2. Lecture content
Land evaluation procedure
Land capability classification
Land productivity index
3. 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.
6. There are eight capability classes
Class 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)
7.
8. Land Productivity Index (LPI)= A*B*C*X*Y
Where 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
9. 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 Definition
Class 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.
10.
11.
12. 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
13. 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.
14. (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.
19. Land
Evaluation
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
20. Student tasks
Topic: 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/
