Abstract
Best fit quadratic response curves relating tuber yields with fertilizer treatment rates from a 3-yr 4 × 4 factorial field experiment provided the bases for diagnosing nutrient deficiencies of N and P. These curves were compared with similar response curves of leaf nutrient concentrations and for deficiency indices calculated by the Diagnosis and Recommendation Integrated System (DRIS). Critical nutrient concentrations (CNCs) of 5.93 and 5.44% of N and 0.47 and 0.35% of P were associated with estimated yield decrements of < 5% and > 15% of the maxima. Corresponding DRIS indices were −2.1 and −6.7 for N and −10 and −26 for P. Although there were no yield responses to applied K in 10 field experiments, 4 and 3% were selected as CNCs possibly indicative of K-supplying potential. Corresponding DRIS values were 5.6 and −17. When these CNC values were applied to 372 commercial fields sampled over an 8-yr period, there were 30, 44, and 12% in the top class for N, P, and K, respectively, while 34, 8, and 7% were in the bottom deficiency class. The DRIS system placed 41, 76, and 76% of the fields in the same deficiency classes for N, P, and K, respectively, but only 13, 0, and 0% differed by more than one class. There appeared to be limited potential advantages for the DRIS method of diagnosis.Key words: Solanum tuberosum L., leaf analysis, fertilizer rates, potato.
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Claims 12
Claim · model-written summary
Critical N concentrations of 5.93 and 5.44% corresponded to yield decrements below 5% and above 15%.
- Taxon
- POTATOES
Solanum tuberosumt0 - Outcome
- Critical nutrient concentrations (CNCs)e0
- Value
- 5.93 and 5.44%e0
- Qualifier
- estimated yield decrements of < 5% and > 15% of the maximae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Critical nutrient concentrations (CNCs) of 5.93 and 5.44% of N and 0.47 and 0.35% of P were associated with estimated yield decrements of < 5% and > 15% of the maxima”
t0“POTATOES”
Claim · model-written summary
Critical P concentrations of 0.47 and 0.35% corresponded to yield decrements below 5% and above 15%.
- Taxon
- POTATOESSolanum tuberosumt0
- Outcome
- Critical nutrient concentrationse1
- Value
- 0.47 and 0.35%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“0.47 and 0.35% of P were associated with estimated yield decrements of < 5% and > 15% of the maxima”
e1“Critical nutrient concentrations (CNCs) of 5.93 and 5.44% of N and 0.47 and 0.35% of P were associated with estimated yield decrements of < 5% and > 15% of the maxima”
t0“POTATOES”
Claim · model-written summary
The corresponding DRIS indices were −2.1 and −6.7 for N.
- Taxon
- POTATOESSolanum tuberosumt0
- Outcome
- DRIS indicese0
- Value
- −2.1 and −6.7e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corresponding DRIS indices were −2.1 and −6.7 for N”
t0“POTATOES”
Claim · model-written summary
The corresponding DRIS indices were −10 and −26 for P.
- Taxon
- POTATOESSolanum tuberosumt0
- Outcome
- DRIS indicese1
- Value
- −10 and −26e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“−10 and −26 for P”
e1“Corresponding DRIS indices”
t0“POTATOES”
Claim · model-written summary
Applied K produced no yield response in 10 field experiments.
- Taxon
- POTATOESSolanum tuberosumt0
- Treatment
- applied Ke0
- Outcome
- yield responsese0
- Direction
- noe0
- Value
- 10 field experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were no yield responses to applied K in 10 field experiments”
t0“POTATOES”
Claim · model-written summary
Four and 3% were selected as critical K concentrations indicative of K supply.
- Taxon
- POTATOESSolanum tuberosumt0
- Outcome
- CNCse0
- Value
- 4 and 3%e0
- Qualifier
- possibly indicative of K-supplying potentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“4 and 3% were selected as CNCs possibly indicative of K-supplying potential”
t0“POTATOES”
Claim · model-written summary
The corresponding K DRIS values were 5.6 and −17.
- Taxon
- POTATOESSolanum tuberosumt0
- Outcome
- DRIS valuese0
- Value
- 5.6 and −17e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corresponding DRIS values were 5.6 and −17”
t0“POTATOES”
Claim · model-written summary
CNC placed 30, 44 and 12% of fields in the top N, P and K classes, respectively.
- Taxon
- POTATOESSolanum tuberosumt0
- Outcome
- top class for N, P, and Ke0
- Value
- 30, 44, and 12%e0
- Qualifier
- 372 commercial fieldse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were 30, 44, and 12% in the top class for N, P, and K, respectively”
e1“these CNC values were applied to 372 commercial fields sampled over an 8-yr period”
t0“POTATOES”
Claim · model-written summary
CNC placed 34, 8 and 7% of fields in the bottom N, P and K deficiency classes.
- Taxon
- POTATOESSolanum tuberosumt0
- Outcome
- bottom deficiency classe0
- Value
- 34, 8, and 7%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“34, 8, and 7% were in the bottom deficiency class”
t0“POTATOES”
Claim · model-written summary
DRIS matched CNC deficiency classes for 41, 76 and 76% of N, P and K fields.
- Taxon
- POTATOESSolanum tuberosumt0
- Outcome
- same deficiency classes for N, P, and Ke0
- Value
- 41, 76, and 76%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The DRIS system placed 41, 76, and 76% of the fields in the same deficiency classes for N, P, and K, respectively”
t0“POTATOES”
Claim · model-written summary
Only 13, 0 and 0% of N, P and K fields differed by more than one deficiency class between methods.
- Taxon
- POTATOESSolanum tuberosumt0
- Outcome
- differed by more than one classe0
- Value
- 13, 0, and 0%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only 13, 0, and 0% differed by more than one class”
t0“POTATOES”
Claim · model-written summary
DRIS appeared to offer limited diagnostic advantage.
- Taxon
- POTATOESSolanum tuberosumt0
- Outcome
- limited potential advantages for the DRIS method of diagnosise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There appeared to be limited potential advantages for the DRIS method of diagnosis”
t0“POTATOES”
The same questions in other papers
potassium · yield · Solanum tuberosum (potato)Results differ
7 papers in the same direction as this paper · 61 in the opposite direction
- positive
- positive
- positive
65 papers more in this group
See all 69 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.