Abstract
ABSTRACT A rotation trial spanning nine consecutive growing seasons was established in 2004 to study cumulative effects of specific onion‐ and potato‐focused crop rotations on soil nutrient levels, soil biological communities, plant productivity and soilborne diseases. Soil microbial activity, as determined by fluorescein diacetate hydrolysis, was greatest in the ‘sustainable’ potato rotation in five of the 6 years that the test was carried out. Rhizoctonia solani anastomosis group 3 DNA was first detected in potato monoculture soils in the fifth year, with numbers increasing from then on, but was not detected in the onion monoculture throughout the trial period. Potato yields were greater when a crop other than potato was grown in the previous year compared with when potatoes were the preceding crop. After 2005, mean annual onion yields from the onion monoculture were less than yields from the other rotations. Black scurf on potato tubers was the primary soilborne disease observed during the study, and the incidence of this disease was greater in the potato monoculture than the other rotations after the second year, and least when potatoes had not been grown in the same ground the three previous seasons. This long‐term crop rotation study has demonstrated the benefits of a ‘sustainable’ rotation where potatoes or onions were grown every fourth growing season, with different crops (oat, broccoli, cabbage, squash) grown in the intervening years, compared with the conventional consecutive biennial crops of potato and onion.
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Claims 9
Claim · model-written summary
Soil microbial activity was greatest in the sustainable potato rotation in five of six tested years.
- Taxon
- potato
Solanum tuberosume0 - Treatment
- ‘sustainable’ potato rotatione0
- Outcome
- Soil microbial activitye0
- Direction
- greateste0
- Value
- five of the 6 yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil microbial activity, as determined by fluorescein diacetate hydrolysis, was greatest in the ‘sustainable’ potato rotation in five of the 6 years that the test was carried out”
Claim · model-written summary
R. solani DNA first appeared in potato monoculture soil in year five and increased thereafter.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- potato monoculturee0
- Interactor
- Rhizoctonia solani
Rhizoctonia solanie0pathogen - Outcome
- Rhizoctonia solani anastomosis group 3 DNAe0
- Direction
- increasinge0
- Qualifier
- in the fifth yeare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizoctonia solani anastomosis group 3 DNA was first detected in potato monoculture soils in the fifth year, with numbers increasing from then on”
Claim · model-written summary
R. solani DNA was undetected in onion monoculture during the trial.
- Taxon
- onion
Allium cepae0 - Treatment
- onion monoculturee0
- Interactor
- Rhizoctonia solaniRhizoctonia solanie1pathogen
- Outcome
- Rhizoctonia solani anastomosis group 3 DNAe1
- Direction
- not detectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was not detected in the onion monoculture throughout the trial period”
e1“Rhizoctonia solani anastomosis group 3 DNA”
Claim · model-written summary
Potato yields were higher when the preceding crop was not potato.
- Taxon
- PotatoSolanum tuberosume0
- Treatment
- a crop other than potato was grown in the previous yeare0
- Outcome
- Potato yieldse0
- Direction
- greatere0
- Comparator
- when potatoes were the preceding crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potato yields were greater when a crop other than potato was grown in the previous year compared with when potatoes were the preceding crop”
Claim · model-written summary
After 2005 onion monoculture yielded less than other rotations.
- Taxon
- onionAllium cepae0
- Treatment
- onion monoculturee0
- Outcome
- mean annual onion yieldse0
- Direction
- less thane0
- Qualifier
- After 2005e0
- Comparator
- other rotationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 2005, mean annual onion yields from the onion monoculture were less than yields from the other rotations”
Claim · model-written summary
Black scurf on potato tubers was the primary soilborne disease observed.
- Taxon
- potatoSolanum tuberosume0
- Organ / stage
- tuberse0
- Outcome
- Black scurfe0
- Qualifier
- primary soilborne diseasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Black scurf on potato tubers was the primary soilborne disease observed during the study”
Claim · model-written summary
Black scurf incidence was higher in potato monoculture than other rotations after year two.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- potato monoculturee0
- Outcome
- incidence of this diseasee0
- Direction
- greatere0
- Qualifier
- after the second yeare0
- Comparator
- other rotationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the incidence of this disease was greater in the potato monoculture than the other rotations after the second year”
e1“Black scurf on potato tubers”
Claim · model-written summary
Black scurf incidence was lowest after three potato-free seasons.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- potatoes had not been grown in the same ground the three previous seasonse0
- Outcome
- Black scurfe1
- Direction
- leaste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“least when potatoes had not been grown in the same ground the three previous seasons”
e1“Black scurf on potato tubers”
Claim · model-written summary
The authors conclude that a four-year rotation benefits potato and onion production relative to consecutive biennial cropping.
- Taxon
- potatoes or onionsSolanum tuberosumAllium cepae0
- Treatment
- ‘sustainable’ rotatione0
- Outcome
- benefitse0
- Comparator
- conventional consecutive biennial crops of potato and onione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“benefits of a ‘sustainable’ rotation where potatoes or onions were grown every fourth growing season, with different crops (oat, broccoli, cabbage, squash) grown in the intervening years, compared with the conventional consecutive biennial crops of potato and onion”
The same questions in other papers
rotation · yield · Allium cepa (onion)Positive and negative results
1 in the opposite direction
- positive
rotation · disease · Solanum tuberosum (potato)Positive and negative results
8 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
13 papers more in this group
See all 17 papers →rotation · soil: biology · Solanum tuberosum (potato)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.