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22175 Demonstrate knowledge of soil properties and their effect on

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22175 Demonstrate knowledge of soil properties and their effect on

    22175 version 1

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    Demonstrate knowledge of soil properties and their effect on plant growth

Level 3

    Credits 10

    Purpose People credited with this unit standard are able to: describe the formation of

    soil; describe the soil water properties of soil; describe the chemical

    properties of soil; describe the biological properties of soil; and describe how

    modifying soil properties can influence plant growth.

Subfield Horticulture

    Domain Production Horticulture

    Status Registered

    Status date 25 July 2006

    Date version published 25 July 2006

    Planned review date 31 December 2011

    Entry information Open.

    Replacement information This unit standard and unit standard 22174 replaced unit

    standard 14, unit standard 33, unit standard 34, and unit

    standard 35.

    Accreditation Evaluation of documentation and visit by NZQA, industry

    and teaching professional in the same field from another

    provider.

    Standard setting body (SSB) New Zealand Horticulture Industry Training Organisation

    Accreditation and Moderation Action Plan (AMAP) reference 0032

    This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.

Special notes

    The New Zealand Soil Classification is used in this unit standard as the basis for describing soils in New Zealand. Information on the New Zealand Soil Classification is available at http://soils.landcareresearch.co.nz.

     ; New Zealand Qualifications Authority 2012

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    Elements and performance criteria

Element 1

Describe the formation of soil.

Performance criteria

    1.1 Soil formation is described in terms of major contributing factors and supported

    by examples.

    Range contributing factors may include but are not limited to parent

    material, climate, topography, organisms, time, aspect and

    vegetation.

    1.2 Soil profile formation is described in terms of main horizons and supported by

    examples.

    Range O, A, B, C horizons.

    1.3 Formation of soil texture and structure is described in terms of the influence on

    soil properties.

    Range properties water and air movement, pore space, structural

    stability, soil warming, nutrient retention and leaching, plant root

    penetration, ease of cultivation.

Element 2

Describe the soil water properties of soil.

Performance criteria

    2.1 Soil water is defined in terms of levels, movement, and retention characteristics

    and factors.

    2.2 Soil water is described in terms of saturation, field capacity, easily available

    water, and permanent wilting point.

    2.3 Excess and insufficient water effects are outlined in terms of soil properties and

    plant growth.

Element 3

Describe the chemical properties of soils.

Performance criteria

    3.1 Soil pH is outlined in terms of its range and effect on nutrient availability, soil

    structure and organisms, and plant growth tolerances.

     ; New Zealand Qualifications Authority 2012

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    3.2 The description identifies factors that influence soil nutrient availability.

    Range pH, nitrogen and phosphate fixation, texture, soil organisms,

    mycorrhizal association.

    3.3 Macronutrients and major trace elements are identified by name and chemical

    symbols.

    Range all macronutrients and trace elements significant to one type of

    horticulture production.

    3.4 Common nutrient deficiencies of New Zealand soils are described in terms of

    their symptoms and effects on plant growth.

    Range five elements phosphorus, potassium, sulphur, nitrogen,

    magnesium; and

     three micronutrients.

Element 4

Describe the biological properties of soil.

Performance criteria

    4.1 Humus formation is described in terms of decomposition of organic matter by

    soil organisms and favourable conditions.

    4.2 The influences of organic matter on soil are defined in terms of physical and

    chemical properties.

    Range water and nutrient retention, soil structure, soil organisms, soil

    texture, soil temperature carbon/nitrogen ratios.

    4.3 The functions of soil organisms are outlined in terms of their effects on plant

    growth.

    Range bacteria, fungi, earthworms, soil pests and pathogens.

    4.4 The functions of trichoderma and other beneficial micro organisms on soil

    properties and plant growth is described.

     ; New Zealand Qualifications Authority 2012

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    Element 5

Describe how modifying soil properties can influence plant growth.

Performance criteria

    5.1 Major factors are described in terms of their affect on soil suitability for plant

    growth.

    Range nutrient retention and availability, water holding capacity, drainage,

    organic matter, compaction.

    5.2 Practices used by producers are outlined in terms of maintaining and improving

    soil suitability for plant growth.

    Range select five from conservation and/or minimum tillage,

    conventional tillage, drainage, irrigation, green crops, crop

    residues, liming, fertilising, crop rotations.

    5.3 Management of the soil is described when physical, chemical and biological

    properties are modified.

    5.4 Practices used by producers for the maintenance of sustainable soil

    management are described.

    Range fertiliser usage, erosion control, reducing nutrient leaching,

    contouring, mulching, crop planting, inter planting, riparian planting.

Please note

    Providers must be accredited by the Qualifications Authority, or an inter-institutional body with delegated authority for quality assurance, before they can report credits from assessment against unit standards or deliver courses of study leading to that assessment.

    Industry Training Organisations must be accredited by the Qualifications Authority before they can register credits from assessment against unit standards.

    Accredited providers and Industry Training Organisations assessing against unit standards must engage with the moderation system that applies to those standards.

    Accreditation requirements and an outline of the moderation system that applies to this standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The AMAP also includes useful information about special requirements for organisations wishing to develop education and training programmes, such as minimum qualifications for tutors and assessors, and special resource requirements.

Comments on this unit standard

    Please contact the New Zealand Horticulture Industry Training Organisation via their

     www.hortito.org.nz if you wish to suggest changes to the content of this unit website

    standard.

     ; New Zealand Qualifications Authority 2012

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