Abstract
The potato industry in Kenya is threatened by bacterial wilt because most production areas are infested with the wilt-causing Ralstonia solanacearum and over 50% yield losses have been reported. Continuous cultivation causes soil physical and biological constrains that greatly affect the crop performance and increase proliferation of the bacterium. Rotation with non-host or suppressant plant species could contribute to considerable reduction of bacterial wilt in the subsequent potato crops. This study tested the effect of different crop sequences on R. solanacearum population in the soil, wilting incidence and yield of potato. Two season field experiments were conducted at two sites (Egerton University, Njoro and National Agricultural Research Laboratories (NARL), Kabete) with 17 different crop sequences. Rotations involving brassica and legumes with potato gave a higher emergence percentage compared to the other sequences. The bacterial population was significantly influenced by the different environments from the first season to the third season; F (1, 102) =53.2, P<0.001, F (1, 102) =12.5, P< 0.001 and F (1, 102) =236.8, P<0.001 respectively. There was a significant effect F(16,119)=7.063, P<0.001 of the crop rotation sequences on the wilting incidence of potato. Pre cropping potato with spring onion and barley resulted to a significantly lower wilting incidence compared to all the other crop rotation sequences with a mean of 8.3% across sites. The results showed that Potato-Lablab-Potato and Cabbage-Lablab had the highest yield with 19.9 and of 19.7 tons/ha in the one crop rotations and pre crops to potato respectively. A Genotype x Environmental means versus IPCA scores showed that the yield due to barley-spring onion, spring onion-barley and wheat-spring onion as pre crops were more stable in both locations compared to the other cropping sequences. The study indicates that rotations involving spring onion with the locally grown cereals such as barley and wheat can be utilized in curbing bacterial wilt. Rotations involving lablab and cabbage may also be used to increase the yield of potato in bacterial wilt infested fields. These crops should be used in rotations involving more seasons so as to achieve better effects. Key words: Bacterial wilt, crop rotation, potato yield, Ralstonia solanacearum, wilting incidence.
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Claims 12
Claim · model-written summary
Brassica and legume rotations gave higher potato emergence than other sequences.
- Taxon
- potato
Solanum tuberosume0 - Treatment
- Rotations involving brassica and legumese1
- Outcome
- emergence percentagee1
- Direction
- highere1
- Comparator
- the other sequencese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato in fields inoculated with bacterial wilt”
e1“Rotations involving brassica and legumes with potato gave a higher emergence percentage compared to the other sequences”
Claim · model-written summary
Bacterial populations varied significantly by environment over the three seasons.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- bacterial populatione1
- Setting
- different environmentse1
Not reportedInteractorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato in fields inoculated with bacterial wilt”
e1“The bacterial population was significantly influenced by the different environments from the first season to the third season”
Claim · model-written summary
Crop rotation sequences significantly affected potato wilting incidence.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- crop rotation sequencese1
- Outcome
- wilting incidence of potatoe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato in fields inoculated with bacterial wilt”
e1“There was a significant effect F(16,119)=7.063, P<0.001 of the crop rotation sequences on the wilting incidence of potato”
Claim · model-written summary
Spring onion and barley precrops produced lower potato wilting incidence than all other sequences, averaging 8.3%.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- spring onion and barleye1
- Outcome
- wilting incidencee1
- Direction
- lowere1
- Value
- 8.3%e1
- Comparator
- all the other crop rotation sequencese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato in fields inoculated with bacterial wilt”
e1“Pre cropping potato with spring onion and barley resulted to a significantly lower wilting incidence compared to all the other crop rotation sequences with a mean of 8.3% across sites”
Claim · model-written summary
Potato-Lablab-Potato gave the highest yield among one-crop rotations at 19.9 tons/ha.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- Potato-Lablab-Potatoe1
- Outcome
- yielde1
- Direction
- higheste1
- Value
- 19.9e1
- Comparator
- one crop rotationse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato in fields inoculated with bacterial wilt”
e1“Potato-Lablab-Potato and Cabbage-Lablab had the highest yield with 19.9 and of 19.7 tons/ha in the one crop rotations and pre crops to potato respectively”
Claim · model-written summary
Cabbage-Lablab gave the highest potato yield among precrops at 19.7 tons/ha.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- Cabbage-Lablabe1
- Outcome
- yielde1
- Direction
- higheste1
- Value
- 19.7 tons/hae1
- Comparator
- pre crops to potatoe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato in fields inoculated with bacterial wilt”
e1“Potato-Lablab-Potato and Cabbage-Lablab had the highest yield with 19.9 and of 19.7 tons/ha in the one crop rotations and pre crops to potato respectively”
Claim · model-written summary
Barley-spring onion precrops gave more stable potato yield across both locations.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- barley-spring onione1
- Outcome
- yielde1
- Direction
- more stablee1
- Comparator
- the other cropping sequencese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato in fields inoculated with bacterial wilt”
e1“the yield due to barley-spring onion, spring onion-barley and wheat-spring onion as pre crops were more stable in both locations compared to the other cropping sequences”
Claim · model-written summary
Spring onion-barley precrops gave more stable potato yield across both locations.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- spring onion-barleye1
- Outcome
- yielde1
- Direction
- more stablee1
- Comparator
- the other cropping sequencese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato in fields inoculated with bacterial wilt”
e1“the yield due to barley-spring onion, spring onion-barley and wheat-spring onion as pre crops were more stable in both locations compared to the other cropping sequences”
Claim · model-written summary
Wheat-spring onion precrops gave more stable potato yield across both locations.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- wheat-spring onione1
- Outcome
- yielde1
- Direction
- more stablee1
- Comparator
- the other cropping sequencese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato in fields inoculated with bacterial wilt”
e1“the yield due to barley-spring onion, spring onion-barley and wheat-spring onion as pre crops were more stable in both locations compared to the other cropping sequences”
Claim · model-written summary
The authors recommend spring onion rotations with barley and wheat to curb bacterial wilt.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- curbing bacterial wilte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato in fields inoculated with bacterial wilt”
e1“rotations involving spring onion with the locally grown cereals such as barley and wheat can be utilized in curbing bacterial wilt”
Claim · model-written summary
The authors recommend lablab and cabbage rotations to increase potato yield.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- increase the yield of potatoe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato in fields inoculated with bacterial wilt”
e1“Rotations involving lablab and cabbage may also be used to increase the yield of potato in bacterial wilt infested fields”
Claim · model-written summary
The authors recommend testing these crops in rotations over more seasons.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- rotations involving more seasonse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato in fields inoculated with bacterial wilt”
e1“These crops should be used in rotations involving more seasons so as to achieve better effects”
The same questions in other papers
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- no effect
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Allium cepa · disease · Solanum tuberosum (potato)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
rotation · growth · Solanum tuberosum (potato)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- 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.