tillage
Enable an agent to recognise a tillage operation, record its soil disturbance and agricultural purpose, assess its condition and consequences, and identify whether further intervention is justified.
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 a tillage operation, record its soil disturbance and agricultural purpose, assess its condition and consequences, and identify whether further intervention is justified.
Tillage is the mechanical manipulation of soil for crop production, undertaken to alter seedbed conditions, manage weeds and residues, or modify the soil's physical condition.
It can be Identify a soil-working event and distinguish it from planting, traffic or non-agricultural earthmoving; Compare proposed tillage options against an explicit field objective and observed soil conditions; Map treated strips, depths, missed areas and overlapping passes; Assess whether the observed seedbed, residue or compaction outcome meets the stated objective; Flag evidence supporting deferral, adjustment or avoidance of an additional pass; Compare tillage regimes using declared definitions and measured disturbance.
Distinguishing features
An instance intentionally works soil mechanically for an agricultural purpose; spraying, mowing and residue removal without soil working do not qualify.
The model describes an activity or sequence of activities; a plough, cultivator or harrow is a participating implement rather than an instance of tillage.
Soil disturbance during planting must be identified separately from any distinct tillage pass; the presence of a seed opener alone does not establish a separate tillage operation.
No-till is a management designation concerning the absence or restriction of tillage, not a soil-working operation itself; any permitted local disturbance needs the designation's stated definition.
A tillage-regime label does not establish actual disturbance: recognition requires evidence of the soil-working action, its depth and its spatial extent.
Scope
+ The agricultural purpose, location, timing and extent of a tillage operation
+ Mechanical actions on soil, including cutting, loosening, inversion, mixing and consolidation within a tillage sequence
+ Working depth, disturbed area, pass sequence and treatment of surface residues
+ Soil and field conditions affecting whether an operation can achieve its purpose
+ Observed outcomes, adverse effects and decisions about subsequent tillage
- Design, manufacture and maintenance of tractors and tillage implements
- Soil classification and soil development independent of a tillage intervention
- Whole-farm crop rotations and agricultural business management
- Chemical weed control and fertiliser formulation
- Earthmoving for construction, mining or landscape grading
Characteristics
- Agricultural objective
- Seedbed preparation; weed control; residue incorporation; amendment incorporation; compaction alleviation; other stated objective; multiple objectives Success and acceptable side effects depend on what the operation is intended to accomplish.
- Soil-working action
- Cutting; loosening; inversion; mixing; pulverisation; consolidation; combinations Actions distinguish operations whose implement names or regime labels may otherwise conceal different effects.
- Working depth
- cm below the pre-operation soil surface, with target, observed range and measurement method distinguished Depth identifies the soil zone affected and whether the intended target was reached.
- Disturbed surface fraction
- % of the defined treatment area, with strip or patch geometry recorded Localised and full-width working can have similar depths but substantially different spatial footprints.
- Residue cover change
- % surface cover before and after the operation, with sampling method Records the actual residue outcome instead of inferring it from the operation's name.
- Soil workability
- Unassessed; suitable; marginal; unsuitable for the specified operation, supported by moisture and soil-condition observations An operation's suitability depends on current conditions and the intended result.
- Position in the field-operation sequence
- Links to preceding and following tillage passes, planting, harvest and relevant field treatments Repeated passes and their timing can alter both the result and the need for further disturbance.
- Operation status
- Proposed; scheduled; underway; completed; interrupted; deferred; cancelled Separates intentions from executed disturbance and supports appropriate next actions.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 16 findings · 24 questions.
Tillage purpose and boundaries Establishes what agricultural problem the soil working addresses and which activity or regime is being described.
Tillage cannot be judged from an implement name or management label without identifying its purpose and operational boundary.
Agricultural purpose
Connects the proposed disturbance to a specific field need.
Target condition and success
Record the condition motivating tillage and the observable result sought, separating multiple objectives when they conflict.
- What observed field condition motivates tillage: an unsuitable seedbed, weeds, residue placement, a restrictive soil layer or another problem? definition
- What field observation would establish that the objective has been achieved without another pass? measurement
Operation and regime boundary
Separates a soil-working pass from the longer management regime and adjacent agricultural activities.
Declared tillage instance
Identify whether the subject is a single pass, a combined operation or a regime over a stated period, and preserve the definitions behind any classification.
- Does this record cover one pass, a combined planting-and-tillage operation or a sequence across a crop season? boundary
- Whose definition supports labels such as conventional, reduced, conservation, strip or no-till, and what disturbance does that definition permit? provenance
Soil disturbance pattern Describes how soil and residues are physically worked across depth and area.
The physical disturbance provides a more interpretable description than equipment or regime labels alone.
Soil action and depth
Identifies the mechanical action and the soil zone it actually affects.
Observed working profile
Distinguish intended settings from observed depth, inversion, mixing, loosening and clod alteration.
- Which soil-working actions occurred, and what observations distinguish them from the implement's nominal function? definition
- What working depth and variation were observed across the pass, and how do they relate to the target soil layer? measurement
Surface pattern and residues
Records where disturbance occurs and how it changes surface protection and residue placement.
Disturbance and residue footprint
Capture full-width, strip or patch disturbance, untreated areas, overlap and observed residue redistribution.
- What fraction of the treatment area was disturbed, and what strip widths, spacing, overlaps or missed areas define that footprint? measurement
- How did measured surface residue cover and residue placement change between comparable observations before and after tillage? measurement
Workability and pass decisions Connects soil condition, field exposure and operation sequence to decisions about carrying out tillage.
