Abstract
Abstract Soil nutrients can influence the population dynamics of arthropod pests and their natural enemies. Previous research has revealed that overfertilization increases the likelihood of pest outbreak in a subsequent soybean [ Glycine max (L.) Merr.] crop following winter wheat ( Triticum aestivum L.). Improving biological control from natural enemies is an important aspect of integrated pest management. Our objectives in this field study were to (i) determine the effect of soil nutrition on population densities of the predators Geocoris spp. (bigeyed bugs), Nabis and Hoplistoscelis spp. (damsel bugs), and spiders (Araneae) in a soybean canopy and (ii) relate densities of each predator to pest densities and determine if previously reported effects of overfertilization on pest densities were the indirect result of influences of soil nutrients on predator populations. Soil nutrient levels were four levels of P and three levels of K and Mg. The study was conducted in 1986 and 1987. High P favored population density of damsel bug nymphs in 1986 only, but populations were not significantly affected by K or Mg. High P significantly affected population densities of bigeyed bug nymphs each year. Density estimates of spiders were significantly increased by P only in 1986. Densities of spiders were not affected by K and Mg either year. Increased pest outbreaks from overfertilization of soybean were not the result of fertility effects on population densities of these major predators.
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Claims 6
Claim · model-written summary
High phosphorus favored damsel bug nymph density in 1986 only.
- Taxon
- soybean
Glycine maxe1 - Treatment
- High Pe0
- Interactor
- damsel bug nymphse0other
- Outcome
- population density of damsel bug nymphse0
- Direction
- favorede0
- Qualifier
- 1986 onlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High P favored population density of damsel bug nymphs in 1986 only”
e1“soybean canopy”
Claim · model-written summary
Potassium and magnesium did not significantly affect damsel bug nymph populations.
- Taxon
- soybeanGlycine maxe2
- Treatment
- K or Mge0
- Outcome
- populationse0
- Direction
- not significantly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“populations were not significantly affected by K or Mg”
e1“damsel bug nymphs in 1986 only”
e2“soybean canopy”
Claim · model-written summary
High phosphorus significantly affected bigeyed bug nymph density each year.
- Taxon
- soybeanGlycine maxe1
- Treatment
- High Pe0
- Interactor
- bigeyed bug nymphse0other
- Outcome
- population densities of bigeyed bug nymphse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High P significantly affected population densities of bigeyed bug nymphs each year”
e1“soybean canopy”
Claim · model-written summary
Phosphorus significantly increased spider density in 1986 only.
- Taxon
- soybeanGlycine maxe1
- Treatment
- Pe0
- Outcome
- Density estimates of spiderse0
- Direction
- increasede0
- Qualifier
- 1986e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Density estimates of spiders were significantly increased by P only in 1986”
e1“soybean canopy”
Claim · model-written summary
Potassium and magnesium did not affect spider densities in either year.
- Taxon
- soybeanGlycine maxe1
- Treatment
- K and Mge0
- Outcome
- Densities of spiderse0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Densities of spiders were not affected by K and Mg either year”
e1“soybean canopy”
Claim · model-written summary
The authors concluded that predator-density changes did not explain pest outbreaks from soybean overfertilization.
- Taxon
- soybeanGlycine maxe0
- Outcome
- Increased pest outbreakse0
- Qualifier
- not the result of fertility effects on population densities of these major predatorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased pest outbreaks from overfertilization of soybean were not the result of fertility effects on population densities of these major predators”
The same questions in other papers
magnesium atom · pest · Glycine max (soybean)Positive and negative results
1 in the opposite direction
- positive
phosphorus · pest · Glycine max (soybean)Positive and negative results
6 papers in the same direction as this paper · 1 reporting no difference from an alternative
- no effect
- positive
- positive
4 papers more in this group
See all 8 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.