Abstract
Abstract The root-lesion nematode ( Pratylenchus penetrans ) can cause significant reduction in tobacco yield and quality. This nematode also is a parasite of cereal rye ( Secale cereale ), which is a common rotation crop in tobacco areas. Row fumigation prior to transplanting tobacco in the spring is practiced by >95% of Ontario growers to control nematode populations. Planting of Tagetes sp. (marigold) also reduces nematode populations, and when used instead of rye as a rotation crop with tobacco, can provide an alternative to chemical fumigation. Field trials were conducted from 1996 to 1998 to compare the impacts of marigold rotation vs. a traditional fall rye rotation crop, with and without chemical fumigation, on flue-cured tobacco yield, quality, and cost of production. Both the marigold rotation and the non-fumigated rye rotation resulted in slightly less early season N available in the following tobacco crop year compared to the rye + fumigation check. Plant height in July and days to flowering, both measures of early season growth, were highly correlated with fumigation and resultant spring nematode populations in 1996 and 1997. Days to flowering in the marigold plots averaged 5.4 and 4.0 d longer in 1996 site A and 1998 site B, respectively, compared to the rye + fumigation plots. This delay may be related to early season N availability even though the differences in early season inorganic N were relatively small. Marigold rotation increased tobacco yield by 142 and 334 kg/ha in 1996 and 1997, respectively, with no reduction in leaf quality compared to tobacco following rye rotation plus fumigation. This increase may be the result of larger and more laterally distributed tobacco root growth observed after the marigold rotation crop. Yield was negatively correlated with nematode populations in all years. Cost-of-production estimates suggest that growers could adopt a marigold-tobacco cropping system with an increase in profit compared to chemical fumigation.
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Claims 10
Claim · model-written summary
Marigold and non-fumigated rye rotations had slightly less early season nitrogen available than rye with fumigation.
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- marigold rotation and the non-fumigated rye rotatione0
- Outcome
- early season N availablee0
- Direction
- slightly lesse0
- Comparator
- rye + fumigation checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the marigold rotation and the non-fumigated rye rotation resulted in slightly less early season N available in the following tobacco crop year compared to the rye + fumigation check.”
Claim · model-written summary
July height and flowering time were highly correlated with fumigation and spring nematode populations in 1996 and 1997.
- Taxon
- TOBACCONicotiana tabacumt0
- Treatment
- fumigatione0
- Outcome
- Plant height in July and days to floweringe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant height in July and days to flowering, both measures of early season growth, were highly correlated with fumigation and resultant spring nematode populations in 1996 and 1997.”
t0“TOBACCO”
Claim · model-written summary
Marigold plots flowered 5.4 days later than rye plus fumigation in 1996 at site A.
- Taxon
- TOBACCONicotiana tabacumt0
- Treatment
- marigold plotse0
- Outcome
- Days to floweringe0
- Direction
- longere0
- Value
- 5.4e0
- Comparator
- rye + fumigation plotse0
- Setting
- site Ae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Days to flowering in the marigold plots averaged 5.4 and 4.0 d longer in 1996 site A and 1998 site B, respectively, compared to the rye + fumigation plots.”
t0“TOBACCO”
Claim · model-written summary
Marigold plots flowered 4.0 days later than rye plus fumigation in 1998 at site B.
- Taxon
- TOBACCONicotiana tabacumt0
- Treatment
- marigold plotse0
- Outcome
- Days to floweringe0
- Direction
- longere0
- Value
- 4.0 de0
- Comparator
- rye + fumigation plotse0
- Setting
- site Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Days to flowering in the marigold plots averaged 5.4 and 4.0 d longer in 1996 site A and 1998 site B, respectively, compared to the rye + fumigation plots.”
t0“TOBACCO”
Claim · model-written summary
Marigold rotation raised tobacco yield by 142 kg/ha in 1996 relative to rye rotation plus fumigation.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- Marigold rotatione0
- Outcome
- tobacco yielde0
- Direction
- increasede0
- Value
- 142e0
- Comparator
- rye rotation plus fumigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Marigold rotation increased tobacco yield by 142 and 334 kg/ha in 1996 and 1997, respectively, with no reduction in leaf quality compared to tobacco following rye rotation plus fumigation.”
Claim · model-written summary
Marigold rotation raised tobacco yield by 334 kg/ha in 1997 relative to rye rotation plus fumigation.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- Marigold rotatione0
- Outcome
- tobacco yielde0
- Direction
- increasede0
- Value
- 334 kg/hae0
- Comparator
- rye rotation plus fumigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Marigold rotation increased tobacco yield by 142 and 334 kg/ha in 1996 and 1997, respectively, with no reduction in leaf quality compared to tobacco following rye rotation plus fumigation.”
Claim · model-written summary
Marigold rotation did not reduce tobacco leaf quality relative to rye rotation plus fumigation.
- Taxon
- TOBACCONicotiana tabacumt0
- Treatment
- Marigold rotatione1
- Outcome
- leaf qualitye0
- Direction
- no reductione0
- Comparator
- rye rotation plus fumigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with no reduction in leaf quality compared to tobacco following rye rotation plus fumigation”
e1“Marigold rotation increased tobacco yield”
t0“TOBACCO”
Claim · model-written summary
Tobacco roots were larger and more laterally distributed after marigold rotation.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- marigold rotation crope0
- Outcome
- tobacco root growthe0
- Direction
- larger and more laterally distributede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“larger and more laterally distributed tobacco root growth observed after the marigold rotation crop”
Claim · model-written summary
Tobacco yield was negatively correlated with nematode populations in every year.
- Taxon
- TOBACCONicotiana tabacumt0
- Outcome
- Yielde0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield was negatively correlated with nematode populations in all years.”
t0“TOBACCO”
Claim · model-written summary
Cost estimates suggested that a marigold-tobacco system could increase profit over chemical fumigation.
- Taxon
- tobaccoNicotiana tabacume0
- Outcome
- profite0
- Direction
- increasee0
- Comparator
- chemical fumigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cost-of-production estimates suggest that growers could adopt a marigold-tobacco cropping system with an increase in profit compared to chemical fumigation.”
The same questions in other papers
rotation · quality: general · Nicotiana tabacum (tobacco)Positive and negative results
2 papers in the same direction as this paper · 1 reporting no difference from an alternative
- positive
- negative
- negative
rotation · yield · Nicotiana tabacum (tobacco)Positive and negative results
15 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- negative
- negative
16 papers more in this group
See all 20 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.