CONCEPT AND APPROACHES OF LAND EVALUATION

Behzod AbdullobekovTajik Agrarian UniversityAugust 16, 2012, Hungary

Lecture content

Land evaluation procedure

Land capability classification

Land productivity index

Land evaluation is aimed at assessment of land performance and its production potential for a specific purpose.

Land evaluation is only part of the process of land use planning.

The function of land use planning is to guide decisions on land use in such a way that the resources of the environment are put to the most beneficial use for man, whilst at the same time conserving those resources for the future.

What is land evaluation?

Land Evaluation Structurematch

Land-useplanning

policies & plans

Landqualities

Land-use requirements

suitability

Land Capability ClassificationSoil and Land Irrigability Classification Parametric methods

Land Productivity Index Soil Productivity Index

Land Evaluation Methods

There are eight capability classesClass I to class IV : Arable land (suitable for cultivation) Class V to class VIII: Non-arable land (unsuitable for cultivation)

The subclass are based on kinds of dominant limitation such as wetness or excess water (w), Climates (c) and erosion (e)

LAND CAPABILITY CLASSIFICATION

Land Capability Classes

Land Productivity Index (LPI)= A*B*C*X*YWhere factors are decimal equivalents of percentage

ratings. A = General characteristics of soil profile B =Texture of the surface soil C = Slope of the land X = Miscellaneous factors; reaction of surface

soil, fertility, erosion Y = Average annual rainfall

Land Productivity Index (Stories Index)

LAND IRRIGABILITY CLASSES The suitability of land for irrigation depends on physical factors like

quality and quantity of irrigation water and socio-economic factors like land development costs provision of drainage facilities production costs of individual crops.

Class DefinitionClass 1 Lands that have few limitations of soils, topography

or drainage for sustained use under irrigation.  Class 2 Lands that have moderate limitations of soil, topography or drainage for sustained use under irrigation. Class 3 Lands that have severe limitations of soil, topography or drainage for sustained use under irrigation.  Class 4 Lands that are marginal for sustained use under irrigation because of very severe limitations of either soil topography or drainage. Class 5 Lands that are temporarily classed as not suitable for sustained

use under irrigation. Class 6 Lands not suitable for sustained use under irrigation.

LAND IRRIGABILITY ADMINISTRATIVE DIVISION

Selected project districts represent both Kurgan-Tyube and Kulyab Cadastre zones

FAO Framework of Land Evaluation

In the FAO land evaluation procedure, land qualities/land characteristics of each land unit are compared with land use requirements (LURs) to obtain an overall suitability assessment of the land unit for each of land utilization types (LUTs)

FAO Framework classification describe the suitability of an evaluation unit for a land use in four categories,

- Order- Class- Sub-class - Unit

Framework of Land Evaluation Assess land suitability based on: the requirements of specific land uses a comparative analysis of inputs vs. benefits: multi-disciplinary the physical, economic and social context potential environmental impacts & sustainability

Local to global scales, highly populated to undeveloped areas, qualitative vs. quantitative.

(1) Suitability orders All land is divided into two suitability orders, according to whether the land is suitable or not for a given LUT. 'S' = suitable, 'N' = not suitable, for the land use. (2) Suitability classes These are divisions of suitability orders that indicate the degree of suitability, not simply suitable vs. not suitable. 'S1' = suitable, 'S2' = moderately suitable, 'S3' = marginally suitable, 'N1' unsuitable for economic reasons but otherwise marginally suitable, 'N2' = unsuitable for physical reasons. N3 implies limitations that are not correctable at any cost within the context of the land utilization type.

Land Capability Dangara District

Suitability for rice Khatlon region

Vose district

Temurmalik

Shurobod

Cadastral boundary

Land evaluation: conceptual steps

Final Suitability

Assessment

Landqualities

Land-use requireme

nt

Interim SuitabilityAssessment

Consultation

Interimmatch

LUT Land mapping Unit

classification system

• land improvements• environmental impacts• Social and economic analyses

• Objectives• Assumptions• LU options

Land Evaluation applications

LandEvaluation

Population supporting capacity

Agricultural development planning

Land degradation risk assessment

Agricultural inputs recommendations

Irrigation suitability assessment

Livestock forage balance assessmentAgricultural technology transfer

Environmental impact assessment

Student tasksTopic: To do restorative plan the land cadastre map

Practices material :Old cadastre map of Khatlon region.Check the accuracy of updating

Report of procedure

Reference/

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