Abstract
Field experiments were conducted from 1999 to 2000 to assess the effect of nitrogen fertilization levels (0.225 and 450 kg.hm-2) on the population dynamics of cotton bollworm (Helicoverpa armigera) and cotton aphid (Aphid gossypii), and on the numbers of cotton buds and bolls in North China. The population densities of cotton bollworm and cotton aphid increased with increasing nitrogen fertilization during 1999 to 2000, but the differences between treatments were not significant (P > 0.05). There were significant differences of cotton bollworm populations and no significant differences of cotton aphid populations between years. Nitrogen fertilization at flower-bud stage decreased the loss of cotton buds and flowers and increased the number of effective bolls and cotton yield, but the decrement and increment did not get to significant level (P < 0.05). No obvious correlations of nitrogen levels with main pest abundance and cotton production were observed.
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Claims 9
Claim · model-written summary
Cotton bollworm density increased with increasing nitrogen fertilization, without a significant treatment difference.
- Taxon
- cotton
Gossypium hirsutume1 - Treatment
- increasing nitrogen fertilizatione0
- Interactor
- cotton bollworm
_gusano_cogollero.png?width=60)
Helicoverpa armigerae0pest - Outcome
- population densities of cotton bollworme0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_gusano_cogollero.png?width=500)
Verbatim
e0“The population densities of cotton bollworm and cotton aphid increased with increasing nitrogen fertilization during 1999 to 2000, but the differences between treatments were not significant (P > 0.05)”
e1“cotton bollworm (Helicoverpa armigera)”
Claim · model-written summary
Cotton aphid density increased with increasing nitrogen fertilization, without a significant treatment difference.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- increasing nitrogen fertilizatione0
- Interactor
- cotton aphid
Aphis gossypiie0pest - Outcome
- cotton aphide0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The population densities of cotton bollworm and cotton aphid increased with increasing nitrogen fertilization during 1999 to 2000, but the differences between treatments were not significant (P > 0.05)”
e1“cotton aphid (Aphid gossypii)”
Claim · model-written summary
Cotton bollworm populations differed significantly between years.
- Taxon
- cottonGossypium hirsutume0
- Interactor
- cotton bollwormHelicoverpa armigerae0pest
- Outcome
- cotton bollworm populationse0
- Comparator
- between yearse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were significant differences of cotton bollworm populations and no significant differences of cotton aphid populations between years”
Claim · model-written summary
Cotton aphid populations did not differ significantly between years.
- Taxon
- cottonGossypium hirsutume0
- Interactor
- cotton aphidAphis gossypiie0pest
- Outcome
- cotton aphid populationse0
- Comparator
- between yearse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were significant differences of cotton bollworm populations and no significant differences of cotton aphid populations between years”
Claim · model-written summary
Nitrogen fertilization at flower-bud stage decreased cotton bud and flower loss without reaching significance.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- Nitrogen fertilization at flower-bud stagee0
- Outcome
- loss of cotton buds and flowerse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization at flower-bud stage decreased the loss of cotton buds and flowers and increased the number of effective bolls and cotton yield, but the decrement and increment did not get to significant level (P < 0.05)”
Claim · model-written summary
Nitrogen fertilization at flower-bud stage increased effective boll number without reaching significance.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- Nitrogen fertilization at flower-bud stagee0
- Outcome
- number of effective bollse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization at flower-bud stage decreased the loss of cotton buds and flowers and increased the number of effective bolls and cotton yield, but the decrement and increment did not get to significant level (P < 0.05)”
Claim · model-written summary
Nitrogen fertilization at flower-bud stage increased cotton yield without reaching significance.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- Nitrogen fertilization at flower-bud stagee0
- Outcome
- cotton yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization at flower-bud stage decreased the loss of cotton buds and flowers and increased the number of effective bolls and cotton yield, but the decrement and increment did not get to significant level (P < 0.05)”
Claim · model-written summary
Nitrogen levels showed no obvious correlation with main pest abundance.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- nitrogen levelse0
- Outcome
- main pest abundancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No obvious correlations of nitrogen levels with main pest abundance and cotton production were observed”
Claim · model-written summary
Nitrogen levels showed no obvious correlation with cotton production.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- nitrogen levelse0
- Outcome
- cotton productione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No obvious correlations of nitrogen levels with main pest abundance and cotton production were observed”
The same questions in other papers
fertilization · Aphis gossypii · Gossypium hirsutum (cotton)Positive and negative results
2 in the opposite direction
- positive
- positive
fertilization · phenology · Gossypium hirsutum (cotton)Positive and negative results
14 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- negative
- negative
14 papers more in this group
See all 18 papers →fertilization · yield · Gossypium hirsutum (cotton)Positive and negative results
496 papers in the same direction as this paper · 47 in the opposite direction · 6 reporting no difference from an alternative
- no effect
- no effect
- negative
546 papers more in this group
See all 550 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.