Abstract
To determine the effects of crop rotation on potato bacterial wilt incidence and tuber yields, one-and two-season rotation experiments were conducted during 1995-1999 at Kachwekano Agricultural Research and Development Centre located at an altitude of 2200 meters in southwestern Uganda. Pulses, cereals, root crops and vegetables commonly grown in the area were included in different sets of rotation experiments. Each time, prior to planting the experiment, the field was planted to a bacterial wilt susceptible potato variety and artificial inoculation was also done, when needed, to achieve a somewhat uniform distribution of Ralstonia solanacearum. A one-season rotation in heavily infested field (>90% wilt incidence) with wheat and maize did not significantly reduce wilt but increased ware tuber yield, while the effects of phaseolus beans were not significant. On the contrary, a one-season rotation in mildly infested field (about 15-20% infestation) resulted in a significant reduction in wilt incidence as compared to the control. The highest wilt incidence under rotation was below 13% as compared to 62% in the control. Finger millet and sweetpotatoes reduced wilt the most, while carrots and onions reduced the least. There were no significant yield differences among the rotation treatments except for the control. A two-season rotation on heavily infested soil reduced wilt to 22% - 49% as compared to 81% in the control. The highest wilt reduction was obtained with potato-beans-maize-potato treatment, while the lowest reduction was with potato-maize-maize-potato. Total yields and ware potatoes increased from 3.2 t ha-1 with the control monocrop to 9.3 - 11 t ha-1 with rotation and marketable yields increased from 1.8 t ha-1 to 6.7 - 9.2 t ha-1. Planting different crops in two consecutive seasons performed better than planting the same crop. Interestingly, sweetpotato, which is a major staple food in the area this experiment was conducted, was found to be a good rotation crop for reducing wilt. Beans, the most important food crop and a protein source, but probably a symptom less carrier of Ralstonia solanacearum can be a good rotation crop if used before or after cereals in a potato rotation scheme. Key Words: Crop rotation, infestations, marketable yield, Solanum tuberosum, ware potatoes, wilt incidence (African Crop Science Journal 2001 9(1): 257-266)
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Claims 16
Claim · model-written summary
Wheat rotation in heavily infested fields did not significantly reduce potato wilt.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- wheate0
- Outcome
- wilte0
- Direction
- did not significantly reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A one-season rotation in heavily infested field (>90% wilt incidence) with wheat and maize did not significantly reduce wilt but increased ware tuber yield”
t0“potato”
Claim · model-written summary
Maize rotation in heavily infested fields did not significantly reduce potato wilt.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- maizee0
- Outcome
- wilte0
- Direction
- did not significantly reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A one-season rotation in heavily infested field (>90% wilt incidence) with wheat and maize did not significantly reduce wilt but increased ware tuber yield”
t0“potato”
Claim · model-written summary
Wheat rotation increased potato ware tuber yield in heavily infested fields.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- wheate0
- Outcome
- ware tuber yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A one-season rotation in heavily infested field (>90% wilt incidence) with wheat and maize did not significantly reduce wilt but increased ware tuber yield”
t0“potato”
Claim · model-written summary
Maize rotation increased potato ware tuber yield in heavily infested fields.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- maizee0
- Outcome
- ware tuber yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A one-season rotation in heavily infested field (>90% wilt incidence) with wheat and maize did not significantly reduce wilt but increased ware tuber yield”
t0“potato”
Claim · model-written summary
Phaseolus bean rotation had no significant reported effect.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- phaseolus beanse0
- Outcome
- effectse0
- Direction
- not significante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while the effects of phaseolus beans were not significant.”
t0“potato”
Claim · model-written summary
One-season rotation in mildly infested fields significantly reduced potato wilt incidence compared with control.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- one-season rotatione0
- Outcome
- wilt incidencee0
- Direction
- reductione0
- Qualifier
- about 15-20% infestatione0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a one-season rotation in mildly infested field (about 15-20% infestation) resulted in a significant reduction in wilt incidence as compared to the control.”
t0“potato”
Claim · model-written summary
The highest wilt incidence under rotation was below 13%, compared with 62% in control.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- rotatione0
- Outcome
- wilt incidencee0
- Direction
- belowe0
- Value
- below 13%e0
- Qualifier
- 62%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest wilt incidence under rotation was below 13% as compared to 62% in the control.”
t0“potato”
Claim · model-written summary
Finger millet and sweetpotato rotations reduced potato wilt most.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Finger millet and sweetpotatoese0
- Outcome
- wilte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Finger millet and sweetpotatoes reduced wilt the most, while carrots and onions reduced the least.”
t0“potato”
Claim · model-written summary
Carrot and onion rotations reduced potato wilt least.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- carrots and onionse0
- Outcome
- wilte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Finger millet and sweetpotatoes reduced wilt the most, while carrots and onions reduced the least.”
t0“potato”
Claim · model-written summary
Yield differences among rotation treatments were not significant, except versus control.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- rotation treatmentse0
- Outcome
- yield differencese0
- Direction
- no significante0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were no significant yield differences among the rotation treatments except for the control.”
t0“potato”
Claim · model-written summary
Two-season rotation lowered potato wilt to 22%–49%, versus 81% under control.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- two-season rotatione0
- Outcome
- wilte0
- Direction
- reducede0
- Value
- 22% - 49%e0
- Qualifier
- 81%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A two-season rotation on heavily infested soil reduced wilt to 22% - 49% as compared to 81% in the control.”
t0“potato”
Claim · model-written summary
Potato-beans-maize-potato gave the greatest wilt reduction.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- potato-beans-maize-potatoe0
- Outcome
- wilt reductione0
- Direction
- higheste0
- Comparator
- potato-maize-maize-potatoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest wilt reduction was obtained with potato-beans-maize-potato treatment, while the lowest reduction was with potato-maize-maize-potato.”
Claim · model-written summary
Potato-maize-maize-potato gave the lowest wilt reduction.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- potato-maize-maize-potatoe0
- Outcome
- wilt reductione0
- Direction
- loweste0
- Comparator
- potato-beans-maize-potatoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest wilt reduction was obtained with potato-beans-maize-potato treatment, while the lowest reduction was with potato-maize-maize-potato.”
Claim · model-written summary
Rotation increased total and ware potato yields from 3.2 to 9.3–11 t ha-1.
- Taxon
- potatoesSolanum tuberosume0
- Treatment
- rotatione0
- Outcome
- Total yields and ware potatoese0
- Direction
- increasede0
- Value
- 9.3 - 11 t ha-1e0
- Qualifier
- 3.2 t ha-1e0
- Comparator
- control monocrope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total yields and ware potatoes increased from 3.2 t ha-1 with the control monocrop to 9.3 - 11 t ha-1 with rotation”
Claim · model-written summary
Rotation increased marketable potato yields from 1.8 to 6.7–9.2 t ha-1.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- marketable yieldse0
- Direction
- increasede0
- Value
- 6.7 - 9.2 t ha-1e0
- Qualifier
- 1.8 t ha-1e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“marketable yields increased from 1.8 t ha-1 to 6.7 - 9.2 t ha-1.”
t0“potato”
Claim · model-written summary
Planting different crops in consecutive seasons performed better than repeating the same crop.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Planting different crops in two consecutive seasonse0
- Outcome
- performed bettere0
- Direction
- bettere0
- Comparator
- planting the same crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Planting different crops in two consecutive seasons performed better than planting the same crop.”
t0“potato”
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