Mn (Mortvedt et al, 1963).…”

“…Ammonium sulfate would be used in lower amounts, be a source of N, and fit into a fertilizer management scheme. Working with cultivar Irish Cobbler on slightly acid soils, Hooker and Kent (1950) reported that AS applied IF at rates resulting in 134 and 268 kg S ha −1 increased total and marketable yields and reduced the incidence of common scab. Reporting preliminary data on the cultivar Atlantic on acidic soil, Hammerschmidt and Vitosh (1987) reported yield increases and reduction in common scab with AS applied at 128 kg S ha −1 both IF plus early PE.…”

Early‐Season Applications of Sulfur Fertilizers Increase Potato Yield and Reduce Tuber Defects

“…There was no S effect when these materials were applied PE. Since these trials were conducted on alkaline soils (pH 7.8–8.1) and these low rates were effective except at PE, the data suggest that the S effect is not due to a lowering of the pH (Hooker and Kent, 1950). However, the mode of action of S in reducing common scab and black scurf may not be altogether clear.…”

“…The reduction of common scab, at least with IF application, is due to the S in the sulfate ion and the thiosulfate ion as the ammonium ion is not effective (Hooker and Kent, 1950). Additional evidence suggesting that the sulfate ion is effective in promoting potato yield and reducing tuber disease incidence is suggested from reports on the application of heavy metal ions such as Mn (Mortvedt et al, 1963).…”

“…Ammonium sulfate would be used in lower amounts, be a source of N, and fit into a fertilizer management scheme. Working with cultivar Irish Cobbler on slightly acid soils, Hooker and Kent (1950) reported that AS applied IF at rates resulting in 134 and 268 kg S ha −1 increased total and marketable yields and reduced the incidence of common scab. Reporting preliminary data on the cultivar Atlantic on acidic soil, Hammerschmidt and Vitosh (1987) reported yield increases and reduction in common scab with AS applied at 128 kg S ha −1 both IF plus early PE.…”

Early‐Season Applications of Sulfur Fertilizers Increase Potato Yield and Reduce Tuber Defects

“…There was no S effect when these materials were applied PE. Since these trials were conducted on alkaline soils (pH 7.8–8.1) and these low rates were effective except at PE, the data suggest that the S effect is not due to a lowering of the pH (Hooker and Kent, 1950). However, the mode of action of S in reducing common scab and black scurf may not be altogether clear.…”

“…The reduction of common scab, at least with IF application, is due to the S in the sulfate ion and the thiosulfate ion as the ammonium ion is not effective (Hooker and Kent, 1950). Additional evidence suggesting that the sulfate ion is effective in promoting potato yield and reducing tuber disease incidence is suggested from reports on the application of heavy metal ions such as Mn (Mortvedt et al, 1963).…”

“…Ammonium sulfate would be used in lower amounts, be a source of N, and fit into a fertilizer management scheme. Working with cultivar Irish Cobbler on slightly acid soils, Hooker and Kent (1950) reported that AS applied IF at rates resulting in 134 and 268 kg S ha −1 increased total and marketable yields and reduced the incidence of common scab. Reporting preliminary data on the cultivar Atlantic on acidic soil, Hammerschmidt and Vitosh (1987) reported yield increases and reduction in common scab with AS applied at 128 kg S ha −1 both IF plus early PE.…”