grass
narrow-leaved green herbage: grown as lawns; used as pasture for grazing animals; cut and dried as hay
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise grass as living herbage, assess its condition and suitability for lawn, grazing or hay use, and identify appropriate management actions.
Grass is narrow-leaved herbaceous vegetation composed principally of plants in the family Poaceae, considered collectively as living ground cover or herbage grown for lawns, grazed as pasture, or harvested and dried as hay.
It can be Identify or provisionally classify grass and document uncertainty about grass-like plants.; Survey grass cover, composition, growth stage and available herbage.; Assess suitability for lawn use, grazing or hay cutting against explicit local criteria.; Plan mowing, grazing, rest or harvest using growth state and removal history.; Evaluate whether watering, reseeding or restricted access is justified by observed conditions.; Track regrowth and stand recovery after management or damage..
Distinguishing features
Check leaf, sheath, stem-node and reproductive structures together when distinguishing grasses from sedges, rushes and other narrow-leaved plants; appearance alone leaves identification provisional.
Record whether the subject is herbage, an individual plant or a mixed stand; the common name grass does not establish a species identity.
Distinguish a lawn from pasture through intended use and management history, since short green cover alone does not establish either use.
Distinguish attached, living herbage from cut material and cured hay through harvest and drying state.
Treat green colour and narrow leaves as recognition clues rather than mandatory condition tests, so dormant, flowering or senescent grass remains representable.
Scope
+ Recognition of grass herbage and distinction from grass-like plants
+ Species composition and identification uncertainty within a grass stand
+ Growth, reproduction, seasonal activity and regrowth after cutting or grazing
+ Stand cover, biomass, rooting conditions and signs of stress
+ Suitability and management for lawns, pasture and hay production
+ The transition from standing grass to cut herbage intended for hay
- Complete taxonomic accounts and conservation assessments of individual grass species
- Whole grassland ecosystems and their associated animal communities
- Livestock health, complete diets and grazing enterprise economics
- Detailed hay curing, storage, grading and trade after harvest
- Cereal grain production, bamboo timber and other specialised grass-family products
- Artificial turf and landscape construction systems
Characteristics
- Observation subject
- individual plant | patch | managed stand | cut herbage Prevents plant-level identification from being confused with stand-level condition or harvest measurements.
- Botanical composition
- identified taxa with identification evidence, confidence and estimated contribution Grass can contain several species with different growth patterns and management requirements.
- Intended use
- lawn | pasture | hay crop | multiple uses | unspecified Determines which condition measures and actions are relevant.
- Canopy height
- cm, with sampling method and date Supports mowing, grazing and harvest decisions when interpreted against species and use.
- Ground cover composition
- percent grass cover, other vegetation, bare ground and litter using a stated method Distinguishes a dense grass stand from sparse growth or a mixed vegetation surface.
- Above-ground dry matter
- kg dry matter/ha, with sampling area, cutting height and date Quantifies herbage availability without confusing water content with usable biomass.
- Growth and reproductive state
- establishing | vegetative | flowering | seed-bearing | dormant | senescent | mixed Helps interpret appearance, recovery potential and suitability for the intended use.
- Root-zone moisture
- volumetric water content (%) or a defined field moisture class, with depth and date Provides context for growth restriction, irrigation and access decisions.
- Defoliation history
- dated mowing, grazing or cutting events with removal intensity and residual height Connects current condition to recent removal and the time available for recovery.
- Stress and damage observations
- observed discoloration, wilting, thinning, lesions, uprooting or trampling; extent and suspected cause recorded separately Supports investigation without presenting a visual symptom as a confirmed diagnosis.
Analytical facets
- substance
- living
- origin
- natural
- agency
- inert
- mobility
- not-applicable
- scale
- not-applicable
- affordances
- observable
Also called
+371
Where this came from
oewn:2024 · CC BY 4.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 19 findings · 29 questions.
Grass identity and boundaries Establish what is being called grass and at which biological or material scale.
