Abstract
The long-term effects of no-till planting practices and rotation on the population dynamics of the soybean cyst nematode (Heterodera glycines) and soybean yield were investigated in field experiments over a period of 8 yr. The experiment was a 2 X 4 factorial, comparing no-till vs. conventional tillage practices in four cropping patterns (continuous soybean, a 1-yr rotation of corn and soybean, a rotation of 2 yr of corn followed by soybean, and a corn-wheat/soybean double-cropping system). Treatments were arranged so that each combination occurred every year after 1986. Soybean after 1 yr of corn had higher yields (P = 0.0001) than soybean after soybean. Two years of corn between soybean crops resulted in soybean yields higher than those after 1 yr of corn in only 2 out of 6 yr. The yields of soybean in the corn, wheat/soybean double-cropping system, however, were generally similar to monoculture soybean. No-till practices had positive or no effects on soybean yield early in the study, but yields of no-till soybean were lower (P = 0.01) than conventionally tilled soybean after several years because weed pressure was greater in no-till plots. Population densities of H. glycines were greater (P < 0.10) in conventionally tilled plots than in no-till plots in 1988 and 1990-1992. Numbers of H. glycines fluctuated in an unpredictable manner from year to year, possibly because of unidentified biological control agents or excessive moisture in certain years. H. glycines population densities declined in a predictable manner when a nonhost was planted
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Claims 9
Claim · model-written summary
Soybean after one year of corn yielded more than soybean after soybean.
- Taxon
- Soybean
Glycine maxe1 - Treatment
- after 1 yr of corne1
- Outcome
- yieldse1
- Direction
- highere1
- Comparator
- soybean after soybeane1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Soybean after 1 yr of corn had higher yields (P = 0.0001) than soybean after soybean”
Claim · model-written summary
Two years of corn between soybean crops gave higher soybean yields than one year of corn in only 2 of 6 years.
- Taxon
- soybeanGlycine maxe2
- Treatment
- Two years of corn between soybean cropse2
- Outcome
- soybean yieldse2
- Direction
- highere2
- Qualifier
- in only 2 out of 6 yre2
- Comparator
- after 1 yr of corne2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Two years of corn between soybean crops resulted in soybean yields higher than those after 1 yr of corn in only 2 out of 6 yr”
Claim · model-written summary
Yields in the corn-wheat/soybean double-cropping system were similar to monoculture soybean.
- Taxon
- soybeanGlycine maxe3
- Treatment
- wheat/soybean double-cropping systeme3
- Outcome
- yields of soybeane3
- Direction
- similare3
- Comparator
- monoculture soybeane3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The yields of soybean in the corn, wheat/soybean double-cropping system, however, were generally similar to monoculture soybean”
Claim · model-written summary
No-till had positive or no effects on soybean yield early in the study.
- Taxon
- soybeanGlycine maxe4
- Treatment
- No-till practicese4
- Outcome
- soybean yielde4
- Direction
- positive or no effectse4
- Qualifier
- early in the studye4
- Comparator
- conventionally tilled soybeane4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“No-till practices had positive or no effects on soybean yield early in the study, but yields of no-till soybean were lower (P = 0.01) than conventionally tilled soybean after several years because weed pressure was greater in no-till plots”
Claim · model-written summary
No-till soybean yielded less than conventionally tilled soybean after several years.
- Taxon
- soybeanGlycine maxe4
- Treatment
- no-tille4
- Outcome
- yields of no-till soybeane4
- Direction
- lowere4
- Qualifier
- after several yearse4
- Comparator
- conventionally tilled soybeane4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“No-till practices had positive or no effects on soybean yield early in the study, but yields of no-till soybean were lower (P = 0.01) than conventionally tilled soybean after several years because weed pressure was greater in no-till plots”
Claim · model-written summary
Yield loss of no-till soybean is attributed to greater weed pressure in no-till plots.
- Taxon
- soybeanGlycine maxe4
- Outcome
- yields of no-till soybeane4
- Qualifier
- weed pressure was greater in no-till plotse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“No-till practices had positive or no effects on soybean yield early in the study, but yields of no-till soybean were lower (P = 0.01) than conventionally tilled soybean after several years because weed pressure was greater in no-till plots”
Claim · model-written summary
Heterodera glycines population densities were greater in conventionally tilled plots than in no-till plots.
- Taxon
- soybeanGlycine maxe0
- Treatment
- conventionally tilled plotse5
- Interactor
- Heterodera glycines
Heterodera glycinese0pest - Outcome
- Population densities of H. glycinese5
- Direction
- greatere5
- Qualifier
- in 1988 and 1990-1992e5
- Comparator
- no-till plotse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The long-term effects of no-till planting practices and rotation on the population dynamics of the soybean cyst nematode (Heterodera glycines) and soybean yield were investigated in field experiments over a period of 8 yr”
e5“Population densities of H. glycines were greater (P < 0.10) in conventionally tilled plots than in no-till plots in 1988 and 1990-1992”
Claim · model-written summary
Heterodera glycines numbers fluctuated unpredictably from year to year.
- Taxon
- soybeanGlycine maxe0
- Interactor
- Heterodera glycinesHeterodera glycinese0pest
- Outcome
- Numbers of H. glycinese6
- Direction
- fluctuatede6
- Qualifier
- fluctuated in an unpredictable manner from year to yeare6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The long-term effects of no-till planting practices and rotation on the population dynamics of the soybean cyst nematode (Heterodera glycines) and soybean yield were investigated in field experiments over a period of 8 yr”
e6“Numbers of H. glycines fluctuated in an unpredictable manner from year to year”
Claim · model-written summary
Heterodera glycines population densities declined predictably when a nonhost was planted.
- Taxon
- soybeanGlycine maxe0
- Treatment
- a nonhost was plantede7
- Interactor
- Heterodera glycinesHeterodera glycinese0pest
- Outcome
- population densitiese7
- Direction
- declinede7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The long-term effects of no-till planting practices and rotation on the population dynamics of the soybean cyst nematode (Heterodera glycines) and soybean yield were investigated in field experiments over a period of 8 yr”
e7“H. glycines population densities declined in a predictable manner when a nonhost was planted”
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