Abstract
Potatoes require high potassium (K) fertilization for good yields, especially in Oregon’s Columbia Basin, but little is known about how K rate and source affect potatoes. This study aimed to evaluate the effects of different K fertilizer rates and sources on the yield and quality of various potato cultivars. Two-year trials (2020 and 2022) were conducted as a split-plot, randomized complete block design with four replications in a producer’s field near Boardman, Oregon. The study tested two K fertilizer sources (potassium sulfate—K2SO4 and potassium chloride—KCl, at five application rates from 0 to 896 kg K2O ha−1, on three potato cultivars: Clearwater Russet, Russet Burbank, and Umatilla Russet. Among cultivars, Umatilla Russet, with 56.5 t ha−1, had the highest total yield. Potassium fertilizer application, regardless of the rate, significantly increased tuber yield, resulting in an average 10% increase in total yield and a 12% increase in US No. 1 yield compared to the control. Although total yield differences among K application rates from 224 to 896 kg K2O ha−1 were generally not significant, the linear-plateau model identified a breakpoint at 251 kg K2O ha−1, indicating that applying rates beyond this level does not result in a significant yield increase. Additionally, higher K application rates were linked to a reduction in tuber-specific gravity. In terms of K sources, both K2SO4 and KCl produced similar yields. Further studies in diverse environments are needed to better understand how K fertilization affects potato yield and quality and to develop best practices for maximizing productivity.
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Claims 8
Claim · model-written summary
Umatilla Russet had the highest total yield at 56.5 t per hectare.
- Taxon
- potato
Solanum tuberosumt0 - Material
- Umatilla Russete0
- Outcome
- total yielde0
- Direction
- higheste0
- Value
- 56.5 t ha−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Umatilla Russet, with 56.5 t ha−1, had the highest total yield.”
t0“Potato”
Claim · model-written summary
Potassium fertilization increased total tuber yield by 10% versus control.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Potassium fertilizer applicatione0
- Outcome
- total yielde0
- Direction
- increasee0
- Value
- 10%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium fertilizer application, regardless of the rate, significantly increased tuber yield, resulting in an average 10% increase in total yield and a 12% increase in US No. 1 yield compared to the control.”
t0“Potato”
Claim · model-written summary
Potassium fertilization increased US No. 1 yield by 12% versus control.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Potassium fertilizer applicatione0
- Outcome
- US No. 1 yielde0
- Direction
- increasee0
- Value
- 12%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium fertilizer application, regardless of the rate, significantly increased tuber yield, resulting in an average 10% increase in total yield and a 12% increase in US No. 1 yield compared to the control.”
t0“Potato”
Claim · model-written summary
Total yield did not differ significantly among potassium rates from 224 to 896 kg K2O per hectare.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- K application rates from 224 to 896 kg K2O ha−1e0
- Outcome
- total yield differencese0
- Comparator
- among K application ratese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total yield differences among K application rates from 224 to 896 kg K2O ha−1 were generally not significant”
t0“Potato”
Claim · model-written summary
The yield response model identified a 251 kg K2O per hectare breakpoint.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- breakpointe0
- Value
- 251 kg K2O ha−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the linear-plateau model identified a breakpoint at 251 kg K2O ha−1”
t0“Potato”
Claim · model-written summary
The model indicated no significant yield increase above the breakpoint.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- applying rates beyond this levele0
- Outcome
- yield increasee0
- Direction
- does not resulte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying rates beyond this level does not result in a significant yield increase”
t0“Potato”
Claim · model-written summary
Higher potassium rates were associated with lower tuber specific gravity.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- higher K application ratese0
- Outcome
- tuber-specific gravitye0
- Direction
- reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher K application rates were linked to a reduction in tuber-specific gravity.”
t0“Potato”
Claim · model-written summary
Potassium sulfate and potassium chloride produced similar yields.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both K2SO4 and KCl produced similar yields.”
t0“Potato”
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See all 450 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.