The registry describes herbage rather than a single taxon, so an agent must resolve identity and scale before interpreting observations.
Botanical recognition
Record evidence distinguishing grass from similar-looking vegetation.
Grass identification evidence
Require observable identification evidence and allow unresolved grass-like plants to remain provisional.
- Which leaf, sheath, node or reproductive features support identifying this vegetation as grass rather than a sedge, rush or other narrow-leaved plant? definition
- Who or what identified the grass, when, and from which specimen, photograph or identification resource? provenance
Herbage and stand boundaries
Separate individual plants, mixed stands and harvested material.
Observation unit and composition
Attach observations to an explicit plant, patch, stand or cut-material unit without implying that the unit contains one species.
- Does this record describe an individual grass plant, a bounded stand or cut herbage, and how is that unit delimited? boundary
- Which identified grasses, other plants and unresolved components occur within the unit, and how was their contribution estimated? measurement
Grass growth and renewal Represent establishment, seasonal development and recovery after herbage removal.
Grass management repeatedly removes foliage, making growth state and renewal central to judging what may happen next.
Seasonal and reproductive development
Track the observed development of the grasses present.
Growth stage and seasonal activity
Record active growth, reproduction, dormancy and senescence separately from simple greenness.
- What proportion of the grass is establishing, vegetative, flowering, seed-bearing, dormant or senescent at the observation date? measurement
- What species-specific and local seasonal evidence is needed to distinguish dormancy from decline or death? definition
Defoliation and regrowth
Relate mowing, grazing and cutting to subsequent recovery.
Removal and recovery record
Pair the amount and timing of herbage removal with observed regrowth and surviving cover.
- When was grass last mown, grazed or cut, and what residual height and cover remained? provenance
- What measured regrowth and locally justified recovery criterion support another removal or a longer rest? action
Grass site and condition Connect the condition of grass cover to its growing environment and physical disturbance.
Similar-looking thinning or discoloration can arise under different site conditions and require different responses.
Root zone and exposure
Record the immediate conditions in which the grass grows.
Growing condition evidence
Capture moisture, soil and exposure observations relevant to the grasses present.
- What root-zone moisture, drainage, soil condition and light exposure were measured or observed in the grass patch? measurement
- Which site observations justify testing a watering, drainage, soil or shade explanation for the observed grass condition? action
Cover loss and damage
Track bare patches, damaged foliage and disturbance without assuming their cause.
Grass damage pattern
Describe the extent and spatial pattern of grass damage and distinguish symptoms from diagnosed causes.
- How much grass cover is thinning, discoloured, wilted, uprooted or otherwise damaged, and where are the affected patches? measurement
- What additional evidence is needed before attributing that pattern to trampling, cutting, water stress, pests or disease? boundary
Grass use and herbage quality Evaluate standing grass against lawn, pasture and hay-production purposes.
A condition desirable for one grass use may be unsuitable for another, so quality must be tied to the intended use.
Lawn function
Assess grass as maintained ground cover for a stated lawn use.
Lawn service condition
Judge lawn grass using explicit expectations for cover, height, appearance and use-related wear.
- What lawn function is intended, and which cover, height and wear criteria define acceptable grass condition for it? definition
- Do current grass cover and recovery observations support mowing, reseeding, continued access or temporary rest? action
Pasture and hay crop
Assess herbage availability and evidence of suitability for grazing or cutting.
Available and suitable herbage
Keep biomass estimates separate from feed suitability and link the latter to relevant analyses and intended animals.
- How much standing dry matter is available above the proposed residual cutting or grazing height, and how was it sampled? measurement
- What composition, forage-analysis and contamination evidence is available to assess this grass for the intended grazing animals or hay use? provenance
Grass management and harvest Make grass-management decisions traceable and preserve identity when standing herbage is cut.
An agent needs to connect interventions to observed grass responses and recognise when responsibility transfers to a harvested-material model.
Intervention selection and follow-up
Connect proposed grass treatments to an explicit problem and a measurable response.
