22175 Demonstrate knowledge of soil properties and their effect on

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Demonstrate knowledge of soil properties and their effect on plant growth
Level Credits Purpose 3 10 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. Horticulture Production Horticulture Registered 25 July 2006 25 July 2006 31 December 2011 Open. This unit standard and unit standard 22174 replaced unit standard 14, unit standard 33, unit standard 34, and unit standard 35. Evaluation of documentation and visit by NZQA, industry and teaching professional in the same field from another provider. New Zealand Horticulture Industry Training Organisation 0032

Subfield Domain Status Status date Date version published Planned review date Entry information Replacement information

Accreditation

Standard setting body (SSB)

Accreditation and Moderation Action Plan (AMAP) reference

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 2010

22175 version 1 Page 2 of 4

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. Soil water is described in terms of saturation, field capacity, easily available water, and permanent wilting point. Excess and insufficient water effects are outlined in terms of soil properties and plant growth.

2.2

2.3

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 2010

22175 version 1 Page 3 of 4 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. 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.

4.2

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 2010

22175 version 1 Page 4 of 4 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. 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.

5.4

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

 New Zealand Qualifications Authority 2010


				
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