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“yield decrease”

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plus 2 earlier · 1930s

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Intervention effectobservedoriginal resultnegativesignificant (as stated)measured

Claim · model-written summary

Omitting potassium significantly decreased potato yield in 1952.

Taxon: PotatoesSolanum tuberosumt0
Treatment: elimination of potassiume0
Outcome: yielde0
Direction: decreasee0
Qualifier: In 1952e0

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Verbatim

e0
“In 1952 the elimination of potassium did cause a significant decrease in yield.”
✓ located verbatim in the source · abstract, characters 928–1007

t0
“Potatoes”
✓ located verbatim in the source · title, characters 37–45

Title

Utilization of Residual Fertility by Potatoes

R. A. Struchtemeyer; C. E. Cunningham; P. N. Carpenter Soil Science Society of America Journal 1955. doi:10.2136/sssaj1955.03615995001900020026x

Other claims from this paper (3)

Intervention effect Omitting phosphorus from fertilizer significantly decreased potato yields.
Intervention effect Omitting potassium did not significantly reduce potato yield in 1951.
Association Potatoes appeared to mine soil potassium reserves more efficiently than phosphorus reserves.

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“yield decrease”

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