Abstract
Multispectral radiometry resolutely quantifies canopy attributes of similarly managed monocultures over wide and varied temporal arrays. Likewise, liquid phthalocyanine-containing products are commonly applied to turfgrass as a spray pattern indicator, dormancy colourant, and/or product synergist. While perturbed multispectral radiometric characterization of putting greens within 24 h of treatment by synthetic phthalocyanine colourant has been reported, explicit guidance on subsequent use is absent from the literature. Our objective was to assess creeping bentgrass (Agrostis stolonifera L. ‘Penn G2’) putting green reflectance and growth one to 14 d following semi-monthly treatment by synthetic Cu II phthalocyanine colourant (Col) and petroleum-derived spray oil (PDSO) combination product at a 27 L ha−1 rate and/or 7.32 kg ha−1 soluble N treatment by one of two commercial liquid fertilizers. As observed in a bentgrass fairway companion study, mean daily shoot growth and canopy dark green colour index (DGCI) increased with Col+PDSO complimented N treatment. Yet contrary to the fairway study results, deflated mean normalized differential red edge (NDRE) or vegetative index (NDVI) resulted from an associated Col+PDSO artefact that severely impeded near infrared (810-nm) putting green canopy reflectance. Regardless of time from Col+PDSO combination product treatment, the authors strongly discourage turfgrass scientists from employing vegetative indices that rely on 760- or 810-nm canopy reflectance when evaluating such putting green systems.
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Claims 4
Claim · model-written summary
Colourant and spray oil with nitrogen increased daily shoot growth.
- Taxon
- creeping bentgrass
Agrostis stoloniferat0 - Treatment
- Col+PDSO complimented N treatmente0
- Outcome
- mean daily shoot growthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mean daily shoot growth and canopy dark green colour index (DGCI) increased with Col+PDSO complimented N treatment.”
t0“creeping bentgrass (Agrostis stolonifera L. ‘Penn G2’)”
Claim · model-written summary
Colourant and spray oil with nitrogen increased canopy dark green colour index.
- Taxon
- creeping bentgrassAgrostis stoloniferat0
- Treatment
- Col+PDSO complimented N treatmente0
- Outcome
- canopy dark green colour index (DGCI)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mean daily shoot growth and canopy dark green colour index (DGCI) increased with Col+PDSO complimented N treatment.”
t0“creeping bentgrass (Agrostis stolonifera L. ‘Penn G2’)”
Claim · model-written summary
The colourant and spray oil artefact depressed red-edge and vegetation indices by impeding near-infrared reflectance.
- Taxon
- creeping bentgrassAgrostis stoloniferat0
- Treatment
- Col+PDSOe0
- Outcome
- mean normalized differential red edge (NDRE) or vegetative index (NDVI)e0
- Direction
- deflatede0
- Qualifier
- near infrared (810-nm) putting green canopy reflectancee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deflated mean normalized differential red edge (NDRE) or vegetative index (NDVI) resulted from an associated Col+PDSO artefact that severely impeded near infrared (810-nm) putting green canopy reflectance.”
t0“creeping bentgrass (Agrostis stolonifera L. ‘Penn G2’)”
Claim · model-written summary
The authors discourage use of indices based on 760- or 810-nm reflectance in treated putting greens.
- Taxon
- creeping bentgrassAgrostis stoloniferat0
- Outcome
- employing vegetative indices that rely on 760- or 810-nm canopy reflectancee0
- Qualifier
- such putting green systemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the authors strongly discourage turfgrass scientists from employing vegetative indices that rely on 760- or 810-nm canopy reflectance when evaluating such putting green systems.”
t0“creeping bentgrass (Agrostis stolonifera L. ‘Penn G2’)”
The same questions in other papers
application · growth · Agrostis stolonifera (creeping bent grass)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- positive
- no effect
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See all 6 papers →nitrogen · quality: postharvest · Agrostis stolonifera (creeping bent grass)Results agree
1 paper in the same direction as this paper
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application · quality: postharvest · Agrostis stolonifera (creeping bent grass)Results agree
2 papers in the same direction as this paper
- positive
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nitrogen · growth · Agrostis stolonifera (creeping bent grass)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.