Abstract
Meadow soils could supply significant amounts of N for several years and reduce N requirements for the potato (Solanum tuberosum L.). We examined a combination of three crop sequences, three cultivars and six N rates in relation to tuber yield and quality. Superior, Kennebec and Snowden were grown as follows on a Tilly silty loam between 1993 and 1995: (1) 3-yr continuous potato cropping of Superior, (2) 3-yr continuous potato cropping starting with Snowden and followed by 2 yr of Kennebec, and (3) 3-yr sequence of Kennebec, oat (Avena sativa L. 'Marion') and Superior. There were six N treatments (0, 70, 105, 140, 175 and 210 kg N ha −1 ) and a split application of 140 kg N ha −1 (half at seeding and half before hilling). The seasons were either favorable to growth (1993), relatively wet (1994) or relatively dry (1995). In 1993 and 1994, total yield varied between 37 and 50 t ha −1 . In 1995, continuous cropping of Kennebec and Superior produced 28 t ha −1 compared with 37 t ha −1 under crop rotation. The rotation increased total yield of Superior by 34% and graded yield by 42% in 1995. The N requirement was closely related to yield, rather than cultivar. Compared with continuous cropping of Superior, tuber-quality index was highest with the rotation for rhizoctonia (Rhizoctonia solani) (67 vs. 57) and common scab (Streptomyces scabies) (90 vs. 82). The incidence of both diseases decreased when at least 70 kg N ha −1 was applied. For common scab, skin coverages was higher at rates of 0, 175 and 210 kg N ha −1 than at intermediate rates of 70–140 kg N ha −1 . Mineral N accumulated in the 0–60-cm layer in the interrow and increased rapidly when N rates exceeded 105 kg N ha −1 . After sod breakup an N rate in the range of 70–100 kg N ha −1 and crop rotation with cereals sustained the productivity of the potato during 3 yr while minimizing the environmental impact of mineral N. Key words: Crop rotation, common scab, rhizoctonia, reduced N rates, Solanum tuberosum L.
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Claims 11
Claim · model-written summary
Total yield ranged from 37 to 50 t ha −1 in 1993 and 1994.
- Taxon
- potato
Solanum tuberosumt0 - Outcome
- total yielde0
- Value
- 37 and 50 t ha −1e0
- Qualifier
- 1993 and 1994e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1993 and 1994, total yield varied between 37 and 50 t ha −1 .”
t0“Potato”
Claim · model-written summary
Continuous Kennebec and Superior cropping yielded 28 t ha −1 versus 37 t ha −1 under rotation in 1995.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- continuous cropping of Kennebec and Superiore0
- Outcome
- producede0
- Value
- 28 t ha −1e0
- Qualifier
- 37 t ha −1e0
- Comparator
- crop rotatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1995, continuous cropping of Kennebec and Superior produced 28 t ha −1 compared with 37 t ha −1 under crop rotation.”
t0“Potato”
Claim · model-written summary
Rotation increased total yield of Superior by 34% in 1995.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- Superiore0
- Treatment
- rotatione0
- Outcome
- total yielde0
- Direction
- increasede0
- Value
- 34%e0
- Qualifier
- 1995e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rotation increased total yield of Superior by 34% and graded yield by 42% in 1995.”
t0“Potato”
Claim · model-written summary
Rotation increased graded yield of Superior by 42% in 1995.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- Superiore0
- Treatment
- rotatione0
- Outcome
- graded yielde0
- Direction
- increasede0
- Value
- 42%e0
- Qualifier
- 1995e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rotation increased total yield of Superior by 34% and graded yield by 42% in 1995.”
t0“Potato”
Claim · model-written summary
Nitrogen requirement tracked yield more closely than cultivar.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- cultivare0
- Outcome
- N requiremente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N requirement was closely related to yield, rather than cultivar.”
t0“Potato”
Claim · model-written summary
Rotation gave the highest rhizoctonia tuber-quality index, 67 versus 57 under continuous Superior cropping.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- rotatione0
- Interactor
- Rhizoctonia solani
Rhizoctonia solanie0pathogen - Outcome
- tuber-quality indexe0
- Direction
- higheste0
- Value
- 67e0
- Qualifier
- 57e0
- Comparator
- continuous cropping of Superiore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with continuous cropping of Superior, tuber-quality index was highest with the rotation for rhizoctonia (Rhizoctonia solani) (67 vs. 57) and common scab (Streptomyces scabies) (90 vs. 82).”
t0“Potato”
Claim · model-written summary
Rotation gave the highest common scab tuber-quality index, 90 versus 82 under continuous Superior cropping.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- rotatione0
- Interactor
- Streptomyces scabiesStreptomyces scabieie0pathogen
- Outcome
- tuber-quality indexe0
- Direction
- higheste0
- Value
- 90e0
- Qualifier
- 82e0
- Comparator
- continuous cropping of Superiore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with continuous cropping of Superior, tuber-quality index was highest with the rotation for rhizoctonia (Rhizoctonia solani) (67 vs. 57) and common scab (Streptomyces scabies) (90 vs. 82).”
t0“Potato”
Claim · model-written summary
At least 70 kg N ha −1 reduced incidence of both diseases.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- at least 70 kg N ha −1e0
- Outcome
- incidence of both diseasese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The incidence of both diseases decreased when at least 70 kg N ha −1 was applied.”
t0“Potato”
Claim · model-written summary
Common scab skin coverage was higher at 0, 175 and 210 kg N ha −1 than at 70–140 kg N ha −1.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- 0, 175 and 210 kg N ha −1e0
- Interactor
- common scabe0pathogen
- Outcome
- skin coveragese0
- Direction
- highere0
- Comparator
- 70–140 kg N ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For common scab, skin coverages was higher at rates of 0, 175 and 210 kg N ha −1 than at intermediate rates of 70–140 kg N ha −1 .”
t0“Potato”
Claim · model-written summary
Soil mineral N rose rapidly above 105 kg N ha −1.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- N rates exceeded 105 kg N ha −1e0
- Outcome
- Mineral Ne0
- Direction
- increased rapidlye0
- Qualifier
- 0–60-cm layer in the interrowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mineral N accumulated in the 0–60-cm layer in the interrow and increased rapidly when N rates exceeded 105 kg N ha −1 .”
t0“Potato”
Claim · model-written summary
Authors recommend 70–100 kg N ha −1 and cereal rotation after sod breakup to sustain potato productivity and limit mineral N impact.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- N rate in the range of 70–100 kg N ha −1 and crop rotation with cerealse0
- Qualifier
- during 3 yre0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After sod breakup an N rate in the range of 70–100 kg N ha −1 and crop rotation with cereals sustained the productivity of the potato during 3 yr while minimizing the environmental impact of mineral N.”
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rotation · Rhizoctonia solani · Solanum tuberosum (potato)Results agree
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See all 5 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.