Soil surveys in various intensities are carried out for collecting data to prepare land use plans.
Board reconnaissance soil survey
The siting of irrigation project is determined by the availability of suitable lands among other considerations. Board reconnaissance soil surveys carried out by the Land Use Division help locate the most advantageous sites for such scheme. These surveys also provide information on the sustainability of lands for other uses like non-irrigated agriculture, forestry, wild-life, recreations and urban use.
Detailed soil survey –Low intensity
Preliminary feasibility investigations are normally done on based on the results of detailed reconnaissance soil survey (Detailed soil survey –Low intensity) done by this division. The costs of development are affected by land and soil characteristics that determine the method of irrigation to be used, the cost of land preparation and need for special measures like surface drainage.
Detailed soil survey- Medium and High intensity
The selection of lands for irrigation and detailed layout planning are carried out using detailed medium intensity or detailed high intensity soil and land classification surveys conducted by the Land Use division. Surveys of this level of detail are also useful for settlement planning, detailed land use planning, laying out of research trials etc..,
The Land suitability maps
The preparation of land suitability maps for different purposes based on interpretation of soils, climate and other land features in another aspect of the work of this Division. These land suitability maps are prepared not only for agricultural purposes but also non agricultural uses like forestry, engineering uses (roads, buildings, waste disposal, and pipelines), tourism, recreations, wildlife etc.
The hazards of salinity and alkalinity
The hazard of salinity and alkalinity need to be carefully evaluated in any irrigation scheme. Predicting and monitoring conditions in various major schemes constitutes another major area of investigations of this Division. Toxicities other than those due to exclusive built have also set to be studied.
Mapping Existing Land Use
Maps of the existing land use are essential in order to assess land development cost and plan settlement in new schemes and to determine encroachments in existing schemes. Land use maps are also very valuable for economic assessment and general planning. Mapping of existing land use, therefore, constitutes a regular activity of the Land Use Division.
Laboratory analytical works
The tests are carried out,
On soil samples
- PH 1:1 H2O,
- Electrical Conductivity 1: 5 H2O
- PH Saturated Paste
- Electrical Conductivity Saturated paste
- Total Exchangeable Bases
- Base Saturation
- Exchangeable Cations
- Exchangeable Acidity
- Organic Carbon
- Total Nitrogen
- Particle size Distribution
On water Samples
- PH , EC, Co3 2- ,HCo3- ,Cl - , So4 2-, No3-, Ca2+,Mg 2+,Na+,K+