Abstract
ABSTRACT Eight different 3-year cropping systems, consisting of soybean-canola, soybean-barley, sweet corn-canola, sweet corn-soybean, green bean-sweet corn, canola-sweet corn, barley-clover, and continuous potato (non-rotation control) followed by potato as the third crop in all systems, were established in replicated field plots with two rotation entry points in Presque Isle, ME, in 1998. Cropping system effects on soil microbial community characteristics based on culturable soil microbial populations, single carbon source substrate utilization (SU) profiles, and whole-soil fatty acid methyl ester (FAME) profiles were evaluated in association with the development of soilborne diseases of potato in the 2000 and 2001 field seasons. Soil populations of culturable bacteria and overall microbial activity were highest following barley, canola, and sweet corn crops, and lowest following continuous potato. The SU profiles derived from BIOLOG ECO plates indicated higher substrate richness and diversity and greater utilization of certain carbohydrates, carboxylic acids, and amino acids associated with barley, canola, and some sweet corn rotations, indicating distinct differences in functional attributes of microbial communities among cropping systems. Soil FAME profiles also demonstrated distinct differences among cropping systems in their relative composition of fatty acid types and classes, representing structural attributes of microbial communities. Fatty acids most responsible for differentiation among cropping systems included 12:0, 16:1 omega5c, 16:1 omega7c, 18:1 omega9c, and 18:2omega6c. Based on FAME biomarkers, barley rotations resulted in higher fungi-to-bacteria ratios, sweet corn resulted in greater mycorrhizae populations, and continuous potato produced the lowest amounts of these and other biomarker traits. Incidence and severity of stem and stolon canker and black scurf of potato, caused by Rhizoctonia solani, were reduced for most rotations relative to the continuous potato control. Potato crops following canola, barley, or sweet corn provided the lowest levels of Rhizoctonia disease and best tuber quality, whereas potato crops following clover or soybean resulted in disease problems in some years. Both rotation crop and cropping sequence were important in shaping the microbial characteristics, soilborne disease, and tuber qualities. Several microbial parameters, including microbial populations and SU and FAME profile characteristics, were correlated with potato disease or yield measurements in one or both harvest years. In this study, we have demonstrated distinctive effects of specific rotation crops and cropping sequences on microbial communities and have begun to relate the implications of these changes to crop health and productivity.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 13
Claim · model-written summary
Culturable bacteria and microbial activity were highest after barley, canola and sweet corn, and lowest after continuous potato.
- Taxon
- potato
Solanum tuberosume0 - Treatment
- barley, canola, and sweet corn cropse0
- Outcome
- Soil populations of culturable bacteria and overall microbial activitye0
- Direction
- higheste0
- Comparator
- continuous potatoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil populations of culturable bacteria and overall microbial activity were highest following barley, canola, and sweet corn crops, and lowest following continuous potato”
Claim · model-written summary
Barley, canola and some sweet corn rotations showed higher substrate richness, diversity and utilization.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- barley, canola, and some sweet corn rotationse0
- Outcome
- substrate richness and diversity and greater utilizatione0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher substrate richness and diversity and greater utilization of certain carbohydrates, carboxylic acids, and amino acids associated with barley, canola, and some sweet corn rotations”
t0“Potato”
Claim · model-written summary
Soil FAME profiles differed in fatty acid composition among cropping systems.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- relative composition of fatty acid types and classese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil FAME profiles also demonstrated distinct differences among cropping systems in their relative composition of fatty acid types and classes”
t0“Potato”
Claim · model-written summary
Five fatty acids were chiefly responsible for differentiation among cropping systems.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- Fatty acids most responsible for differentiation among cropping systemse0
- Qualifier
- 12:0, 16:1 omega5c, 16:1 omega7c, 18:1 omega9c, and 18:2omega6ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fatty acids most responsible for differentiation among cropping systems included 12:0, 16:1 omega5c, 16:1 omega7c, 18:1 omega9c, and 18:2omega6c”
t0“Potato”
Claim · model-written summary
Barley rotations had higher fungi-to-bacteria ratios.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- barley rotationse0
- Outcome
- fungi-to-bacteria ratiose0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley rotations resulted in higher fungi-to-bacteria ratios”
t0“potato”
Claim · model-written summary
Sweet corn rotations had greater mycorrhizae populations.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- sweet corne0
- Interactor
- mycorrhizaee0symbiont
- Outcome
- mycorrhizae populationse0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sweet corn resulted in greater mycorrhizae populations”
t0“potato”
Claim · model-written summary
Continuous potato had the lowest amounts of fungi-to-bacteria and mycorrhizae biomarker traits.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- continuous potatoe0
- Outcome
- biomarker traitse0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“continuous potato produced the lowest amounts of these and other biomarker traits”
Claim · model-written summary
Most rotations reduced incidence and severity of potato stem and stolon canker and black scurf versus continuous potato.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- most rotationse0
- Interactor
- Rhizoctonia solani
Rhizoctonia solanie0pathogen - Outcome
- Incidence and severity of stem and stolon canker and black scurfe0
- Direction
- reducede0
- Comparator
- continuous potato controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Incidence and severity of stem and stolon canker and black scurf of potato, caused by Rhizoctonia solani, were reduced for most rotations relative to the continuous potato control”
Claim · model-written summary
Canola, barley or sweet corn preceding potato gave the lowest Rhizoctonia disease.
- Taxon
- PotatoSolanum tuberosume0
- Treatment
- canola, barley, or sweet corne0
- Interactor
- Rhizoctonia
.jpg?width=60)
Rhizoctoniae0pathogen - Outcome
- Rhizoctonia diseasee0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Potato crops following canola, barley, or sweet corn provided the lowest levels of Rhizoctonia disease”
Claim · model-written summary
Canola, barley or sweet corn preceding potato gave the best tuber quality.
- Taxon
- PotatoSolanum tuberosume0
- Treatment
- canola, barley, or sweet corne0
- Outcome
- tuber qualitye0
- Direction
- beste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potato crops following canola, barley, or sweet corn provided the lowest levels of Rhizoctonia disease and best tuber quality”
Claim · model-written summary
Clover or soybean preceding potato resulted in disease problems in some years.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- clover or soybeane0
- Outcome
- disease problemse0
- Qualifier
- in some yearse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato crops following clover or soybean resulted in disease problems in some years”
Claim · model-written summary
Rotation crop and sequence shaped microbial characteristics, soilborne disease and tuber qualities.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- rotation crop and cropping sequencee0
- Outcome
- microbial characteristics, soilborne disease, and tuber qualitiese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both rotation crop and cropping sequence were important in shaping the microbial characteristics, soilborne disease, and tuber qualities”
t0“potato”
Claim · model-written summary
Microbial population and SU and FAME profiles correlated with potato disease or yield measurements in one or both years.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- potato disease or yield measurementse0
- Qualifier
- microbial populations and SU and FAME profile characteristicse0
- Setting
- one or both harvest yearse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Several microbial parameters, including microbial populations and SU and FAME profile characteristics, were correlated with potato disease or yield measurements in one or both harvest years”
The same questions in other papers
Zea mays subsp. mays · pest · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
Hordeum vulgare · quality: general · Solanum tuberosum (potato)Results agree
1 paper in the same direction as this paper
- positive
rotation · molecular: metabolites · Solanum tuberosum (potato)Results agree
3 papers in the same direction as this paper
- negative
- negative
- no effect
rotation · Rhizoctonia solani · Solanum tuberosum (potato)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
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.