Table 3 List of variables extracted for the systematic review on GMHT crops

article_id

Unique identification number assigned to each publication

Integer

No

Author

Author(s) of the listed publication.

Text

No

Crop

Common and species name

Text

Yes

publication_year

Year of publication of study

Integer

No

citation

Citation, e.g. journal name, volume and page numbers

Text

No

title

Title of the publication

Text

No

author_affiliation

Type(s) of institutions/organisations that the author(s) are affiliated with

Text

Yes

author_institute

Institution of corresponding author (or of first author if no corresponding author was listed).

Text

No

funding

Funding source

Text

No

peer_reviewed

Indicates whether study was published in a peer reviewed journal.

string

yes

Location

Geoposition or region/country where field study was performed

string

yes

Site_info

Information on previous cropping, rotation, soil type, irrigation etc.

string

yes

expmt_num

Number of experiments within a study (e.g. different locations, years, etc.)

string

no

data_location

Figure number, table number or page number where means and variation were found.

string

no

was_data_scanned

Indicates whether figures were scanned to obtain data values.

YesNo

yes

GM trait

Herbicide tolerance gene engineered into the transgenic crop.

string

yes

Conv. herb

Conventional herbicide comparator treatment

string

yes

event

Transgenic event of the crop tested.

string

no

transgenic_hybrid_or_var

Transgenic hybrid or variety name.

string

no

nontransgenic _var

Non-transgenic comparator variety name.

string

no

Weed/plant_class

taxonomic class

string

yes

Weed/plant_sub class

Monocotyledon or dicotyledon

string

yes

plant_order

taxonomic order

string

yes

plant_family

taxonomic family

string

yes

plant_genus

taxonomic genus

string

yes

plant_species

taxonomic species

string

yes

plant_finest grouping

Finest level of taxonomic resolution reported for the plant(s).

string

yes

Annual/perennial

string

yes

Strata

Emergence/establishment E= early, M= midseason, L=late

string

yes

replicate_data_issues

Codes flag for non-independence to be considered for analyses: TGLE=taxonomic group lumped elsewhere; EMUE= experimental means used elsewhere; CMUE=control means used elsewhere;

string

yes

Plant _stage

Stage.

string

yes

field_location

Location of field(s) to the level of specificity provided by the author

string

no

number_of_fields

Number of fields as described by the author.

integer

no

cultivation

Cultivation practices used within the fields (notes on tillage, herbicides, etc.)

string

no

plot_size

Size of replicate plots (in hectares)

real

no

plot_size_explanation

Explanations for any calculations done to obtain plot size

string

no

is_plot_size_avg

Indicates whether the listed plot size is an average or an estimate

string

yes

was_study_randomized

Indicates whether the authors indicated that they randomly assigned replicates to treatments.

string

yes

planting_date

Date on which field plots were planted.

string

no

first_sample

Date on which first sample was taken

string

no

last_sample

Date on which last sample was taken

string

no

study_duration

More detailed description on study duration

string

no

herbicide_name

Brand name of herbicides used.

string

yes

herbicide_active_ingr

Active ingredient for herbicides used.

string

yes

_spray_rate

Amount of active ingredient per spray.

string

no

mechanism_of_herbicide_app

Indicates if herbicide was applied as spray, granule, LV,ULV

string

yes

num_of_herbicide_app

Number of herbicide applications.

real

no

is_num_of_herbicide_app_avg

Indicates if the number of herbicide applications is an average

string

yes

sampling_method_abbrev

Abbreviated description of sampling method

string

yes

sampling_method_detailed

Detailed description of sampling method.

string

no

sampling_frequency

Frequency of repeated samples per replicate field or plot.

string

yes

number_of_sample_days

The number of times that each replicate field or plot was repeatedly sampled over the duration of the experiment.

real

no

num_subsamples

Number of subsamples per true replicate.

real

no

response_variable_abbrev

Major category of response variable.

string

yes

response_variable_detailed

Detailed description of response variable.

string

no

true_control_sample_size

True sample size for control treatment.

real

no

true_expmtl_sample_size

True sample size for experimental treatment.

real

no

authors_control_sample_size

Sample size for the control treatment as stated by the author.

real

no

authors_expmtl_sample_size

Sample size for the experimental treatment as stated by the author.

real

no

seasonal_or_peak

Indicates whether values represent seasonal means across multiple sample days or means from peak days

string

yes

did-we-calc

Indicates whether we calculated the seasonal mean or peak days.

YesNo

yes

calc_method_seas_mean

Explains how we calculated the seasonal mean or peak days

string

yes

comparison_type

Indicates whether the comparison is with conventional treated HT or conventional treated control, minimum tillage vs conventional tillage

string

yes

control_mean

Mean for the control treatment.

real

no

expmtl_mean

Mean for the experimental treatment.

real

no

control_std_err

Standard error for the control treatment.

real

no

expmtl_std_err

Standard error for the experimental treatment.

real

no

control_std_dev

Standard deviation for the control treatment.

real

no

expmtl_std_dev

Standard deviation for the experimental treatment.

real

no

mean_unit

Unit of measurement for the response variable. E.g. weed/seed numbers, biomass, ground cover.

string

yes

statistical_test_used

Statistical test used by author.

string

yes

is_effect_significant

Indicates whether a significant effect was detected by the author.

string

yes

warning1

Space for remarks for this record

string

no