The same soil-working action may be suitable or counterproductive under different field conditions and timings.
Soil readiness
Examines whether the target soil zone can be worked into the desired condition.
Operation-specific workability
Assess moisture, soil consistency, existing structure and restrictive layers using evidence appropriate to the proposed operation.
- What moisture and soil-consistency observations are available at working depth, and where within the field were they taken? measurement
- What observed conditions would require deferring or changing this operation to avoid smearing, excessive clodding or unwanted pulverisation? action
Timing and repeat passes
Places tillage within the crop-operation sequence and the period of soil exposure it creates.
Necessity of the next pass
Record why another pass is needed, its relationship to planting and prior passes, and the conditions under which it can be omitted.
- What unmet objective remains after previous passes, and could the next scheduled operation meet it without a separate tillage pass? action
- How do expected weather, slope, remaining cover and the interval before crop establishment affect the proposed timing? action
Tillage outcomes and evidence Evaluates achieved field conditions, unintended effects and the strength of evidence linking changes to tillage.
Completion of a pass does not establish agricultural benefit, and later field changes may have several causes.
Immediate field result
Checks the intended result at a time and scale appropriate to the operation.
Objective-matched verification
Use observations matched to the purpose, such as seedbed condition, weed response, incorporation or alteration of a restrictive layer.
- Which observations demonstrate the intended result, and were they taken soon enough or late enough to detect that result? measurement
- Where did the operation fail to achieve its objective, and does the evidence justify local correction, another method or no further disturbance? action
Unintended and persistent effects
Tracks adverse effects and longer-term changes while distinguishing observation from causal attribution.
Effects and attribution limits
Record evidence of erosion, crusting, compaction, moisture changes or persistent structural changes, together with relevant alternative explanations.
- What post-operation observations indicate unwanted soil movement, surface sealing, compaction or moisture change, and how do they compare with a baseline? measurement
- What comparison or monitoring history separates the contribution of tillage from machinery traffic, weather, crop cover and other management? provenance
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 describes the agricultural activity, not land designated as tillage land.
- The listed kinds overlap: primary and secondary describe operational roles, while inversion, reduced, and strip tillage describe different aspects of disturbance.
- Depth ranges are illustrative; verify local practice definitions and the current NRCS standard before using them for classification or compliance.
- Which of these check these first hold for the sense of tillage this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Primary tillage
- Secondary tillage
- Inversion tillage
- Non-inversion tillage
- Reduced tillage
- Strip tillage
- Which of these kinds and varieties hold for the sense of tillage this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- USDA Natural Resources Conservation Service Conservation Practice Standard 345, Residue and Tillage Management, Reduced Till, addresses reduced-tillage management in the United States.
- Which of these standards and regulation hold for the sense of tillage this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Preparing a seedbed for sowing and crop establishment.
- Controlling weeds mechanically before planting or between crop rows.
- Incorporating crop residues, manure, fertilizers, or soil amendments.
- Loosening compacted soil where a diagnosed restrictive layer warrants intervention.
- Forming beds, ridges, or furrows for crop production and water management.
- Which of these real-world use hold for the sense of tillage this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Working depth for shallow seedbed cultivation - Approximately 5-15; varies with implement, crop, and soil conditions - cm
- Working depth for conventional primary tillage - Approximately 15-30; deep loosening can extend below this range - cm
- Soil surface covered by crop residue after an operation - 0-100; a measurement scale rather than a recommended operating range - %
- Which of these typical measurements hold for the sense of tillage 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.
- Leaving soil exposed can increase wind and water erosion.
- Repeated intensive disturbance can degrade aggregates and accelerate soil organic matter loss.
- Working wet soil can cause smearing and compaction; repeated operations at similar depths can contribute to a tillage pan.
- Excessive pulverization can promote surface crusting, while disturbance can increase evaporative water loss.
- Powered implements present entanglement, crushing, and struck-object hazards.
- Which of these failure modes and hazards hold for the sense of tillage this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Dryland systems often prioritize moisture conservation and residue retention, which can favor reduced disturbance.
- Puddling is used in many flooded rice systems to prepare soil and reduce water percolation, unlike typical upland seedbed preparation.
- Definitions and eligibility criteria for conservation or reduced tillage vary among jurisdictions and agricultural programs.
- Which of these regional variation hold for the sense of tillage 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.
- No-till - No-till establishes crops without general seedbed tillage, usually allowing localized soil disturbance for seed and fertilizer placement.
- Ploughing - Ploughing is a particular tillage operation; tillage also includes operations such as harrowing, cultivation, and ripping.
- Cultivation - Cultivation can mean crop growing broadly or a specific soil-working operation; only the latter meaning substantially overlaps with tillage.
- Conservation agriculture - Conservation agriculture combines minimal soil disturbance, soil cover, and crop diversification; tillage describes soil-working operations rather than the whole production system.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of tillage this model covers, and on what evidence? provenance
What the second pass must settle
- Which authoritative definitions should govern tillage-regime labels across regions, particularly conservation tillage, strip-till and disturbance permitted within no-till?
- Where should this registry place rolling, puddling, planting-associated soil disturbance and mechanical weeding at the boundary of tillage?
- Which field methods and locally validated criteria adequately assess workability and successful loosening for different soils and implements?
- What monitoring duration and comparison design are needed to attribute persistent changes in soil structure, erosion or soil carbon to a tillage regime?
- Does an existing Vercy world model already own this agricultural activity, requiring this registry entry to link to that model?