Abstract
An experiment was conducted at Gurjangjhora Tea Estate, Malbazar, Jalpaiguri during kharif seasons of 2013 and 2014 to find out the efficacy of non-selective ammonium salt of glyphosate 71% SG on weed dynamics in tea and its effect on soil microflora. The experiment was laid out in randomized block design and replicated thrice. The treatment comprised of seven herbicidal treatments viz. ammonium salt of glyphosate 710, 1420, 2130 g a.i. ha-1, standard glyphosate 2130 g a.i. ha-1 and paraquat dichloride 2130 g a.i. ha-1, HW at 20 and 40 days after application besides weedy check. Both the weed density and biomass at 40 and 60 days after application of all the weed control treatments were significantly lower than weedy check. Ammonium salt of glyphosate (71% SG) 2130 g ha-1 proved significantly better for controlling the major pre-dominant tea weed i.e. Cyperus rotundus and Borreria hispida. The higher WCE (90.28%) was recorded under hand-weeding and ammonium salt of glyphosate (71% SG) 2130 g ha-1 (89.10%) at 60 DAS followed by its lower doses. The resurgence of weed flora was observed after two months of application. Herbicides did not show any phytotoxicity symptoms on the matured tea plants throughout the observation period. The herbicidal treatments showed initial detrimental effect on soil microbial (total bacteria, fungi and actinomycetes) population, but no harmful effects were recorded after one month of application.
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Claims 8
Claim · model-written summary
All weed-control treatments reduced weed density and biomass at 40 and 60 days relative to the weedy check.
- Taxon
- Teat0
- Treatment
- all the weed control treatmentse0
- Interactor
- weede0weed
- Outcome
- weed density and biomasse0
- Direction
- lowere0
- Comparator
- weedy checke0
Not reportedOrgan / stage
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“Both the weed density and biomass at 40 and 60 days after application of all the weed control treatments were significantly lower than weedy check.”
Claim · model-written summary
Ammonium salt of glyphosate at 2130 g ha-1 controlled Cyperus rotundus significantly better.
- Taxon
- Teat0
- Treatment
- Ammonium salt of glyphosate (71% SG) 2130 g ha-1e0
- Interactor
- Cyperus rotundus
Cyperus rotunduse0weed - Outcome
- controlling the major pre-dominant tea weed i.e. Cyperus rotunduse0
- Direction
- bettere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“Ammonium salt of glyphosate (71% SG) 2130 g ha-1 proved significantly better for controlling the major pre-dominant tea weed i.e. Cyperus rotundus and Borreria hispida.”
Claim · model-written summary
Ammonium salt of glyphosate at 2130 g ha-1 controlled Borreria hispida significantly better.
- Taxon
- Teat0
- Treatment
- Ammonium salt of glyphosate (71% SG) 2130 g ha-1e0
- Interactor
- Borreria hispidaSpermacoce neohispidae0weed
- Outcome
- controlling the major pre-dominant tea weed i.e. Cyperus rotundus and Borreria hispidae0
- Direction
- bettere0
Not reportedComparator
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“Ammonium salt of glyphosate (71% SG) 2130 g ha-1 proved significantly better for controlling the major pre-dominant tea weed i.e. Cyperus rotundus and Borreria hispida.”
Claim · model-written summary
Hand-weeding had weed-control efficacy of 90.28% at 60 DAS.
Not reportedComparator
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“The higher WCE (90.28%) was recorded under hand-weeding and ammonium salt of glyphosate (71% SG) 2130 g ha-1 (89.10%) at 60 DAS followed by its lower doses.”
Claim · model-written summary
Ammonium salt of glyphosate at 2130 g ha-1 had weed-control efficacy of 89.10% at 60 DAS.
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“The higher WCE (90.28%) was recorded under hand-weeding and ammonium salt of glyphosate (71% SG) 2130 g ha-1 (89.10%) at 60 DAS followed by its lower doses.”
Claim · model-written summary
Weed flora resurged after two months of application.
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“The resurgence of weed flora was observed after two months of application.”
Claim · model-written summary
Herbicides caused no observed phytotoxicity symptoms in mature tea plants.
- Taxon
- teae0
- Organ / stage
- matured tea plantse0
- Treatment
- Herbicidese0
- Outcome
- phytotoxicity symptomse0
- Direction
- did not showe0
Not reportedComparator
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“Herbicides did not show any phytotoxicity symptoms on the matured tea plants throughout the observation period.”
Claim · model-written summary
Herbicide treatments initially harmed soil microbial populations, but no harmful effects remained after one month.
- Taxon
- Teat0
- Treatment
- herbicidal treatmentse0
- Outcome
- soil microbial (total bacteria, fungi and actinomycetes) populatione0
- Direction
- initial detrimental effecte0
- Qualifier
- no harmful effects were recorded after one month of applicatione0
Not reportedComparator
Verbatim
t0“Tea (Camellia sinensis L.)”
e0“The herbicidal treatments showed initial detrimental effect on soil microbial (total bacteria, fungi and actinomycetes) population, but no harmful effects were recorded after one month of application.”
The same questions in other papers
glyphosate · weed · Camellia sinensis (black tea)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
1 paper more in this group
See all 5 papers →glyphosate · Spermacoce neohispida · Camellia sinensis (black tea)Results agree
1 paper in the same direction as this paper
- positive
herbicide · crop injury · Camellia sinensis (black tea)Positive and negative results
1 in the opposite direction
- no effect
herbicide · weed · Camellia sinensis (black tea)Results agree
2 papers in the same direction as this paper
- 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.