Grass management decision
Record why a particular intervention is appropriate for the stand, its intended use and its current growth conditions.
- Which observed grass condition supports mowing, grazing, resting, watering or reseeding, and what species or site constraints govern the choice? action
- Which changes in height, cover, biomass or damage will be checked, and when, to evaluate the intervention? measurement
Cut herbage handoff
Mark the transition from rooted vegetation to harvested herbage intended for hay.
Harvest origin and material state
Retain the source stand and cutting event while distinguishing freshly cut grass from material subsequently assessed as hay.
- From which grass stand and cutting event did this harvested herbage originate? provenance
- At what documented material state does the record transfer to the hay model, and which drying or storage questions remain with that model? boundary
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This is a collective vegetation sense, not a species, population or individual; a single binomial, native range or conservation assessment would be inappropriate.
- Species-level taxonomy, identifiers, life cycles and conservation status require the constituent species to be identified.
- The lawn-height range is illustrative; specific management requirements and applicable seed or forage regulations need local verification.
- Which of these check these first hold for the sense of grass this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Turf or lawn grasses
- Pasture grasses
- Grasses grown for hay
- Cool-season grasses
- Warm-season grasses
- Annual and perennial grasses
- Which of these kinds and varieties hold for the sense of grass this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Botanical scientific nomenclature - Poaceae; constituent species named by genus and specific epithet - Poaceae identifies the principal plant family, not this collective vegetation sense; grass here has no single species identifier.
- Which of these identifiers and schemes hold for the sense of grass this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- International Seed Testing Association (ISTA) International Rules for Seed Testing provide methods for testing grass seed lots, including purity and germination.
- Which of these standards and regulation hold for the sense of grass this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Lawns and recreational turf
- Pasture for grazing livestock
- Hay production for stored animal feed
- Soil cover and erosion control
- Habitat and food for wildlife
- Which of these real-world use hold for the sense of grass this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Maintained lawn height - Approximately 2-10 for many ordinary lawns; suitable height depends on species, season and use - cm
- Which of these typical measurements hold for the sense of grass this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Drought, heat, cold or waterlogging can reduce growth or kill susceptible grasses.
- Overgrazing and excessively close mowing can weaken plants and expose soil.
- Compaction can restrict rooting, water infiltration and aeration.
- Grass pollen can cause allergic reactions.
- Hay stored with excessive moisture can mold and undergo heating that creates a fire hazard.
- Which of these failure modes and hazards hold for the sense of grass this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Cool-season grasses commonly dominate managed turf and pasture in cooler climates; warm-season grasses are common in hotter climates.
- Species mixtures and management vary with rainfall, irrigation, soil conditions and grazing systems.
- Some introduced forage or turf grasses become invasive outside their native ranges.
- Which of these regional variation hold for the sense of grass this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Poaceae - Poaceae is a taxonomic family, including cereals and bamboos; the requested sense describes herbage and vegetation used as ground cover or forage.
- Lawn - A lawn is an area of maintained low vegetation; grass is the plant material that commonly forms it.
- Pasture - Pasture is land or vegetation used for grazing and may include legumes and other plants alongside grasses.
- Hay - Hay is cut, dried forage, which may contain grasses, legumes or both; living grass has not undergone this processing.
- Sedges and rushes - These can resemble grasses but belong to different botanical families, principally Cyperaceae and Juncaceae.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of grass this model covers, and on what evidence? provenance
What the second pass must settle
- Does the registry intend grass to include sedges and other grass-like herbage under the common-language definition, or restrict botanical membership to Poaceae?
- Which existing Vercy models already own grassland ecosystems, individual grass taxa, pasture and hay, and where should this entry link to avoid duplication?
- Which identification authorities and dated taxonomic identifiers should be required when constituent grass species are resolved?
- Which region-, species- and use-specific references should govern cutting height, grazing readiness, recovery periods and establishment targets?
- Which forage tests and harvest-state criteria are required for the intended animals, climate and hay-production context?