The project

Soil Sampling and Testing for Nyakasenyi Small Scale Irrigation Scheme in Ntoroko District

The services

Desk study

Site Reconnaissance

Subsurface Investigation

Sample Recovery

Laboratory Testing

Report writing

The client

Ministry of Water and Environment Water for Production Regional Centre – West

The challenge

Water for Production Regional Centre West planned to design and construct Nyakasenyi Valley tank in Ntoroko District and the center therefore intended to carry out soil sampling and testing to discover the available nutrients in the soil and also enable the agronomists make informed decisions on different agronomic practices. SADRiNE Consulting Group Limited was contracted by the Ministry of Water and Environment/ Water for Production Regional Centre – West to carry out soil sampling and testing to discover the available nutrients in the soil. The main objective of this study was to characterize the physical and chemical properties of the soils at the proposed valley tank site and the surrounding areas in Kyabukunguru village, Kyabukunguru parish, Butungama sub-county in Ntoroko district and evaluate the land for irrigation development. Specific objectives were to;

  • Record each pit/profile location with a GPS device and photograph each location and record any visual observations;
  • Identify the soil horizons at each location and the depth and physical condition of the top soil layer, describe and classify;
  • Obtain soil samples from the exposed profiles for laboratory analysis, typically consisting of one bulk sample from each inspection pit/profile, but may include additional samples from each pit if judged necessary due to obvious changes in characteristics or signs of contamination within the exposed profile, as required;
  • Send the soil samples to National Agricultural Research Laboratories for testing and assessing fertility.
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The services

Desk study

We reviewed various documents including verification of the topography, land cover etc., from the topographic map of 1:50:000, previous soils map by FAO 1956, collected and analyzed climate data, and finally collected field equipment like color, charts, sample rings, sample bags, etc., followed by biased sampling strategies to set the profile pits on potential identified soil units,

Site Reconnaissance

We performed a site reconnaissance to review general site characteristics such as location, profile number, elevation, authors, map sheet number, weather information, topography, slope, micro relief, rock outcrops, soil drainage class, human influence, vegetation, land use etc. The locations at which the profile pits were dug were also predetermined during the reconnaissance survey,

Subsurface Investigation

Six (6) pits were dug by peak axe up to the depths between 0.8 – 1m and the GPS points for each pit were recorded and used during the verification of the soil map,

Sample Recovery

Disturbed and undisturbed soils samples from different profile horizons were taken in order to better understand the soil fertility and soil physical properties.

Laboratory Testing

Soil analyses were performed at Makerere University Agricultural Laboratories. Tests included; Soil PH, Soil Organic matter, total nitrogen, available phosphorus, exchangeable calcium and magnesium, exchangeable potassium, exchangeable sodium, Cation exchange capacity and soil texture.

Report writing

We compiled a soils survey report including soil types observed, the general characteristics of major soils at the site, soil physical and chemical properties analyses made on the laboratory tests and recommendations.

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