Abstract
The presence of biologically active substances (BAS) in biosolids may enhance plant stress tolerance and growth, but the underlying mechanisms are not well understood. This greenhouse study investigated the effects of two biosolids: Alexandria (anaerobically digested; Class A product from the Alexandria Sanitation Authority Wastewater Treatment Facility in Alexandria, VA) and Blue Plains (lime-stabilized; Class B product from Washington, DC, Water and Sewer Authority) on tall fescue [ Lolium arundinaceum (Schreb.) S.J. Darbyshire] antioxidant enzyme activity associated with drought resistance. Treatments included a fertilizer control, Alexandria (11.9 g·kg −1 soil) and Blue Plains (17.6 g·kg −1 soil) biosolids to match the nitrogen in the control. Tall fescue physiological responses were measured under well-watered or drought-stressed conditions. Drought stress reduced turfgrass quality, photochemical efficiency (PE), and catalase (CAT) activity while increasing superoxide dismutase (SOD), ascorbate peroxidase (APX), and peroxidase (POD) activities. The two biosolids improved turfgrass quality and root mass under both soil moisture regimes and delayed leaf wilting during moisture stress. The biosolids also improved PE, SOD, and APX activities relative to the control under both soil moisture regimes. The data suggest that biosolids application may improve antioxidant enzyme activity and subsequent drought resistance.
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Claims 5
Claim · model-written summary
Drought reduced turfgrass quality, photochemical efficiency and catalase activity.
- Taxon
- Tall fescue
Lolium arundinaceumt0 - Treatment
- Drought stresse0
- Outcome
- turfgrass quality, photochemical efficiency (PE), and catalase (CAT) activitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress reduced turfgrass quality, photochemical efficiency (PE), and catalase (CAT) activity while increasing superoxide dismutase (SOD), ascorbate peroxidase (APX), and peroxidase (POD) activities.”
t0“Tall Fescue”
Claim · model-written summary
Drought increased SOD, APX and POD activities.
- Taxon
- Tall fescueLolium arundinaceumt0
- Treatment
- Drought stresse0
- Outcome
- superoxide dismutase (SOD), ascorbate peroxidase (APX), and peroxidase (POD) activitiese0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress reduced turfgrass quality, photochemical efficiency (PE), and catalase (CAT) activity while increasing superoxide dismutase (SOD), ascorbate peroxidase (APX), and peroxidase (POD) activities.”
t0“Tall Fescue”
Claim · model-written summary
Both biosolids improved turfgrass quality and root mass under both moisture regimes.
- Taxon
- Tall fescueLolium arundinaceumt0
- Treatment
- two biosolidse0
- Outcome
- turfgrass quality and root masse0
- Direction
- improvede0
- Qualifier
- both soil moisture regimese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two biosolids improved turfgrass quality and root mass under both soil moisture regimes and delayed leaf wilting during moisture stress.”
t0“Tall Fescue”
Claim · model-written summary
Both biosolids delayed leaf wilting during moisture stress.
- Taxon
- Tall fescueLolium arundinaceumt0
- Treatment
- two biosolidse0
- Outcome
- leaf wiltinge0
- Direction
- delayede0
- Qualifier
- during moisture stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two biosolids improved turfgrass quality and root mass under both soil moisture regimes and delayed leaf wilting during moisture stress.”
t0“Tall Fescue”
Claim · model-written summary
Both biosolids improved PE, SOD and APX activities relative to control under both moisture regimes.
- Taxon
- Tall fescueLolium arundinaceumt0
- Treatment
- biosolidse0
- Outcome
- PE, SOD, and APX activitiese0
- Direction
- improvede0
- Qualifier
- both soil moisture regimese0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The biosolids also improved PE, SOD, and APX activities relative to the control under both soil moisture regimes.”
t0“Tall Fescue”
The same questions in other papers
drought · physiology: photosynthesis · Lolium arundinaceum (tall fescue)Positive and negative results
4 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
3 papers more in this group
See all 7 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.